hbase/CHANGES.txt

HBase Change Log
Release 0.21.0 - Unreleased
  INCOMPATIBLE CHANGES
   HBASE-1822  Remove the deprecated APIs
   HBASE-1848  Fixup shell for HBASE-1822
   HBASE-1854  Remove the Region Historian
   HBASE-1930  Put.setTimeStamp misleading (doesn't change timestamp on
               existing KeyValues, not copied in copy constructor)
               (Dave Latham via Stack)
   HBASE-1360  move up to Thrift 0.2.0 (Kay Kay and Lars Francke via Stack)
   HBASE-2212  Refactor out lucene dependencies from HBase
               (Kay Kay via Stack)
   HBASE-2219  stop using code mapping for method names in the RPC
   HBASE-1728  Column family scoping and cluster identification
   HBASE-2099  Move build to Maven (Paul Smith via Stack)
   HBASE-2260  Remove all traces of Ant and Ivy (Lars Francke via Stack)
   HBASE-2255  take trunk back to hadoop 0.20
   HBASE-2378  Bulk insert with multiple reducers broken due to improper
               ImmutableBytesWritable comparator (Todd Lipcon via Stack)
   HBASE-2392  Upgrade to ZooKeeper 3.3.0
   HBASE-2294  Enumerate ACID properties of HBase in a well defined spec
               (Todd Lipcon via Stack)
   HBASE-2541  Remove transactional contrib (Clint Morgan via Stack)

  BUG FIXES
   HBASE-1791  Timeout in IndexRecordWriter (Bradford Stephens via Andrew
               Purtell)
   HBASE-1737  Regions unbalanced when adding new node (recommit)
   HBASE-1792  [Regression] Cannot save timestamp in the future
   HBASE-1793  [Regression] HTable.get/getRow with a ts is broken
   HBASE-1698  Review documentation for o.a.h.h.mapreduce
   HBASE-1798  [Regression] Unable to delete a row in the future
   HBASE-1790  filters are not working correctly (HBASE-1710 HBASE-1807 too)
   HBASE-1779  ThriftServer logged error if getVer() result is empty
   HBASE-1778  Improve PerformanceEvaluation (Schubert Zhang via Stack)
   HBASE-1751  Fix KeyValue javadoc on getValue for client-side
   HBASE-1795  log recovery doesnt reset the max sequence id, new logfiles can
               get tossed as 'duplicates'
   HBASE-1794  recovered log files are not inserted into the storefile map
   HBASE-1824  [stargate] default timestamp should be LATEST_TIMESTAMP
   HBASE-1740  ICV has a subtle race condition only visible under high load
   HBASE-1808  [stargate] fix how columns are specified for scanners
   HBASE-1828  CompareFilters are broken from client-side
   HBASE-1836  test of indexed hbase broken
   HBASE-1838  [javadoc] Add javadoc to Delete explaining behavior when no
               timestamp provided
   HBASE-1821  Filtering by SingleColumnValueFilter bug
   HBASE-1840  RowLock fails when used with IndexTable
               (Keith Thomas via Stack)
   HBASE-818   HFile code review and refinement (Schubert Zhang via Stack)
   HBASE-1830  HbaseObjectWritable methods should allow null HBCs
               for when Writable is not Configurable (Stack via jgray)
   HBASE-1847  Delete latest of a null qualifier when non-null qualifiers
               exist throws a RuntimeException 
   HBASE-1850  src/examples/mapred do not compile after HBASE-1822
   HBASE-1853  Each time around the regionserver core loop, we clear the
               messages to pass master, even if we failed to deliver them
   HBASE-1815  HBaseClient can get stuck in an infinite loop while attempting
               to contact a failed regionserver
   HBASE-1856  HBASE-1765 broke MapReduce when using Result.list()
               (Lars George via Stack)
   HBASE-1857  WrongRegionException when setting region online after .META.
               split (Cosmin Lehane via Stack)
   HBASE-1809  NPE thrown in BoundedRangeFileInputStream
   HBASE-1859  Misc shell fixes patch (Kyle Oba via Stack)
   HBASE-1865  0.20.0 TableInputFormatBase NPE
   HBASE-1866  Scan(Scan) copy constructor does not copy value of
               cacheBlocks
   HBASE-1869  IndexedTable delete fails when used in conjunction with
               RowLock (Keith Thomas via Stack)
   HBASE-1858  Master can't split logs created by THBase (Clint Morgan via
               Andrew Purtell)
   HBASE-1871  Wrong type used in TableMapReduceUtil.initTableReduceJob()
               (Lars George via Stack)
   HBASE-1883  HRegion passes the wrong minSequenceNumber to
               doReconstructionLog (Clint Morgan via Stack)
   HBASE-1878  BaseScanner results can't be trusted at all (Related to
               hbase-1784)
   HBASE-1831  Scanning API must be reworked to allow for fully functional
               Filters client-side
   HBASE-1890  hbase-1506 where assignment is done at regionserver doesn't
               work
   HBASE-1889  ClassNotFoundException on trunk for REST
   HBASE-1905  Remove unused config. hbase.hstore.blockCache.blockSize
   HBASE-1906  FilterList of prefix and columnvalue not working properly with
               deletes and multiple values
   HBASE-1896  WhileMatchFilter.reset should call encapsulated filter reset
   HBASE-1912  When adding a secondary index to an existing table, it will
               cause NPE during re-indexing (Mingjui Ray Liao via Andrew
               Purtell)
   HBASE-1916  FindBugs and javac warnings cleanup
   HBASE-1908  ROOT not reassigned if only one regionserver left
   HBASE-1915  HLog.sync is called way too often, needs to be only called one
               time per RPC
   HBASE-1777  column length is not checked before saved to memstore
   HBASE-1925  IllegalAccessError: Has not been initialized (getMaxSequenceId)
   HBASE-1929  If hbase-default.xml is not in CP, zk session timeout is 10
               seconds!
   HBASE-1927  Scanners not closed properly in certain circumstances
   HBASE-1934  NullPointerException in ClientScanner (Andrew Purtell via Stack)
   HBASE-1946  Unhandled exception at regionserver (Dmitriy Lyfar via Stack)
   HBASE-1682  IndexedRegion does not properly handle deletes
               (Andrew McCall via Clint Morgan and Stack)
   HBASE-1953  Overhaul of overview.html (html fixes, typos, consistency) -
               no content changes (Lars Francke via Stack)
   HBASE-1954  Transactional scans do not see newest put (Clint Morgan via
               Stack)
   HBASE-1919  code: HRS.delete seems to ignore exceptions it shouldnt
   HBASE-1951  Stack overflow when calling HTable.checkAndPut() 
               when deleting a lot of values
   HBASE-1781  Weird behavior of WildcardColumnTracker.checkColumn(), 
               looks like recursive loop
   HBASE-1949  KeyValue expiration by Time-to-Live during major compaction is
               broken (Gary Helmling via Stack)
   HBASE-1957  Get-s can't set a Filter
   HBASE-1928  ROOT and META tables stay in transition state (making the system
               not usable) if the designated regionServer dies before the
               assignment is complete (Yannis Pavlidis via Stack)
   HBASE-1962  Bulk loading script makes regions incorrectly (loadtable.rb)
   HBASE-1966  Apply the fix from site/ to remove the forrest dependency on
               Java 5
   HBASE-1967  [Transactional] client.TestTransactions.testPutPutScan fails
               sometimes -- Temporary fix
   HBASE-1841  If multiple of same key in an hfile and they span blocks, may
               miss the earlier keys on a lookup
               (Schubert Zhang via Stack)
   HBASE-1977  Add ts and allow setting VERSIONS when scanning in shell
   HBASE-1979  MurmurHash does not yield the same results as the reference C++
               implementation when size % 4 >= 2 (Olivier Gillet via Andrew
               Purtell)
   HBASE-1999  When HTable goes away, close zk session in shutdown hook or
               something...
   HBASE-1997  zk tick time bounds maximum zk session time
   HBASE-2003  [shell] deleteall ignores column if specified
   HBASE-2018  Updates to .META. blocked under high MemStore load
   HBASE-1994  Master will lose hlog entries while splitting if region has
               empty oldlogfile.log (Lars George via Stack)
   HBASE-2022  NPE in housekeeping kills RS
   HBASE-2034  [Bulk load tools] loadtable.rb calls an undefined method
               'descendingIterator' (Ching-Shen Chen via Stack)
   HBASE-2033  Shell scan 'limit' is off by one
   HBASE-2040  Fixes to group commit
   HBASE-2047  Example command in the "Getting Started" 
               documentation doesn't work (Benoit Sigoure via JD)
   HBASE-2048  Small inconsistency in the "Example API Usage"
               (Benoit Sigoure via JD)
   HBASE-2044  HBASE-1822 removed not-deprecated APIs
   HBASE-1960  Master should wait for DFS to come up when creating
               hbase.version
   HBASE-2054  memstore size 0 is >= than blocking -2.0g size
   HBASE-2064  Cannot disable a table if at the same the Master is moving 
               its regions around
   HBASE-2065  Cannot disable a table if any of its region is opening 
               at the same time
   HBASE-2026  NPE in StoreScanner on compaction
   HBASE-2072  fs.automatic.close isn't passed to FileSystem
   HBASE-2075  Master requires HDFS superuser privileges due to waitOnSafeMode
   HBASE-2077  NullPointerException with an open scanner that expired causing 
               an immediate region server shutdown (Sam Pullara via JD)
   HBASE-2078  Add JMX settings as commented out lines to hbase-env.sh
               (Lars George via JD)
   HBASE-2082  TableInputFormat is ignoring input scan's stop row setting
               (Scott Wang via Andrew Purtell)
   HBASE-2068  MetricsRate is missing "registry" parameter
               (Lars George and Gary Helmling via Stack)
   HBASE-2093  [stargate] RowSpec parse bug
   HBASE-2114  Can't start HBase in trunk (JD and Kay Kay via JD)
   HBASE-2115  ./hbase shell would not launch due to missing jruby dependency
               (Kay Kay via JD)
   HBASE-2101  KeyValueSortReducer collapses all values to last passed
   HBASE-2119  Fix top-level NOTICES.txt file. Its stale.
   HBASE-2120  [stargate] Unable to delete column families (Greg Lu via Andrew
               Purtell)
   HBASE-2123  Remove 'master' command-line option from PE
   HBASE-2024  [stargate] Deletes not working as expected (Greg Lu via Andrew
               Purtell)
   HBASE-2122  [stargate] Initializing scanner column families doesn't work
               (Greg Lu via Andrew Purtell)
   HBASE-2124  Useless exception in HMaster on startup
   HBASE-2127  randomWrite mode of PerformanceEvaluation benchmark program
               writes only to a small range of keys (Kannan Muthukkaruppan
               via Stack)
   HBASE-2126  Fix build break - ec2 (Kay Kay via JD)
   HBASE-2134  Ivy nit regarding checking with latest snapshots (Kay Kay via
               Andrew Purtell)
   HBASE-2138  unknown metrics type (Stack via JD)
   HBASE-2137  javadoc warnings from 'javadoc' target (Kay Kay via Stack)
   HBASE-2135  ant javadoc complains about missing classe (Kay Kay via Stack)
   HBASE-2130  bin/* scripts - not to include lib/test/**/*.jar
               (Kay Kay via Stack)
   HBASE-2140  findbugs issues - 2 performance warnings as suggested by
               findbugs (Kay Kay via Stack)
   HBASE-2139  findbugs task in build.xml (Kay Kay via Stack)
   HBASE-2147  run zookeeper in the same jvm as master during non-distributed
               mode
   HBASE-65    Thrift Server should have an option to bind to ip address
               (Lars Francke via Stack)
   HBASE-2146  RPC related metrics are missing in 0.20.3 since recent changes
               (Gary Helmling via Lars George)
   HBASE-2150  Deprecated HBC(Configuration) constructor doesn't call this()
   HBASE-2154  Fix Client#next(int) javadoc
   HBASE-2152  Add default jmxremote.{access|password} files into conf
               (Lars George and Gary Helmling via Stack)
   HBASE-2156  HBASE-2037 broke Scan - only a test for trunk
   HBASE-2057  Cluster won't stop (Gary Helmling and JD via JD)
   HBASE-2160  Can't put with ts in shell
   HBASE-2144  Now does \x20 for spaces
   HBASE-2163  ZK dependencies - explicitly add them until ZK artifacts are
               published to mvn repository (Kay Kay via Stack)
   HBASE-2164  Ivy nit - clean up configs (Kay Kay via Stack)
   HBASE-2184  Calling HTable.getTableDescriptor().* on a full cluster takes
               a long time (Cristian Ivascu via Stack)
   HBASE-2193  Better readability of - hbase.regionserver.lease.period
               (Kay Kay via Stack)
   HBASE-2199  hbase.client.tableindexed.IndexSpecification, lines 72-73
               should be reversed (Adrian Popescu via Stack)
   HBASE-2224  Broken build: TestGetRowVersions.testGetRowMultipleVersions
   HBASE-2129  ant tar build broken since switch to Ivy (Kay Kay via Stack)
   HBASE-2226  HQuorumPeerTest doesnt run because it doesnt start with the
               word Test
   HBASE-2230  SingleColumnValueFilter has an ungaurded debug log message
   HBASE-2258  The WhileMatchFilter doesn't delegate the call to filterRow()
   HBASE-2259  StackOverflow in ExplicitColumnTracker when row has many columns
   HBASE-2268  [stargate] Failed tests and DEBUG output is dumped to console
               since move to Mavenized build 
   HBASE-2276  Hbase Shell hcd() method is broken by the replication scope 
               parameter (Alexey Kovyrin via Lars George)
   HBASE-2244  META gets inconsistent in a number of crash scenarios
   HBASE-2284  fsWriteLatency metric may be incorrectly reported 
               (Kannan Muthukkaruppan via Stack)
   HBASE-2063  For hfileoutputformat, on timeout/failure/kill clean up
               half-written hfile (Ruslan Salyakhov via Stack)
   HBASE-2281  Hbase shell does not work when started from the build dir
               (Alexey Kovyrin via Stack)
   HBASE-2293  CME in RegionManager#isMetaServer
   HBASE-2261  The javadoc in WhileMatchFilter and it's tests in TestFilter
               are not accurate/wrong
   HBASE-2299  [EC2] mapreduce fixups for PE
   HBASE-2295  Row locks may deadlock with themselves
               (dhruba borthakur via Stack)
   HBASE-2308  Fix the bin/rename_table.rb script, make it work again
   HBASE-2307  hbase-2295 changed hregion size, testheapsize broke... fix it
   HBASE-2269  PerformanceEvaluation "--nomapred" may assign duplicate random
               seed over multiple testing threads (Tatsuya Kawano via Stack) 
   HBASE-2287  TypeError in shell (Alexey Kovyrin via Stack)
   HBASE-2023  Client sync block can cause 1 thread of a multi-threaded client
               to block all others (Karthik Ranganathan via Stack)
   HBASE-2305  Client port for ZK has no default (Suraj Varma via Stack)
   HBASE-2323  filter.RegexStringComparator does not work with certain bytes
               (Benoit Sigoure via Stack)
   HBASE-2313  Nit-pick about hbase-2279 shell fixup, if you do get with
               non-existant column family, throws lots of exceptions
               (Alexey Kovyrin via Stack)
   HBASE-2334  Slimming of Maven dependency tree - improves assembly build
               speed (Paul Smith via Stack)
   HBASE-2336  Fix build broken with HBASE-2334 (Lars Francke via Lars George)
   HBASE-2283  row level atomicity (Kannan Muthukkaruppan via Stack)
   HBASE-2355  Unsynchronized logWriters map is mutated from several threads in
               HLog splitting (Todd Lipcon via Andrew Purtell)
   HBASE-2358  Store doReconstructionLog will fail if oldlogfile.log is empty
               and won't load region (Cosmin Lehene via Stack)
   HBASE-2370  saveVersion.sh doesnt properly grab the git revision
   HBASE-2373  Remove confusing log message of how "BaseScanner GET got
               different address/startcode than SCAN"
   HBASE-2361  WALEdit broke replication scope
   HBASE-2365  Double-assignment around split
   HBASE-2398  NPE in HLog.append when calling writer.getLength
               (Kannan Muthukkaruppan via Stack)
   HBASE-2410  spurious warnings from util.Sleeper
   HBASE-2335  mapred package docs don't say zookeeper jar is a dependent
   HBASE-2417  HCM.locateRootRegion fails hard on "Connection refused"
   HBASE-2346  Usage of FilterList slows down scans
   HBASE-2341  ZK settings for initLimit/syncLimit should not have been removed
               from hbase-default.xml
   HBASE-2439  HBase can get stuck if updates to META are blocked
               (Kannan Muthukkaruppan via Stack)
   HBASE-2451  .META. by-passes cache; BLOCKCACHE=>'false'
   HBASE-2453  Revisit compaction policies after HBASE-2248 commit
               (Jonathan Gray via Stack)
   HBASE-2458  Client stuck in TreeMap,remove (Todd Lipcon via Stack)
   HBASE-2460  add_table.rb deletes any tables for which the target table name
               is a prefix (Todd Lipcon via Stack)
   HBASE-2463  Various Bytes.* functions silently ignore invalid arguments
               (Benoit Sigoure via Stack)
   HBASE-2443  IPC client can throw NPE if socket creation fails
               (Todd Lipcon via Stack)
   HBASE-2447  LogSyncer.addToSyncQueue doesn't check if syncer is still
               running before waiting (Todd Lipcon via Stack)
   HBASE-2494  Does not apply new.name parameter to CopyTable
               (Yoonsik Oh via Stack)
   HBASE-2481  Client is not getting UnknownScannerExceptions; they are
               being eaten (Jean-Daniel Cryans via Stack)
   HBASE-2448  Scanner threads are interrupted without acquiring lock properly
               (Todd Lipcon via Stack)
   HBASE-2491  master.jsp uses absolute links to table.jsp. This broke when
               master.jsp moved under webapps/master(Cristian Ivascu via Stack)
   HBASE-2487  Uncaught exceptions in receiving IPC responses orphan clients
               (Todd Lipcon via Stack)
   HBASE-2497  ProcessServerShutdown throws NullPointerException for offline
               regiond (Miklos Kurucz via Stack)
   HBASE-2499  Race condition when disabling a table leaves regions in transition
   HBASE-2489  Make the "Filesystem needs to be upgraded" error message more
               useful (Benoit Sigoure via Stack)
   HBASE-2482  regions in transition do not get reassigned by master when RS
               crashes (Todd Lipcon via Stack)
   HBASE-2513  hbase-2414 added bug where we'd tight-loop if no root available
   HBASE-2503  PriorityQueue isn't thread safe, KeyValueHeap uses it that way
   HBASE-2431  Master does not respect generation stamps, may result in meta
               getting permanently offlined
   HBASE-2515  ChangeTableState considers split&&offline regions as being served
   HBASE-2544  Forward port branch 0.20 WAL to TRUNK
   HBASE-2546  Specify default filesystem in both the new and old way (needed
               if we are to run on 0.20 and 0.21 hadoop)
   HBASE-1895  HConstants.MAX_ROW_LENGTH is incorrectly 64k, should be 32k      
   HBASE-1968  Give clients access to the write buffer      
   HBASE-2028  Add HTable.incrementColumnValue support to shell
               (Lars George via Andrew Purtell)  
   HBASE-2138  unknown metrics type
   HBASE-2551  Forward port fixes that are in branch but not in trunk (part of
               the merge of old 0.20 into TRUNK task) -- part 1.

  IMPROVEMENTS
   HBASE-1760  Cleanup TODOs in HTable
   HBASE-1759  Ability to specify scanner caching on a per-scan basis
               (Ken Weiner via jgray)
   HBASE-1763  Put writeToWAL methods do not have proper getter/setter names
               (second commit to fix compile error in hregion)
   HBASE-1770  HTable.setWriteBufferSize does not flush the writeBuffer when
               its size is set to a value lower than its current size.
               (Mathias via jgray)
   HBASE-1771  PE sequentialWrite is 7x slower because of
               MemStoreFlusher#checkStoreFileCount
   HBASE-1758  Extract interface out of HTable (Vaibhav Puranik via Andrew
               Purtell)
   HBASE-1776  Make rowcounter enum public
   HBASE-1276  [testing] Upgrade to JUnit 4.x and use @BeforeClass
               annotations to optimize tests
   HBASE-1800  Too many ZK connections
   HBASE-1819  Update to 0.20.1 hadoop and zk 3.2.1
   HBASE-1820  Update jruby from 1.2 to 1.3.1
   HBASE-1687  bin/hbase script doesn't allow for different memory settings
               for each daemon type
   HBASE-1823  Ability for Scanners to bypass the block cache
   HBASE-1827  Add disabling block cache scanner flag to the shell
   HBASE-1835  Add more delete tests
   HBASE-1574  Client and server APIs to do batch deletes
   HBASE-1833  hfile.main fixes
   HBASE-1684  Backup (Export/Import) contrib tool for 0.20
   HBASE-1860  Change HTablePool#createHTable from private to protected
   HBASE-48    Bulk load tools
   HBASE-1855  HMaster web application doesn't show the region end key in the
               table detail page (Andrei Dragomir via Stack)
   HBASE-1870  Bytes.toFloat(byte[], int) is marked private
   HBASE-1874  Client Scanner mechanism that is used for HbaseAdmin methods
               (listTables, tableExists), is very slow if the client is far
               away from the HBase cluster (Andrei Dragomir via Stack)
   HBASE-1879  ReadOnly transactions generate WAL activity (Clint Morgan via
               Stack)
   HBASE-1875  Compression test utility
   HBASE-1832  Faster enable/disable/delete
   HBASE-1481  Add fast row key only scanning
   HBASE-1506  [performance] Make splits faster
   HBASE-1722  Add support for exporting HBase metrics via JMX
               (Gary Helming via Stack)
   HBASE-1899  Use scanner caching in shell count
   HBASE-1887  Update hbase trunk to latests on hadoop 0.21 branch so we can
               all test sync/append
   HBASE-1902  Let PerformanceEvaluation support setting tableName and compress
               algorithm (Schubert Zhang via Stack)
   HBASE-1885  Simplify use of IndexedTable outside Java API
               (Kevin Patterson via Stack)
   HBASE-1903  Enable DEBUG by default
   HBASE-1907  Version all client writables
   HBASE-1914  hlog should be able to set replication level for the log
               indendently from any other files
   HBASE-1537  Intra-row scanning
   HBASE-1918  Don't do DNS resolving in .META. scanner for each row
   HBASE-1756  Refactor HLog (changing package first)
   HBASE-1926  Remove unused xmlenc jar from trunk
   HBASE-1936  HLog group commit
   HBASE-1921  When the Master's session times out and there's only one,
               cluster is wedged
   HBASE-1942  Update hadoop jars in trunk; update to r831142
   HBASE-1943  Remove AgileJSON; unused
   HBASE-1944  Add a "deferred log flush" attribute to HTD
   HBASE-1945  Remove META and ROOT memcache size bandaid 
   HBASE-1947  If HBase starts/stops often in less than 24 hours, 
               you end up with lots of store files
   HBASE-1829  Make use of start/stop row in TableInputFormat
               (Lars George via Stack)
   HBASE-1867  Tool to regenerate an hbase table from the data files
   HBASE-1904  Add tutorial for installing HBase on Windows using Cygwin as
               a test and development environment (Wim Van Leuven via Stack)
   HBASE-1963  Output to multiple tables from Hadoop MR without use of HTable
               (Kevin Peterson via Andrew Purtell)
   HBASE-1975  SingleColumnValueFilter: Add ability to match the value of
               previous versions of the specified column
               (Jeremiah Jacquet via Stack)
   HBASE-1971  Unit test the full WAL replay cycle
   HBASE-1970  Export does one version only; make it configurable how many
               it does
   HBASE-1987  The Put object has no simple read methods for checking what
               has already been added (Ryan Smith via Stack)
   HBASE-1985  change HTable.delete(ArrayList) to HTable.delete(List)
   HBASE-1958  Remove "# TODO: PUT BACK !!! "${HADOOP_HOME}"/bin/hadoop
               dfsadmin -safemode wait"
   HBASE-2011  Add zktop like output to HBase's master UI (Lars George via
               Andrew Purtell)
   HBASE-1995  Add configurable max value size check (Lars George via Andrew
               Purtell)
   HBASE-2017  Set configurable max value size check to 10MB
   HBASE-2029  Reduce shell exception dump on console
               (Lars George and J-D via Stack)
   HBASE-2027  HConnectionManager.HBASE_INSTANCES leaks TableServers
               (Dave Latham via Stack)
   HBASE-2013  Add useful helpers to HBaseTestingUtility.java (Lars George
               via J-D)
   HBASE-2031  When starting HQuorumPeer, try to match on more than 1 address
   HBASE-2043  Shell's scan broken
   HBASE-2044  HBASE-1822 removed not-deprecated APIs
   HBASE-2049  Cleanup HLog binary log output (Dave Latham via Stack)
   HBASE-2052  Make hbase more 'live' when comes to noticing table creation,
               splits, etc., for 0.20.3
   HBASE-2059  Break out WAL reader and writer impl from HLog
   HBASE-2060  Missing closing tag in mapreduce package info (Lars George via
               Andrew Purtell)
   HBASE-2028  Add HTable.incrementColumnValue support to shell (Lars George
               via Andrew Purtell)
   HBASE-2062  Metrics documentation outdated (Lars George via JD)
   HBASE-2045  Update trunk and branch zk to just-release 3.2.2.
   HBASE-2074  Improvements to the hadoop-config script (Bassam Tabbara via
               Stack)
   HBASE-2076  Many javadoc warnings
   HBASE-2068  MetricsRate is missing "registry" parameter (Lars George via JD)
   HBASE-2025  0.20.2 accessed from older client throws 
               UndeclaredThrowableException; frustrates rolling upgrade
   HBASE-2081  Set the retries higher in shell since client pause is lower
   HBASE-1956  Export HDFS read and write latency as a metric
   HBASE-2036  Use Configuration instead of HBaseConfiguration (Enis Soztutar
               via Stack)
   HBASE-2085  StringBuffer -> StringBuilder - conversion of references as
               necessary (Kay Kay via Stack)
   HBASE-2052  Upper bound of outstanding WALs can be overrun
   HBASE-2086  Job(configuration,String) deprecated (Kay Kay via Stack)
   HBASE-1996  Configure scanner buffer in bytes instead of number of rows
               (Erik Rozendaal and Dave Latham via Stack)
   HBASE-2090  findbugs issues (Kay Kay via Stack)
   HBASE-2089  HBaseConfiguration() ctor. deprecated (Kay Kay via Stack)
   HBASE-2035  Binary values are formatted wrong in shell
   HBASE-2095  TIF shuold support more confs for the scanner (Bassam Tabbara
               via Andrew Purtell)
   HBASE-2107  Upgrading Lucene 2.2 to Lucene 3.0.0 (Kay Kay via Stack)
   HBASE-2111  Move to ivy broke our being able to run in-place; i.e.
               ./bin/start-hbase.sh in a checkout
   HBASE-2136  Forward-port the old mapred package
   HBASE-2133  Increase default number of client handlers
   HBASE-2109  status 'simple' should show total requests per second, also 
   	       the requests/sec is wrong as is
   HBASE-2151  Remove onelab and include generated thrift classes in javadoc
               (Lars Francke via Stack)
   HBASE-2149  hbase.regionserver.global.memstore.lowerLimit is too low
   HBASE-2157  LATEST_TIMESTAMP not replaced by current timestamp in KeyValue
               (bulk loading)
   HBASE-2153  Publish generated HTML documentation for Thrift on the website
               (Lars Francke via Stack)
   HBASE-1373  Update Thrift to use compact/framed protocol (Lars Francke via
               Stack)
   HBASE-2172  Add constructor to Put for row key and timestamp
               (Lars Francke via Stack)
   HBASE-2178  Hooks for replication
   HBASE-2180  Bad random read performance from synchronizing
               hfile.fddatainputstream
   HBASE-2194  HTable - put(Put) , put(List<Put) code duplication (Kay Kay via
               Stack)
   HBASE-2185  Add html version of default hbase-site.xml (Kay Kay via Stack)
   HBASE-2198  SingleColumnValueFilter should be able to find the column value
               even when it's not specifically added as input on the sc
               (Ferdy via Stack)
   HBASE-2189  HCM trashes meta cache even when not needed
   HBASE-2190  HRS should report to master when HMsg are available
   HBASE-2209  Support of List [ ] in HBaseOutputWritable for serialization
               (Kay Kay via Stack)
   HBASE-2177  Add timestamping to gc logging option
   HBASE-2066  Perf: parallelize puts
   HBASE-2222  Improve log "Trying to contact region server Some server for
               region, row 'ip_info_100,,1263329969690', but failed after
               11 attempts".
   HBASE-2220  Add a binary comparator that only compares up to the length
               of the supplied byte array (Bruno Dumon via Stack)
   HBASE-2211  Add a new Filter that checks a single column value but does not
               emit it. (Ferdy via Stack)
   HBASE-2241  Change balancer sloppyness from 0.1 to 0.3
   HBASE-2250  typo in the maven pom
   HBASE-2254  Improvements to the Maven POMs (Lars Francke via Stack)
   HBASE-2262  ZKW.ensureExists should check for existence
   HBASE-2264  Adjust the contrib apps to the Maven project layout 
               (Lars Francke via Lars George)
   HBASE-2245  Unnecessary call to syncWal(region); in HRegionServer 
               (Benoit Sigoure via JD)
   HBASE-2246  Add a getConfiguration method to HTableInterface
               (Benoit Sigoure via JD)
   HBASE-2282  More directories should be ignored when using git for
               development (Alexey Kovyrin via Stack)
   HBASE-2267  More improvements to the Maven build (Lars Francke via Stack)
   HBASE-2174  Stop from resolving HRegionServer addresses to names using DNS
               on every heartbeat (Karthik Ranganathan via Stack) 
   HBASE-2302  Optimize M-R by bulk excluding regions - less InputSplit-s to
               avoid traffic on region servers when performing M-R on a subset
               of the table (Kay Kay via Stack) 
   HBASE-2309  Add apache releases to pom (list of ) repositories
               (Kay Kay via Stack)
   HBASE-2279  Hbase Shell does not have any tests (Alexey Kovyrin via Stack)
   HBASE-2314  [shell] Support for getting counters (Alexey Kovyrin via Stack)
   HBASE-2324  Refactoring of TableRecordReader (mapred / mapreduce) for reuse
               outside the scope of InputSplit / RecordReader (Kay Kay via
               Stack)
   HBASE-2313  Nit-pick about hbase-2279 shell fixup, if you do get with
               non-existant column family, throws lots of exceptions
               (Alexey Kovyrin via Stack)
   HBASE-2331  [shell] count command needs a way to specify scan caching
               (Alexey Kovyrin via Stack)
   HBASE-2364  Ignore Deprecations during build (Paul Smith via Stack)
   HBASE-2338  log recovery: deleted items may be resurrected
               (Aravind Menon via Stack)
   HBASE-2359  WALEdit doesn't implement HeapSize
               (Kannan Muthukkaruppan via Stack)
   HBASE-2348  [stargate] Stargate needs both JAR and WAR artifacts (Paul Smith
               via Andrew Purtell)
   HBASE-2389  HTable - delete / put unnecessary sync (Kay Kay via Stack)
   HBASE-2385  Debug Message "Received report from unknown server" should be
               INFO or WARN
   HBASE-2374  TableInputFormat - Configurable parameter to add column families
               (Kay Kay via Stack)
   HBASE-2388  Give a very explicit message when we figure a big GC pause
   HBASE-2270  Improve how we handle recursive calls in ExplicitColumnTracker 
               and WildcardColumnTracker
   HBASE-2402  [stargate] set maxVersions on gets
   HBASE-2087  The wait on compaction because "Too many store files" 
               holds up all flushing
   HBASE-2252  Mapping a very big table kills region servers
   HBASE-2412  [stargate] PerformanceEvaluation
   HBASE-2419  Remove from RS logs the fat NotServingRegionException stack
   HBASE-2286  [Transactional Contrib] Correctly handle or avoid cases where 
               writes occur in same millisecond (Clint Morgan via J-D)
   HBASE-2360  Make sure we have all the hadoop fixes in our our copy of its rpc
               (Todd Lipcon via Stack)
   HBASE-2423  Update 'Getting Started' for 0.20.4 including making
               "important configurations more visiable"
   HBASE-2435  HTablePool - method to release resources after use
               (Kay Kay via Stack)
   HBASE-1933  Upload Hbase jars to a public maven repository
               (Kay Kay via Stack)
   HBASE-2440  Master UI should check against known bad JDK versions and
               warn the user (Todd Lipcon via Stack)
   HBASE-2430  Disable frag display in trunk, let HBASE-2165 replace it
   HBASE-1892  [performance] make hbase splits run faster
   HBASE-2456  deleteChangedReaderObserver spitting warnings after HBASE-2248
   HBASE-2452  Fix our Maven dependencies (Lars Francke via Stack)
   HBASE-2490  Improve the javadoc of the client API for HTable
               (Benoit Sigoure via Stack)
   HBASE-2488  Master should warn more loudly about unexpected events
               (Todd Lipcon via Stack)
   HBASE-2393  ThriftServer instantiates a new HTable per request
               (Bogdan DRAGU via Stack)
   HBASE-2496  Less ArrayList churn on the scan path
   HBASE-2414  Enhance test suite to be able to specify distributed scenarios
   HBASE-2518  Kill all the trailing whitespaces in the code base
               (Benoit Sigoure via Stack)
   HBASE-2528  ServerManager.ServerMonitor isn't daemonized
   HBASE-2537  Change ordering of maven repos listed in pom.xml to have
               ibiblio first
   HBASE-2540  Make QueryMatcher.MatchCode public (Clint Morgan via Stack)
   HBASE-2524  Unresponsive region server, potential deadlock
               (Todd Lipcon via Stack)
   HBASE-2547  [mvn] assembly:assembly does not include hbase-X.X.X-test.jar
               (Paul Smith via Stack)

  NEW FEATURES
   HBASE-1961  HBase EC2 scripts
   HBASE-1982  [EC2] Handle potentially large and uneven instance startup times
   HBASE-2009  [EC2] Support mapreduce
   HBASE-2012  [EC2] LZO support
   HBASE-2019  [EC2] remember credentials if not configured
   HBASE-2080  [EC2] Support multivolume local instance storage
   HBASE-2083  [EC2] HDFS DataNode no longer required on master
   HBASE-2084  [EC2] JAVA_HOME handling broken
   HBASE-2100  [EC2] Adjust fs.file-max
   HBASE-2103  [EC2] pull version from build
   HBASE-2131  [EC2] Mount data volumes as xfs, noatime
   HBASE-1901  "General" partitioner for "hbase-48" bulk (behind the api, write
               hfiles direct) uploader
   HBASE-1433  Update hbase build to match core, use ivy, publish jars to maven
               repo, etc. (Kay Kay via Stack)
   HBASE-2129  Simple Master/Slave replication
   HBASE-2070  Collect HLogs and delete them after a period of time
   HBASE-2221  MR to copy a table
   HBASE-2257  [stargate] multiuser mode
   HBASE-2263  [stargate] multiuser mode: authenticator for zookeeper
   HBASE-2273  [stargate] export metrics via Hadoop metrics, JMX, and zookeeper
   HBASE-2274  [stargate] filter support: JSON descriptors
   HBASE-2316  Need an ability to run shell tests w/o invoking junit
               (Alexey Kovyrin via Stack)
   HBASE-2327  [EC2] Allocate elastic IP addresses for ZK and master nodes
   HBASE-2319  [stargate] multiuser mode: request shaping
   HBASE-2403  [stargate] client HTable interface to REST connector
   HBASE-2438  Addition of a Column Pagination Filter (Paul Kist via Stack)
   HBASE-2473  Add to admin create table start and end key params and
               desired number of regions

  OPTIMIZATIONS
   HBASE-410   [testing] Speed up the test suite
   HBASE-2041  Change WAL default configuration values


Release 0.20.0 - Tue Sep  8 12:53:05 PDT 2009
  INCOMPATIBLE CHANGES
   HBASE-1147  Modify the scripts to use Zookeeper
   HBASE-1144  Store the ROOT region location in Zookeeper
               (Nitay Joffe via Stack)
   HBASE-1146  Replace the HRS leases with Zookeeper
   HBASE-61    Create an HBase-specific MapFile implementation
               (Ryan Rawson via Stack)
   HBASE-1145  Ensure that there is only 1 Master with Zookeeper (Removes
               hbase.master) (Nitay Joffe via Stack)
   HBASE-1289  Remove "hbase.fully.distributed" option and update docs
               (Nitay Joffe via Stack)
   HBASE-1234  Change HBase StoreKey format
   HBASE-1348  Move 0.20.0 targeted TRUNK to 0.20.0 hadoop
               (Ryan Rawson and Stack)
   HBASE-1342  Add to filesystem info needed to rebuild .META.
   HBASE-1361  Disable bloom filters
   HBASE-1367  Get rid of Thrift exception 'NotFound'
   HBASE-1381  Remove onelab and bloom filters files from hbase
   HBASE-1411  Remove HLogEdit.
   HBASE-1357  If one sets the hbase.master to 0.0.0.0 non local regionservers
               can't find the master
   HBASE-1304  New client server implementation of how gets and puts are
               handled (holstad, jgray, rawson, stack)
   HBASE-1582  Translate ColumnValueFilter and RowFilterSet to the new
               Filter interface (Clint Morgan and Stack)
   HBASE-1599  Fix TestFilterSet, broken up on hudson (Jon Gray via Stack)
   HBASE-1799  deprecate o.a.h.h.rest in favor of stargate

  BUG FIXES
   HBASE-1140  "ant clean test" fails (Nitay Joffe via Stack)
   HBASE-1129  Master won't go down; stuck joined on rootScanner
   HBASE-1136  HashFunction inadvertently destroys some randomness
               (Jonathan Ellis via Stack)
   HBASE-1138  Test that readers opened after a sync can see all data up to the
               sync (temporary until HADOOP-4379 is resolved)
   HBASE-1121  Cluster confused about where -ROOT- is
   HBASE-1148  Always flush HLog on root or meta region updates
   HBASE-1181  src/saveVersion.sh bails on non-standard Bourne shells
               (e.g. dash) (K M via Jean-Daniel Cryans)
   HBASE-1175  HBA administrative tools do not work when specifying region
               name (Jonathan Gray via Andrew Purtell)
   HBASE-1190  TableInputFormatBase with row filters scan too far (Dave
               Latham via Andrew Purtell)
   HBASE-1198  OOME in IPC server does not trigger abort behavior
   HBASE-1209  Make port displayed the same as is used in URL for RegionServer
               table in UI (Lars George via Stack)
   HBASE-1217  add new compression and hfile blocksize to HColumnDescriptor
   HBASE-859   HStoreKey needs a reworking
   HBASE-1211  NPE in retries exhausted exception
   HBASE-1233  Transactional fixes: Overly conservative scan read-set,
               potential CME (Clint Morgan via Stack)
   HBASE-1239  in the REST interface does not correctly clear the character
               buffer each iteration-1185  wrong request/sec in the gui
               reporting wrong (Brian Beggs via Stack)
   HBASE-1245  hfile meta block handling bugs (Ryan Rawson via Stack)
   HBASE-1238  Under upload, region servers are unable
               to compact when loaded with hundreds of regions
   HBASE-1247  checkAndSave doesn't Write Ahead Log
   HBASE-1243  oldlogfile.dat is screwed, so is it's region
   HBASE-1169  When a shutdown is requested, stop scanning META regions
               immediately
   HBASE-1251  HConnectionManager.getConnection(HBaseConfiguration) returns 
               same HConnection for different HBaseConfigurations 
   HBASE-1157, HBASE-1156 If we do not take start code as a part of region
               server recovery, we could inadvertantly try to reassign regions
               assigned to a restarted server with a different start code;
               Improve lease handling
   HBASE-1267  binary keys broken in trunk (again) -- part 2 and 3
               (Ryan Rawson via Stack)
   HBASE-1268  ZooKeeper config parsing can break HBase startup
               (Nitay Joffe via Stack)
   HBASE-1270  Fix TestInfoServers (Nitay Joffe via Stack)
   HBASE-1277  HStoreKey: Wrong comparator logic (Evgeny Ryabitskiy)
   HBASE-1275  TestTable.testCreateTable broken (Ryan Rawson via Stack)
   HBASE-1274  TestMergeTable is broken in Hudson (Nitay Joffe via Stack)
   HBASE-1283  thrift's package descrpition needs to update for start/stop
               procedure (Rong-en Fan via Stack)
   HBASE-1284  drop table drops all disabled tables
   HBASE-1290  table.jsp either 500s out or doesnt list the regions (Ryan
               Rawson via Andrew Purtell)
   HBASE-1293  hfile doesn't recycle decompressors (Ryan Rawson via Andrew
               Purtell)
   HBASE-1150  HMsg carries safemode flag; remove (Nitay Joffe via Stack)
   HBASE-1232  zookeeper client wont reconnect if there is a problem (Nitay
               Joffe via Andrew Purtell)
   HBASE-1303  Secondary index configuration prevents HBase from starting
               (Ken Weiner via Stack)
   HBASE-1298  master.jsp & table.jsp do not URI Encode table or region
               names in links (Lars George via Stack)
   HBASE-1310  Off by one error in Bytes.vintToBytes
   HBASE-1202  getRow does not always work when specifying number of versions
   HBASE-1324  hbase-1234 broke testget2 unit test (and broke the build)
   HBASE-1321  hbase-1234 broke TestCompaction; fix and reenable
   HBASE-1330  binary keys broken on trunk (Ryan Rawson via Stack)
   HBASE-1332  regionserver carrying .META. starts sucking all cpu, drives load
               up - infinite loop? (Ryan Rawson via Stack)
   HBASE-1334  .META. region running into hfile errors (Ryan Rawson via Stack)
   HBASE-1338  lost use of compaction.dir; we were compacting into live store
               subdirectory
   HBASE-1058  Prevent runaway compactions
   HBASE-1292  php thrift's getRow() would throw an exception if the row does
               not exist (Rong-en Fan via Stack)
   HBASE-1340  Fix new javadoc warnings (Evgeny Ryabitskiy via Stack)
   HBASE-1287  Partitioner class not used in TableMapReduceUtil
               .initTableReduceJob() (Lars George and Billy Pearson via Stack)
   HBASE-1320  hbase-1234 broke filter tests
   HBASE-1355  [performance] Cache family maxversions; we were calculating on
               each access
   HBASE-1358  Bug in reading from Memcache method (read only from snapshot)
               (Evgeny Ryabitskiy via Stack)
   HBASE-1322  hbase-1234 broke TestAtomicIncrement; fix and reenable
               (Evgeny Ryabitskiy and Ryan Rawson via Stack)
   HBASE-1347  HTable.incrementColumnValue does not take negative 'amount'
               (Evgeny Ryabitskiy via Stack)
   HBASE-1365  Typo in TableInputFormatBase.setInputColums (Jon Gray via Stack)
   HBASE-1279  Fix the way hostnames and IPs are handled
   HBASE-1368  HBASE-1279 broke the build
   HBASE-1264  Wrong return values of comparators for ColumnValueFilter
               (Thomas Schneider via Andrew Purtell)
   HBASE-1374  NPE out of ZooKeeperWrapper.loadZooKeeperConfig
   HBASE-1336  Splitting up the compare of family+column into 2 different
               compare 
   HBASE-1377  RS address is null in master web UI
   HBASE-1344  WARN IllegalStateException: Cannot set a region as open if it
               has not been pending
   HBASE-1386  NPE in housekeeping
   HBASE-1396  Remove unused sequencefile and mapfile config. from
               hbase-default.xml
   HBASE-1398  TableOperation doesnt format keys for meta scan properly
               (Ryan Rawson via Stack)
   HBASE-1399  Can't drop tables since HBASE-1398 (Ryan Rawson via Andrew
               Purtell)
   HBASE-1311  ZooKeeperWrapper: Failed to set watcher on ZNode /hbase/master
               (Nitay Joffe via Stack)
   HBASE-1391  NPE in TableInputFormatBase$TableRecordReader.restart if zoo.cfg
               is wrong or missing on task trackers
   HBASE-1323  hbase-1234 broke TestThriftServer; fix and reenable
   HBASE-1425  ColumnValueFilter and WhileMatchFilter fixes on trunk
               (Clint Morgan via Stack)
   HBASE-1431  NPE in HTable.checkAndSave when row doesn't exist (Guilherme
               Mauro Germoglio Barbosa via Andrew Purtell)
   HBASE-1421  Processing a regionserver message -- OPEN, CLOSE, SPLIT, etc. --
               and if we're carrying more than one message in payload, if
               exception, all messages that follow are dropped on floor
   HBASE-1434  Duplicate property in hbase-default.xml (Lars George via Andrew
               Purtell)
   HBASE-1435  HRegionServer is using wrong info bind address from
               hbase-site.xml (Lars George via Stack)
   HBASE-1438  HBASE-1421 broke the build (#602 up on hudson)
   HBASE-1440  master won't go down because joined on a rootscanner that is
               waiting for ever
   HBASE-1441  NPE in ProcessRegionStatusChange#getMetaRegion
   HBASE-1162  CME in Master in RegionManager.applyActions
   HBASE-1010  IOE on regionserver shutdown because hadn't opened an HLog
   HBASE-1415  Stuck on memcache flush
   HBASE-1257  base64 encoded values are not contained in quotes during the
               HBase REST JSON serialization (Brian Beggs via Stack)
   HBASE-1436  Killing regionserver can make corrupted hfile
   HBASE-1272  Unreadable log messages -- "... to the only server
               localhost_1237525439599_56094" <- You'd have to be perverse
               to recognize that as a hostname, startcode, and port
   HBASE-1395  InfoServers no longer put up a UI
   HBASE-1302  When a new master comes up, regionservers should continue with
               their region assignments from the last master
   HBASE-1457  Taking down ROOT/META regionserver can result in cluster
               becoming in-operational (Ryan Rawson via Stack)
   HBASE-1471  During cluster shutdown, deleting zookeeper regionserver nodes
               causes exceptions
   HBASE-1483  HLog split loses track of edits (Clint Morgan via Stack)
   HBASE-1484  commit log split writes files with newest edits first
               (since hbase-1430); should be other way round
   HBASE-1493  New TableMapReduceUtil methods should be static (Billy Pearson
               via Andrew Purtell)
   HBASE-1486  BLOCKCACHE always on even when disabled (Lars George via Stack)
   HBASE-1491  ZooKeeper errors: "Client has seen zxid 0xe our last zxid
               is 0xd"
   HBASE-1499  Fix javadoc warnings after HBASE-1304 commit (Lars George via
               Stack)
   HBASE-1504  Remove left-over debug from 1304 commit
   HBASE-1518  Delete Trackers using compareRow, should just use raw
               binary comparator (Jon Gray via Stack)
   HBASE-1500  KeyValue$KeyComparator array overrun
   HBASE-1513  Compactions too slow
   HBASE-1516  Investigate if StoreScanner will not return the next row if 
               earlied-out of previous row (Jon Gray)
   HBASE-1520  StoreFileScanner catches and ignore IOExceptions from HFile
   HBASE-1522  We delete splits before their time occasionally
   HBASE-1523  NPE in BaseScanner
   HBASE-1525  HTable.incrementColumnValue hangs()
   HBASE-1526  mapreduce fixup
   HBASE-1503  hbase-1304 dropped updating list of store files on flush
               (jgray via stack)
   HBASE-1480  compaction file not cleaned up after a crash/OOME server
               (Evgeny Ryabitskiy via Stack)
   HBASE-1529  familyMap not invalidated when a Result is (re)read as a
               Writable
   HBASE-1528  Ensure scanners work across memcache snapshot
   HBASE-1447  Take last version of the hbase-1249 design doc. and make
               documentation out of it
   HBASE-1206  Scanner spins when there are concurrent inserts to column family
   HBASE-1536  Controlled crash of regionserver not hosting meta/root leaves
               master in spinning state, regions not reassigned
   HBASE-1543  Unnecessary toString during scanning costs us some CPU
   HBASE-1544  Cleanup HTable (Jonathan Gray via Stack)
   HBASE-1488  After 1304 goes in, fix and reenable test of thrift, mr indexer,
               and merge tool
   HBASE-1531  Change new Get to use new filter API
   HBASE-1549  in zookeeper.sh, use localhost instead of 127.0.0.1
   HBASE-1534  Got ZooKeeper event, state: Disconnected on HRS and then NPE on
               reinit
   HBASE-1387  Before release verify all object sizes using Ryans' instrumented
               JVM trick (Erik Holstad via Stack)
   HBASE-1545  atomicIncrements creating new values with Long.MAX_VALUE
   HBASE-1547  atomicIncrement doesnt increase hregion.memcacheSize
   HBASE-1553  ClassSize missing in trunk
   HBASE-1561  HTable Mismatch between javadoc and what it actually does
   HBASE-1558  deletes use 'HConstants.LATEST_TIMESTAMP' but no one translates
               that into 'now'
   HBASE-1508  Shell "close_region" reveals a Master<>HRS problem, regions are
               not reassigned
   HBASE-1568  Client doesnt consult old row filter interface in
               filterSaysStop() - could result in NPE or excessive scanning
   HBASE-1564  in UI make host addresses all look the same -- not IP sometimes
               and host at others
   HBASE-1567  cant serialize new filters
   HBASE-1585  More binary key/value log output cleanup
               (Lars George via Stack)
   HBASE-1563  incrementColumnValue does not write to WAL (Jon Gray via Stack)
   HBASE-1569  rare race condition can take down a regionserver
   HBASE-1450  Scripts passed to hbase shell do not have shell context set up
               for them
   HBASE-1566  using Scan(startRow,stopRow) will cause you to iterate the
               entire table
   HBASE-1560  TIF can't seem to find one region
   HBASE-1580  Store scanner does not consult filter.filterRow at end of scan
               (Clint Morgan via Stack)
   HBASE-1437  broken links in hbase.org
   HBASE-1582  Translate ColumnValueFilter and RowFilterSet to the new Filter
               interface
   HBASE-1594  Fix scan addcolumns after hbase-1385 commit (broke hudson build)
   HBASE-1595  hadoop-default.xml and zoo.cfg in hbase jar
   HBASE-1602  HRegionServer won't go down since we added in new LruBlockCache
   HBASE-1608  TestCachedBlockQueue failing on some jvms (Jon Gray via Stack)
   HBASE-1615  HBASE-1597 introduced a bug when compacting after a split
               (Jon Gray via Stack)
   HBASE-1616  Unit test of compacting referenced StoreFiles (Jon Gray via
               Stack)
   HBASE-1618  Investigate further into the MemStoreFlusher StoreFile limit
               (Jon Gray via Stack)
   HBASE-1625  Adding check to Put.add(KeyValue), to see that it has the same
               row as when instantiated (Erik Holstad via Stack)
   HBASE-1629  HRS unable to contact master
   HBASE-1633  Can't delete in TRUNK shell; makes it hard doing admin repairs
   HBASE-1641  Stargate build.xml causes error in Eclipse
   HBASE-1627  TableInputFormatBase#nextKeyValue catches the wrong exception
               (Doğacan Güney via Stack)
   HBASE-1644  Result.row is cached in getRow; this breaks MapReduce
               (Doğacan Güney via Stack)
   HBASE-1639  clean checkout with empty hbase-site.xml, zk won't start
   HBASE-1646  Scan-s can't set a Filter (Doğacan Güney via Stack)
   HBASE-1649  ValueFilter may not reset its internal state
               (Doğacan Güney via Stack)
   HBASE-1651  client is broken, it requests ROOT region location from ZK too
               much
   HBASE-1650  HBASE-1551 broke the ability to manage non-regionserver
               start-up/shut down. ie: you cant start/stop thrift on a cluster
               anymore
   HBASE-1658  Remove UI refresh -- its annoying
   HBASE-1659  merge tool doesnt take binary regions with \x escape format
   HBASE-1663  Request compaction only once instead of every time 500ms each
               time we cycle the hstore.getStorefilesCount() >
               this.blockingStoreFilesNumber loop
   HBASE-1058  Disable 1058 on catalog tables
   HBASE-1583  Start/Stop of large cluster untenable
   HBASE-1668  hbase-1609 broke TestHRegion.testScanSplitOnRegion unit test
   HBASE-1669  need dynamic extensibility of HBaseRPC code maps and interface
               lists (Clint Morgan via Stack)
   HBASE-1359  After a large truncating table HBase becomes unresponsive
   HBASE-1215  0.19.0 -> 0.20.0 migration (hfile, HCD changes, HSK changes)
   HBASE-1689  Fix javadoc warnings and add overview on client classes to
               client package
   HBASE-1680  FilterList writable only works for HBaseObjectWritable
               defined types (Clint Morgan via Stack and Jon Gray)
   HBASE-1607  transactions / indexing fixes: trx deletes not handeled, index
               scan can't specify stopRow (Clint Morgan via Stack)
   HBASE-1693  NPE close_region ".META." in shell
   HBASE-1706  META row with missing HRI breaks UI
   HBASE-1709  Thrift getRowWithColumns doesn't accept column-family only
               (Mathias Lehmann via Stack)
   HBASE-1692  Web UI is extremely slow / freezes up if you have many tables
   HBASE-1686  major compaction can create empty store files, causing AIOOB
               when trying to read
   HBASE-1705  Thrift server: deletes in mutateRow/s don't delete
               (Tim Sell and Ryan Rawson via Stack)
   HBASE-1703  ICVs across /during a flush can cause multiple keys with the 
               same TS (bad)
   HBASE-1671  HBASE-1609 broke scanners riding across splits
   HBASE-1717  Put on client-side uses passed-in byte[]s rather than always
               using copies
   HBASE-1647  Filter#filterRow is called too often, filters rows it shouldn't
               have (Doğacan Güney via Ryan Rawson and Stack)
   HBASE-1718  Reuse of KeyValue during log replay could cause the wrong
               data to be used
   HBASE-1573  Holes in master state change; updated startcode and server
               go into .META. but catalog scanner just got old values (redux)
   HBASE-1534  Got ZooKeeper event, state: Disconnected on HRS and then NPE
               on reinit
   HBASE-1725  Old TableMap interface's definitions are not generic enough
               (Doğacan Güney via Stack)
   HBASE-1732  Flag to disable regionserver restart
   HBASE-1727  HTD and HCD versions need update
   HBASE-1604  HBaseClient.getConnection() may return a broken connection
               without throwing an exception (Eugene Kirpichov via Stack)
   HBASE-1737  Regions unbalanced when adding new node
   HBASE-1739  hbase-1683 broke splitting; only split three logs no matter
               what N was
   HBASE-1745  [tools] Tool to kick region out of inTransistion
   HBASE-1757  REST server runs out of fds
   HBASE-1768  REST server has upper limit of 5k PUT
   HBASE-1766  Add advanced features to HFile.main() to be able to analyze
               storefile problems
   HBASE-1761  getclosest doesn't understand delete family; manifests as
               "HRegionInfo was null or empty in .META" A.K.A the BS problem
   HBASE-1738  Scanner doesnt reset when a snapshot is created, could miss
               new updates into the 'kvset' (active part)
   HBASE-1767  test zookeeper broken in trunk and 0.20 branch; broken on
               hudson too
   HBASE-1780  HTable.flushCommits clears write buffer in finally clause
   HBASE-1784  Missing rows after medium intensity insert
   HBASE-1809  NPE thrown in BoundedRangeFileInputStream
   HBASE-1810  ConcurrentModificationException in region assignment
               (Mathias Herberts via Stack)
   HBASE-1804  Puts are permitted (and stored) when including an appended colon
   HBASE-1715  Compaction failure in ScanWildcardColumnTracker.checkColumn

  IMPROVEMENTS
   HBASE-1089  Add count of regions on filesystem to master UI; add percentage
               online as difference between whats open and whats on filesystem
               (Samuel Guo via Stack)
   HBASE-1130  PrefixRowFilter (Michael Gottesman via Stack)
   HBASE-1139  Update Clover in build.xml
   HBASE-876   There are a large number of Java warnings in HBase; part 1,
               part 2, part 3, part 4, part 5, part 6, part 7 and part 8
               (Evgeny Ryabitskiy via Stack)
   HBASE-896   Update jruby from 1.1.2 to 1.1.6
   HBASE-1031  Add the Zookeeper jar
   HBASE-1142  Cleanup thrift server; remove Text and profuse DEBUG messaging
               (Tim Sell via Stack)
   HBASE-1064  HBase REST xml/json improvements (Brian Beggs working of
               initial Michael Gottesman work via Stack)
   HBASE-5121  Fix shell usage for format.width
   HBASE-845   HCM.isTableEnabled doesn't really tell if it is, or not
   HBASE-903   [shell] Can't set table descriptor attributes when I alter a
               table
   HBASE-1166  saveVersion.sh doesn't work with git (Nitay Joffe via Stack)
   HBASE-1167  JSP doesn't work in a git checkout (Nitay Joffe via Andrew
               Purtell)
   HBASE-1178  Add shutdown command to shell
   HBASE-1184  HColumnDescriptor is too restrictive with family names
               (Toby White via Andrew Purtell)
   HBASE-1180  Add missing import statements to SampleUploader and remove
               unnecessary @Overrides (Ryan Smith via Andrew Purtell)
   HBASE-1191  ZooKeeper ensureParentExists calls fail 
               on absolute path (Nitay Joffe via Jean-Daniel Cryans)
   HBASE-1187  After disabling/enabling a table, the regions seems to 
               be assigned to only 1-2 region servers
   HBASE-1210  Allow truncation of output for scan and get commands in shell
               (Lars George via Stack)
   HBASE-1221  When using ant -projecthelp to build HBase not all the important
               options show up (Erik Holstad via Stack)
   HBASE-1189  Changing the map type used internally for HbaseMapWritable
               (Erik Holstad via Stack)
   HBASE-1188  Memory size of Java Objects - Make cacheable objects implement
               HeapSize (Erik Holstad via Stack)
   HBASE-1230  Document installation of HBase on Windows
   HBASE-1241  HBase additions to ZooKeeper part 1 (Nitay Joffe via JD)
   HBASE-1231  Today, going from a RowResult to a BatchUpdate reqiures some
               data processing even though they are pretty much the same thing
               (Erik Holstad via Stack)
   HBASE-1240  Would be nice if RowResult could be comparable
               (Erik Holstad via Stack)
   HBASE-803   Atomic increment operations (Ryan Rawson and Jon Gray via Stack)
               Part 1 and part 2 -- fix for a crash.
   HBASE-1252  Make atomic increment perform a binary increment
               (Jonathan Gray via Stack)
   HBASE-1258,1259 ganglia metrics for 'requests' is confusing
               (Ryan Rawson via Stack)
   HBASE-1265  HLogEdit static constants should be final (Nitay Joffe via
               Stack)
   HBASE-1244  ZooKeeperWrapper constants cleanup (Nitay Joffe via Stack)
   HBASE-1262  Eclipse warnings, including performance related things like
               synthetic accessors (Nitay Joffe via Stack)
   HBASE-1273  ZooKeeper WARN spits out lots of useless messages
               (Nitay Joffe via Stack)
   HBASE-1285  Forcing compactions should be available via thrift
               (Tim Sell via Stack)
   HBASE-1186  Memory-aware Maps with LRU eviction for cell cache 
               (Jonathan Gray via Andrew Purtell)
   HBASE-1205  RegionServers should find new master when a new master comes up
               (Nitay Joffe via Andrew Purtell)
   HBASE-1309  HFile rejects key in Memcache with empty value
   HBASE-1331  Lower the default scanner caching value
   HBASE-1235  Add table enabled status to shell and UI
               (Lars George via Stack)
   HBASE-1333  RowCounter updates
   HBASE-1195  If HBase directory exists but version file is inexistent, still
               proceed with bootstrapping (Evgeny Ryabitskiy via Stack)
   HBASE-1301  HTable.getRow() returns null if the row does no exist
               (Rong-en Fan via Stack)
   HBASE-1176  Javadocs in HBA should be clear about which functions are
               asynchronous and which are synchronous
               (Evgeny Ryabitskiy via Stack)
   HBASE-1260  Bytes utility class changes: remove usage of ByteBuffer and
               provide additional ByteBuffer primitives (Jon Gray via Stack)
   HBASE-1183  New MR splitting algorithm and other new features need a way to
               split a key range in N chunks (Jon Gray via Stack)
   HBASE-1350  New method in HTable.java to return start and end keys for
               regions in a table (Vimal Mathew via Stack)
   HBASE-1271  Allow multiple tests to run on one machine
               (Evgeny Ryabitskiy via Stack)
   HBASE-1112  we will lose data if the table name happens to be the logs' dir
               name (Samuel Guo via Stack)
   HBASE-889   The current Thrift API does not allow a new scanner to be
               created without supplying a column list unlike the other APIs.
               (Tim Sell via Stack)
   HBASE-1341  HTable pooler
   HBASE-1379  re-enable LZO using hadoop-gpl-compression library
               (Ryan Rawson via Stack)
   HBASE-1383  hbase shell needs to warn on deleting multi-region table
   HBASE-1286  Thrift should support next(nbRow) like functionality
               (Alex Newman via Stack)
   HBASE-1392  change how we build/configure lzocodec (Ryan Rawson via Stack)
   HBASE-1397  Better distribution in the PerformanceEvaluation MapReduce
               when rows run to the Billions
   HBASE-1393  Narrow synchronization in HLog
   HBASE-1404  minor edit of regionserver logging messages
   HBASE-1405  Threads.shutdown has unnecessary branch
   HBASE-1407  Changing internal structure of ImmutableBytesWritable
               contructor (Erik Holstad via Stack)
   HBASE-1345  Remove distributed mode from MiniZooKeeper (Nitay Joffe via
               Stack)
   HBASE-1414  Add server status logging chore to ServerManager
   HBASE-1379  Make KeyValue implement Writable
               (Erik Holstad and Jon Gray via Stack)
   HBASE-1380  Make KeyValue implement HeapSize
               (Erik Holstad and Jon Gray via Stack)
   HBASE-1413  Fall back to filesystem block size default if HLog blocksize is
               not specified
   HBASE-1417  Cleanup disorientating RPC message
   HBASE-1424  have shell print regioninfo and location on first load if
               DEBUG enabled
   HBASE-1008  [performance] The replay of logs on server crash takes way too
               long
   HBASE-1394  Uploads sometimes fall to 0 requests/second (Binding up on
               HLog#append?)
   HBASE-1429  Allow passing of a configuration object to HTablePool
   HBASE-1432  LuceneDocumentWrapper is not public
   HBASE-1401  close HLog (and open new one) if there hasnt been edits in N
               minutes/hours
   HBASE-1420  add abliity to add and remove (table) indexes on existing
               tables (Clint Morgan via Stack)
   HBASE-1430  Read the logs in batches during log splitting to avoid OOME
   HBASE-1017  Region balancing does not bring newly added node within
               acceptable range (Evgeny Ryabitskiy via Stack)
   HBASE-1454  HBaseAdmin.getClusterStatus
   HBASE-1236  Improve readability of table descriptions in the UI
               (Lars George and Alex Newman via Stack)
   HBASE-1455  Update DemoClient.py for thrift 1.0 (Tim Sell via Stack)
   HBASE-1464  Add hbase.regionserver.logroll.period to hbase-default
   HBASE-1192  LRU-style map for the block cache (Jon Gray and Ryan Rawson
               via Stack)
   HBASE-1466  Binary keys are not first class citizens
               (Ryan Rawson via Stack)
   HBASE-1445  Add the ability to start a master from any machine
   HBASE-1474  Add zk attributes to list of attributes 
               in master and regionserver UIs
   HBASE-1448  Add a node in ZK to tell all masters to shutdown
   HBASE-1478  Remove hbase master options from shell (Nitay Joffe via Stack)
   HBASE-1462  hclient still seems to depend on master
   HBASE-1143  region count erratic in master UI
   HBASE-1490  Update ZooKeeper library
   HBASE-1489  Basic git ignores for people who use git and eclipse
   HBASE-1453  Add HADOOP-4681 to our bundled hadoop, add to 'gettting started'
               recommendation that hbase users backport 
   HBASE-1507  iCMS as default JVM
   HBASE-1509  Add explanation to shell "help" command on how to use binarykeys
               (Lars George via Stack)
   HBASE-1514  hfile inspection tool
   HBASE-1329  Visibility into ZooKeeper
   HBASE-867   If millions of columns in a column family, hbase scanner won't
               come up (Jonathan Gray via Stack)
   HBASE-1538  Up zookeeper timeout from 10 seconds to 30 seconds to cut down
               on hbase-user traffic
   HBASE-1539  prevent aborts due to missing zoo.cfg
   HBASE-1488  Fix TestThriftServer and re-enable it
   HBASE-1541  Scanning multiple column families in the presence of deleted 
               families results in bad scans
   HBASE-1540  Client delete unit test, define behavior
               (Jonathan Gray via Stack)
   HBASE-1552  provide version running on cluster via getClusterStatus
   HBASE-1550  hbase-daemon.sh stop should provide more information when stop
               command fails
   HBASE-1515  Address part of config option hbase.regionserver unnecessary
   HBASE-1532  UI Visibility into ZooKeeper
   HBASE-1572  Zookeeper log4j property set to ERROR on default, same output
               when cluster working and not working (Jon Gray via Stack)
   HBASE-1576  TIF needs to be able to set scanner caching size for smaller
               row tables & performance
   HBASE-1577  Move memcache to ConcurrentSkipListMap from
               ConcurrentSkipListSet
   HBASE-1578  Change the name of the in-memory updates from 'memcache' to
               'memtable' or....
   HBASE-1562  How to handle the setting of 32 bit versus 64 bit machines
               (Erik Holstad via Stack)
   HBASE-1584  Put add methods should return this for ease of use (Be
               consistant with Get) (Clint Morgan via Stack)
   HBASE-1581  Run major compaction on .META. when table is dropped or
               truncated
   HBASE-1587  Update ganglia config and doc to account for ganglia 3.1 and
               hadoop-4675
   HBASE-1589  Up zk maxClientCnxns from default of 10 to 20 or 30 or so
   HBASE-1385  Revamp TableInputFormat, needs updating to match hadoop 0.20.x
               AND remove bit where we can make < maps than regions
               (Lars George via Stack)
   HBASE-1596  Remove WatcherWrapper and have all users of Zookeeper provide a
               Watcher
   HBASE-1597  Prevent unnecessary caching of blocks during compactions
               (Jon Gray via Stack)
   HBASE-1607  Redo MemStore heap sizing to be accurate, testable, and more
               like new LruBlockCache (Jon Gray via Stack)
   HBASE-1218  Implement in-memory column (Jon Gray via Stack)
   HBASE-1606  Remove zoo.cfg, put config options into hbase-site.xml
   HBASE-1575  HMaster does not handle ZK session expiration
   HBASE-1620  Need to use special StoreScanner constructor for major
               compactions (passed sf, no caching, etc) (Jon Gray via Stack)
   HBASE-1624  Don't sort Puts if only one in list in HCM#processBatchOfRows
   HBASE-1626  Allow emitting Deletes out of new TableReducer
               (Lars George via Stack)
   HBASE-1551  HBase should manage multiple node ZooKeeper quorum
   HBASE-1637  Delete client class methods should return itself like Put, Get,
               Scan (Jon Gray via Nitay)
   HBASE-1640  Allow passing arguments to jruby script run when run by hbase
               shell
   HBASE-698   HLog recovery is not performed after master failure
   HBASE-1643  ScanDeleteTracker takes comparator but it unused
   HBASE-1603  MR failed "RetriesExhaustedException: Trying to contact region
               server Some server for region TestTable..." -- deubugging
   HBASE-1470  hbase and HADOOP-4379, dhruba's flush/sync
   HBASE-1632  Write documentation for configuring/managing ZooKeeper
   HBASE-1662  Tool to run major compaction on catalog regions when hbase is
               shutdown
   HBASE-1665  expose more load information to the client side
   HBASE-1609  We wait on leases to expire before regionserver goes down.
               Rather, just let client fail
   HBASE-1655  Usability improvements to HTablePool (Ken Weiner via jgray)
   HBASE-1688  Improve javadocs in Result and KeyValue
   HBASE-1694  Add TOC to 'Getting Started', add references to THBase and
               ITHBase
   HBASE-1699  Remove hbrep example as it's too out of date
               (Tim Sell via Stack)
   HBASE-1683  OOME on master splitting logs; stuck, won't go down
   HBASE-1704  Better zk error when failed connect
   HBASE-1714  Thrift server: prefix scan API
   HBASE-1719  hold a reference to the region in stores instead of only the
               region info
   HBASE-1743  [debug tool] Add regionsInTransition list to ClusterStatus
               detailed output
   HBASE-1772  Up the default ZK session timeout from 30seconds to 60seconds

  OPTIMIZATIONS
   HBASE-1412  Change values for delete column and column family in KeyValue
   HBASE-1535  Add client ability to perform mutations without the WAL
               (Jon Gray via Stack)
   HBASE-1460  Concurrent LRU Block Cache (Jon Gray via Stack)
   HBASE-1635  PerformanceEvaluation should use scanner prefetching

Release 0.19.0 - 01/21/2009
  INCOMPATIBLE CHANGES
   HBASE-885   TableMap and TableReduce should be interfaces
               (Doğacan Güney via Stack)
   HBASE-905   Remove V5 migration classes from 0.19.0 (Jean-Daniel Cryans via
               Jim Kellerman)
   HBASE-852   Cannot scan all families in a row with a LIMIT, STARTROW, etc.
               (Izaak Rubin via Stack)
   HBASE-953   Enable BLOCKCACHE by default [WAS -> Reevaluate HBASE-288 block
               caching work....?] -- Update your hbase-default.xml file!
   HBASE-636   java6 as a requirement
   HBASE-994   IPC interfaces with different versions can cause problems
   HBASE-1028  If key does not exist, return null in getRow rather than an
               empty RowResult
   HBASE-1134  OOME in HMaster when HBaseRPC is older than 0.19

  BUG FIXES
   HBASE-891   HRS.validateValuesLength throws IOE, gets caught in the retries
   HBASE-892   Cell iteration is broken (Doğacan Güney via Jim Kellerman)
   HBASE-898   RowResult.containsKey(String) doesn't work
               (Doğacan Güney via Jim Kellerman)
   HBASE-906   [shell] Truncates output
   HBASE-912   PE is broken when other tables exist
   HBASE-853   [shell] Cannot describe meta tables (Izaak Rubin via Stack)
   HBASE-844   Can't pass script to hbase shell 
   HBASE-837   Add unit tests for ThriftServer.HBaseHandler (Izaak Rubin via
               Stack)
   HBASE-913   Classes using log4j directly
   HBASE-914   MSG_REPORT_CLOSE has a byte array for a message
   HBASE-918   Region balancing during startup makes cluster unstable
   HBASE-921   region close and open processed out of order; makes for 
               disagreement between master and regionserver on region state
   HBASE-925   HRS NPE on way out if no master to connect to
   HBASE-928   NPE throwing RetriesExhaustedException
   HBASE-924   Update hadoop in lib on 0.18 hbase branch to 0.18.1
   HBASE-929   Clarify that ttl in HColumnDescriptor is seconds
   HBASE-930   RegionServer stuck: HLog: Could not append. Requesting close of
               log java.io.IOException: Could not get block locations
   HBASE-926   If no master, regionservers should hang out rather than fail on
               connection and shut themselves down
   HBASE-919   Master and Region Server need to provide root region location if
               they are using HTable
               With J-D's one line patch, test cases now appear to work and
               PerformanceEvaluation works as before.
   HBASE-939   NPE in HStoreKey
   HBASE-945   Be consistent in use of qualified/unqualified mapfile paths
   HBASE-946   Row with 55k deletes timesout scanner lease
   HBASE-950   HTable.commit no longer works with existing RowLocks though it's
               still in API
   HBASE-952   Deadlock in HRegion.batchUpdate
   HBASE-954   Don't reassign root region until ProcessServerShutdown has split
               the former region server's log
   HBASE-957   PerformanceEvaluation tests if table exists by comparing
               descriptors
   HBASE-728,  HBASE-956, HBASE-955 Address thread naming, which threads are
               Chores, vs Threads, make HLog manager the write ahead log and
               not extend it to provided optional HLog sync operations.
   HBASE-970   Update the copy/rename scripts to go against change API
   HBASE-966   HBASE-748 misses some writes
   HBASE-971   Fix the failing tests on Hudson
   HBASE-973   [doc] In getting started, make it clear that hbase needs to
               create its directory in hdfs
   HBASE-963   Fix the retries in HTable.flushCommit
   HBASE-969   Won't when storefile > 2G.
   HBASE-976   HADOOP 0.19.0 RC0 is broke; replace with HEAD of branch-0.19
   HBASE-977   Arcane HStoreKey comparator bug
   HBASE-979   REST web app is not started automatically
   HBASE-980   Undo core of HBASE-975, caching of start and end row
   HBASE-982   Deleting a column in MapReduce fails (Doğacan Güney via
               Stack)
   HBASE-984   Fix javadoc warnings
   HBASE-985   Fix javadoc warnings
   HBASE-951   Either shut down master or let it finish cleanup
   HBASE-964   Startup stuck "waiting for root region"
   HBASE-964, HBASE-678 provide for safe-mode without locking up HBase "waiting
               for root region"
   HBASE-990   NoSuchElementException in flushSomeRegions; took two attempts.
   HBASE-602   HBase Crash when network card has a IPv6 address
   HBASE-996   Migration script to up the versions in catalog tables
   HBASE-991   Update the mapred package document examples so they work with
               TRUNK/0.19.0.
   HBASE-1003  If cell exceeds TTL but not VERSIONs, will not be removed during
               major compaction
   HBASE-1005  Regex and string comparison operators for ColumnValueFilter
   HBASE-910   Scanner misses columns / rows when the scanner is obtained
               during a memcache flush
   HBASE-1009  Master stuck in loop wanting to assign but regions are closing
   HBASE-1016  Fix example in javadoc overvie
   HBASE-1021  hbase metrics FileContext not working
   HBASE-1023  Check global flusher
   HBASE-1036  HBASE-1028 broke Thrift
   HBASE-1037  Some test cases failing on Windows/Cygwin but not UNIX/Linux
   HBASE-1041  Migration throwing NPE
   HBASE-1042  OOME but we don't abort; two part commit.
   HBASE-927   We don't recover if HRS hosting -ROOT-/.META. goes down
   HBASE-1029  REST wiki documentation incorrect
               (Sishen Freecity via Stack)
   HBASE-1043  Removing @Override attributes where they are no longer needed.
               (Ryan Smith via Jim Kellerman)
   HBASE-927   We don't recover if HRS hosting -ROOT-/.META. goes down -
               (fix bug in createTable which caused tests to fail)
   HBASE-1039  Compaction fails if bloomfilters are enabled
   HBASE-1027  Make global flusher check work with percentages rather than
               hard code memory sizes
   HBASE-1000  Sleeper.sleep does not go back to sleep when interrupted
               and no stop flag given.
   HBASE-900   Regionserver memory leak causing OOME during relatively
               modest bulk importing; part 1 and part 2
   HBASE-1054  Index NPE on scanning (Clint Morgan via Andrew Purtell)
   HBASE-1052  Stopping a HRegionServer with unflushed cache causes data loss
               from org.apache.hadoop.hbase.DroppedSnapshotException
   HBASE-1059  ConcurrentModificationException in notifyChangedReadersObservers
   HBASE-1063  "File separator problem on Windows" (Max Lehn via Stack)
   HBASE-1068  TestCompaction broken on hudson
   HBASE-1067  TestRegionRebalancing broken by running of hdfs shutdown thread
   HBASE-1070  Up default index interval in TRUNK and branch
   HBASE-1045  Hangup by regionserver causes write to fail
   HBASE-1079  Dumb NPE in ServerCallable hides the RetriesExhausted exception
   HBASE-782   The DELETE key in the hbase shell deletes the wrong character
               (Tim Sell via Stack)
   HBASE-543,  HBASE-1046, HBase-1051 A region's state is kept in several places
               in the master opening the possibility for race conditions
   HBASE-1087  DFS failures did not shutdown regionserver
   HBASE-1072  Change Thread.join on exit to a timed Thread.join
   HBASE-1098  IllegalStateException: Cannot set a region to be closed it it
               was not already marked as closing
   HBASE-1100  HBASE-1062 broke TestForceSplit
   HBASE-1191  shell tools -> close_region does not work for regions that did
               not deploy properly on startup
   HBASE-1093  NPE in HStore#compact
   HBASE-1097  SequenceFile.Reader keeps around buffer whose size is that of
               largest item read -> results in lots of dead heap
   HBASE-1107  NPE in HStoreScanner.updateReaders
   HBASE-1083  Will keep scheduling major compactions if last time one ran, we
               didn't.
   HBASE-1101  NPE in HConnectionManager$TableServers.processBatchOfRows
   HBASE-1099  Regions assigned while master is splitting logs of recently
               crashed server; regionserver tries to execute incomplete log
   HBASE-1104, HBASE-1098, HBASE-1096: Doubly-assigned regions redux,
               IllegalStateException: Cannot set a region to be closed it it was
               not already marked as closing, Does not recover if HRS carrying 
               -ROOT- goes down
   HBASE-1114  Weird NPEs compacting
   HBASE-1116  generated web.xml and svn don't play nice together
   HBASE-1119  ArrayOutOfBoundsException in HStore.compact
   HBASE-1121  Cluster confused about where -ROOT- is
   HBASE-1125  IllegalStateException: Cannot set a region to be closed if it was
               not already marked as pending close
   HBASE-1124  Balancer kicks in way too early
   HBASE-1127  OOME running randomRead PE
   HBASE-1132  Can't append to HLog, can't roll log, infinite cycle (another
               spin on HBASE-930)

  IMPROVEMENTS
   HBASE-901   Add a limit to key length, check key and value length on client side
   HBASE-890   Alter table operation and also related changes in REST interface
               (Sishen Freecity via Stack)
   HBASE-894   [shell] Should be able to copy-paste table description to create
               new table (Sishen Freecity via Stack)
   HBASE-886, HBASE-895 Sort the tables in the web UI, [shell] 'list' command
               should emit a sorted list of tables (Krzysztof Szlapinski via Stack)
   HBASE-884   Double and float converters for Bytes class
               (Doğacan Güney via Stack)
   HBASE-908   Add approximate counting to CountingBloomFilter
               (Andrzej Bialecki via Stack)
   HBASE-920   Make region balancing sloppier
   HBASE-902   Add force compaction and force split operations to UI and Admin
   HBASE-942   Add convenience methods to RowFilterSet
               (Clint Morgan via Stack)
   HBASE-943   to ColumnValueFilter: add filterIfColumnMissing property, add
               SubString operator (Clint Morgan via Stack)
   HBASE-937   Thrift getRow does not support specifying columns
               (Doğacan Güney via Stack)
   HBASE-959   Be able to get multiple RowResult at one time from client side
               (Sishen Freecity via Stack)
   HBASE-936   REST Interface: enable get number of rows from scanner interface
               (Sishen Freecity via Stack)
   HBASE-960   REST interface: more generic column family configure and also
               get Rows using offset and limit (Sishen Freecity via Stack)
   HBASE-817   Hbase/Shell Truncate
   HBASE-949   Add an HBase Manual
   HBASE-839   Update hadoop libs in hbase; move hbase TRUNK on to an hadoop
               0.19.0 RC
   HBASE-785   Remove InfoServer, use HADOOP-3824 StatusHttpServer 
               instead (requires hadoop 0.19)
   HBASE-81    When a scanner lease times out, throw a more "user friendly" exception
   HBASE-978   Remove BloomFilterDescriptor. It is no longer used.
   HBASE-975   Improve MapFile performance for start and end key
   HBASE-961   Delete multiple columns by regular expression
               (Samuel Guo via Stack)
   HBASE-722   Shutdown and Compactions
   HBASE-983   Declare Perl namespace in Hbase.thrift
   HBASE-987   We need a Hbase Partitioner for TableMapReduceUtil.initTableReduceJob
               MR Jobs (Billy Pearson via Stack)
   HBASE-993   Turn off logging of every catalog table row entry on every scan
   HBASE-992   Up the versions kept by catalog tables; currently 1. Make it 10?
   HBASE-998   Narrow getClosestRowBefore by passing column family
   HBASE-999   Up versions on historian and keep history of deleted regions for a
               while rather than delete immediately
   HBASE-938   Major compaction period is not checked periodically
   HBASE-947   [Optimization] Major compaction should remove deletes as well as
               the deleted cell
   HBASE-675   Report correct server hosting a table split for assignment to
               for MR Jobs
   HBASE-927   We don't recover if HRS hosting -ROOT-/.META. goes down
   HBASE-1013  Add debugging around commit log cleanup
   HBASE-972   Update hbase trunk to use released hadoop 0.19.0
   HBASE-1022  Add storefile index size to hbase metrics
   HBASE-1026  Tests in mapred are failing
   HBASE-1020  Regionserver OOME handler should dump vital stats
   HBASE-1018  Regionservers should report detailed health to master
   HBASE-1034  Remove useless TestToString unit test
   HBASE-1030  Bit of polish on HBASE-1018
   HBASE-847   new API: HTable.getRow with numVersion specified
               (Doğacan Güney via Stack)
   HBASE-1048  HLog: Found 0 logs to remove out of total 1450; oldest
               outstanding seqnum is 162297053 fr om region -ROOT-,,0
   HBASE-1055  Better vm stats on startup
   HBASE-1065  Minor logging improvements in the master
   HBASE-1053  bring recent rpc changes down from hadoop
   HBASE-1056  [migration] enable blockcaching on .META. table
   HBASE-1069  Show whether HRegion major compacts or not in INFO level
   HBASE-1066  Master should support close/open/reassignment/enable/disable
               operations on individual regions
   HBASE-1062  Compactions at (re)start on a large table can overwhelm DFS
   HBASE-1102  boolean HTable.exists()
   HBASE-1105  Remove duplicated code in HCM, add javadoc to RegionState, etc.
   HBASE-1106  Expose getClosestRowBefore in HTable
               (Michael Gottesman via Stack)
   HBASE-1082  Administrative functions for table/region maintenance
   HBASE-1090  Atomic Check And Save in HTable (Michael Gottesman via Stack)
   HBASE-1137  Add not on xceivers count to overview documentation

  NEW FEATURES
   HBASE-875   Use MurmurHash instead of JenkinsHash [in bloomfilters]
               (Andrzej Bialecki via Stack)
   HBASE-625   Metrics support for cluster load history: emissions and graphs
   HBASE-883   Secondary indexes (Clint Morgan via Andrew Purtell)
   HBASE-728   Support for HLog appends

  OPTIMIZATIONS
   HBASE-748   Add an efficient way to batch update many rows
   HBASE-887   Fix a hotspot in scanners
   HBASE-967   [Optimization] Cache cell maximum length (HCD.getMaxValueLength);
               its used checking batch size
   HBASE-940   Make the TableOutputFormat batching-aware
   HBASE-576   Investigate IPC performance

Release 0.18.0 - September 21st, 2008

  INCOMPATIBLE CHANGES
   HBASE-697   Thrift idl needs update/edit to match new 0.2 API (and to fix bugs)
               (Tim Sell via Stack)
   HBASE-822   Update thrift README and HBase.thrift to use thrift 20080411
               Updated all other languages examples (only python went in)

  BUG FIXES
   HBASE-881   Fixed bug when Master tries to reassign split or offline regions
               from a dead server
   HBASE-860   Fixed Bug in IndexTableReduce where it concerns writing lucene 
               index fields.
   HBASE-805   Remove unnecessary getRow overloads in HRS (Jonathan Gray via
               Jim Kellerman) (Fix whitespace diffs in HRegionServer)
   HBASE-811   HTD is not fully copyable (Andrew Purtell via Jim Kellerman)
   HBASE-729   Client region/metadata cache should have a public method for
               invalidating entries (Andrew Purtell via Stack)
   HBASE-819   Remove DOS-style ^M carriage returns from all code where found
               (Jonathan Gray via Jim Kellerman)
   HBASE-818   Deadlock running 'flushSomeRegions' (Andrew Purtell via Stack)
   HBASE-820   Need mainline to flush when 'Blocking updates' goes up.
               (Jean-Daniel Cryans via Stack)
   HBASE-821   UnknownScanner happens too often (Jean-Daniel Cryans via Stack)
   HBASE-813   Add a row counter in the new shell (Jean-Daniel Cryans via Stack)
   HBASE-824   Bug in Hlog we print array of byes for region name
               (Billy Pearson via Stack)
   HBASE-825   Master logs showing byte [] in place of string in logging
               (Billy Pearson via Stack)
   HBASE-808,809 MAX_VERSIONS not respected, and Deletall doesn't and inserts
               after delete don't work as expected
               (Jean-Daniel Cryans via Stack)
   HBASE-831   committing BatchUpdate with no row should complain
               (Andrew Purtell via Jim Kellerman)
   HBASE-833   Doing an insert with an unknown family throws a NPE in HRS
   HBASE-810   Prevent temporary deadlocks when, during a scan with write
               operations, the region splits (Jean-Daniel Cryans via Jim
               Kellerman)
   HBASE-843   Deleting and recreating a table in a single process does not work
               (Jonathan Gray via Jim Kellerman)
   HBASE-849   Speed improvement in JenkinsHash (Andrzej Bialecki via Stack)
   HBASE-552   Bloom filter bugs (Andrzej Bialecki via Jim Kellerman)
   HBASE-762   deleteFamily takes timestamp, should only take row and family.
               Javadoc describes both cases but only implements the timestamp
               case. (Jean-Daniel Cryans via Jim Kellerman)
   HBASE-768   This message 'java.io.IOException: Install 0.1.x of hbase and run
               its migration first' is useless (Jean-Daniel Cryans via Jim
               Kellerman)
   HBASE-826   Delete table followed by recreation results in honked table
   HBASE-834   'Major' compactions and upper bound on files we compact at any
               one time (Billy Pearson via Stack)
   HBASE-836   Update thrift examples to work with changed IDL (HBASE-697)
               (Toby White via Stack)
   HBASE-854   hbase-841 broke build on hudson? - makes sure that proxies are
               closed. (Andrew Purtell via Jim Kellerman)
   HBASE-855   compaction can return less versions then we should in some cases
               (Billy Pearson via Stack)
   HBASE-832   Problem with row keys beginnig with characters < than ',' and
               the region location cache
   HBASE-864   Deadlock in regionserver
   HBASE-865   Fix javadoc warnings (Rong-En Fan via Jim Kellerman)
   HBASE-872   Getting exceptions in shell when creating/disabling tables
   HBASE-868   Incrementing binary rows cause strange behavior once table
               splits (Jonathan Gray via Stack)
   HBASE-877   HCM is unable to find table with multiple regions which contains
               binary (Jonathan Gray via Stack)

  IMPROVEMENTS
   HBASE-801  When a table haven't disable, shell could response in a "user
              friendly" way.
   HBASE-816  TableMap should survive USE (Andrew Purtell via Stack)
   HBASE-812  Compaction needs little better skip algo (Daniel Leffel via Stack)
   HBASE-806  Change HbaseMapWritable and RowResult to implement SortedMap
              instead of Map (Jonathan Gray via Stack)
   HBASE-795  More Table operation in TableHandler for REST interface: part 1
              (Sishen Freecity via Stack)
   HBASE-795  More Table operation in TableHandler for REST interface: part 2
              (Sishen Freecity via Stack)
   HBASE-830  Debugging HCM.locateRegionInMeta is painful
   HBASE-784  Base hbase-0.3.0 on hadoop-0.18
   HBASE-841  Consolidate multiple overloaded methods in HRegionInterface,
              HRegionServer (Jean-Daniel Cryans via Jim Kellerman)
   HBASE-840  More options on the row query in REST interface
              (Sishen Freecity via Stack)
   HBASE-874  deleting a table kills client rpc; no subsequent communication if
              shell or thrift server, etc. (Jonathan Gray via Jim Kellerman)
   HBASE-871  Major compaction periodicity should be specifyable at the column
              family level, not cluster wide (Jonathan Gray via Stack)
   HBASE-465  Fix javadoc for all public declarations
   HBASE-882  The BatchUpdate class provides, put(col, cell) and delete(col)
              but no get() (Ryan Smith via Stack and Jim Kellerman)

  NEW FEATURES
   HBASE-787  Postgresql to HBase table replication example (Tim Sell via Stack)
   HBASE-798  Provide Client API to explicitly lock and unlock rows (Jonathan
              Gray via Jim Kellerman)
   HBASE-798  Add missing classes: UnknownRowLockException and RowLock which
              were present in previous versions of the patches for this issue,
              but not in the version that was committed. Also fix a number of
              compilation problems that were introduced by patch.
   HBASE-669  MultiRegion transactions with Optimistic Concurrency Control
              (Clint Morgan via Stack)
   HBASE-842  Remove methods that have Text as a parameter and were deprecated
              in 0.2.1 (Jean-Daniel Cryans via Jim Kellerman)

  OPTIMIZATIONS

Release 0.2.0 - August 8, 2008.

  INCOMPATIBLE CHANGES
   HBASE-584   Names in the filter interface are confusing (Clint Morgan via
               Jim Kellerman) (API change for filters)
   HBASE-601   Just remove deprecated methods in HTable; 0.2 is not backward
               compatible anyways
   HBASE-82    Row keys should be array of bytes
   HBASE-76    Purge servers of Text (Done as part of HBASE-82 commit).
   HBASE-487   Replace hql w/ a hbase-friendly jirb or jython shell
               Part 1: purge of hql and added raw jirb in its place.
   HBASE-521   Improve client scanner interface
   HBASE-288   Add in-memory caching of data. Required update of hadoop to 
               0.17.0-dev.2008-02-07_12-01-58. (Tom White via Stack) 
   HBASE-696   Make bloomfilter true/false and self-sizing
   HBASE-720   clean up inconsistencies around deletes (Izaak Rubin via Stack)
   HBASE-796   Deprecates Text methods from HTable
               (Michael Gottesman via Stack)

  BUG FIXES
   HBASE-574   HBase does not load hadoop native libs (Rong-En Fan via Stack)
   HBASE-598   Loggging, no .log file; all goes into .out
   HBASE-622   Remove StaticTestEnvironment and put a log4j.properties in src/test
   HBASE-624   Master will shut down if number of active region servers is zero
               even if shutdown was not requested
   HBASE-629   Split reports incorrect elapsed time
   HBASE-623   Migration script for hbase-82
   HBASE-630   Default hbase.rootdir is garbage
   HBASE-589   Remove references to deprecated methods in Hadoop once
               hadoop-0.17.0 is released
   HBASE-638   Purge \r from src
   HBASE-644   DroppedSnapshotException but RegionServer doesn't restart
   HBASE-641   Improve master split logging
   HBASE-642   Splitting log in a hostile environment -- bad hdfs -- we drop
               write-ahead-log edits
   HBASE-646   EOFException opening HStoreFile info file (spin on HBASE-645and 550)
   HBASE-648   If mapfile index is empty, run repair
   HBASE-640   TestMigrate failing on hudson
   HBASE-651   Table.commit should throw NoSuchColumnFamilyException if column
               family doesn't exist
   HBASE-649   API polluted with default and protected access data members and methods
   HBASE-650   Add String versions of get, scanner, put in HTable
   HBASE-656   Do not retry exceptions such as unknown scanner or illegal argument
   HBASE-659   HLog#cacheFlushLock not cleared; hangs a region
   HBASE-663   Incorrect sequence number for cache flush
   HBASE-655   Need programmatic way to add column family: need programmatic way
               to enable/disable table
   HBASE-654   API HTable.getMetadata().addFamily shouldn't be exposed to user
   HBASE-666   UnmodifyableHRegionInfo gives the wrong encoded name
   HBASE-668   HBASE-533 broke build
   HBASE-670   Historian deadlocks if regionserver is at global memory boundary
               and is hosting .META.
   HBASE-665   Server side scanner doesn't honor stop row
   HBASE-662   UI in table.jsp gives META locations, not the table's regions
               location (Jean-Daniel Cryans via Stack)
   HBASE-676   Bytes.getInt returns a long (Clint Morgan via Stack)
   HBASE-680   Config parameter hbase.io.index.interval  should be
               hbase.index.interval, according to HBaseMapFile.HbaseWriter
               (LN via Stack)
   HBASE-682   Unnecessary iteration in HMemcache.internalGet? got much better
               reading performance after break it (LN via Stack)
   HBASE-686   MemcacheScanner didn't return the first row(if it exists),
               because HScannerInterface's output incorrect (LN via Jim Kellerman)
   HBASE-691   get* and getScanner are different in how they treat column parameter
   HBASE-694   HStore.rowAtOrBeforeFromMapFile() fails to locate the row if # of mapfiles >= 2
               (Rong-En Fan via Bryan)
   HBASE-652   dropping table fails silently if table isn't disabled
   HBASE-683   can not get svn revision # at build time if locale is not english
               (Rong-En Fan via Stack)
   HBASE-699   Fix TestMigrate up on Hudson
   HBASE-615   Region balancer oscillates during cluster startup
   HBASE-613   Timestamp-anchored scanning fails to find all records
   HBASE-681   NPE in Memcache
   HBASE-701   Showing bytes in log when should be String
   HBASE-702   deleteall doesn't
   HBASE-704   update new shell docs and commands on help menu
   HBASE-709   Deadlock while rolling WAL-log while finishing flush
   HBASE-710   If clocks are way off, then we can have daughter split come
               before rather than after its parent in .META.
   HBASE-714   Showing bytes in log when should be string (2)
   HBASE-627   Disable table doesn't work reliably
   HBASE-716   TestGet2.testGetClosestBefore fails with hadoop-0.17.1
   HBASE-715   Base HBase 0.2 on Hadoop 0.17.1
   HBASE-718   hbase shell help info
   HBASE-717   alter table broke with new shell returns InvalidColumnNameException
   HBASE-573   HBase does not read hadoop-*.xml for dfs configuration after 
               moving out hadoop/contrib
   HBASE-11    Unexpected exits corrupt DFS
   HBASE-12    When hbase regionserver restarts, it says "impossible state for
               createLease()"
   HBASE-575   master dies with stack overflow error if rootdir isn't qualified
   HBASE-582   HBase 554 forgot to clear results on each iteration caused by a filter
               (Clint Morgan via Stack)
   HBASE-532   Odd interaction between HRegion.get, HRegion.deleteAll and compactions
   HBASE-10    HRegionServer hangs upon exit due to DFSClient Exception
   HBASE-595   RowFilterInterface.rowProcessed() is called *before* fhe final
               filtering decision is made (Clint Morgan via Stack)
   HBASE-586   HRegion runs HStore memcache snapshotting -- fix it so only HStore
               knows about workings of memcache
   HBASE-588   Still a 'hole' in scanners, even after HBASE-532
   HBASE-604   Don't allow CLASSPATH from environment pollute the hbase CLASSPATH
   HBASE-608   HRegionServer::getThisIP() checks hadoop config var for dns interface name
               (Jim R. Wilson via Stack)
   HBASE-609   Master doesn't see regionserver edits because of clock skew
   HBASE-607   MultiRegionTable.makeMultiRegionTable is not deterministic enough
               for regression tests
   HBASE-405   TIF and TOF use log4j directly rather than apache commons-logging
   HBASE-618   We always compact if 2 files, regardless of the compaction threshold setting
   HBASE-619   Fix 'logs' link in UI
   HBASE-478   offlining of table does not run reliably
   HBASE-453   undeclared throwable exception from HTable.get
   HBASE-620   testmergetool failing in branch and trunk since hbase-618 went in
   HBASE-550   EOF trying to read reconstruction log stops region deployment
   HBASE-551   Master stuck splitting server logs in shutdown loop; on each
               iteration, edits are aggregated up into the millions
   HBASE-505   Region assignments should never time out so long as the region
               server reports that it is processing the open request
   HBASE-561   HBase package does not include LICENSE.txt nor build.xml
   HBASE-563   TestRowFilterAfterWrite erroneously sets master address to
               0.0.0.0:60100 rather than relying on conf
   HBASE-507   Use Callable pattern to sleep between retries
   HBASE-564   Don't do a cache flush if there are zero entries in the cache.
   HBASE-554   filters generate StackOverflowException
   HBASE-567   Reused BatchUpdate instances accumulate BatchOperations
   HBASE-577   NPE getting scanner
   HBASE-19    CountingBloomFilter can overflow its storage
               (Stu Hood and Bryan Duxbury via Stack)
   HBASE-28    thrift put/mutateRow methods need to throw IllegalArgument
               exceptions (Dave Simpson via Bryan Duxbury via Stack)
   HBASE-2     hlog numbers should wrap around when they reach 999
               (Bryan Duxbury via Stack)
   HBASE-421   TestRegionServerExit broken
   HBASE-426   hbase can't find remote filesystem
   HBASE-437   Clear Command should use system.out (Edward Yoon via Stack)
   HBASE-434, HBASE-435 TestTableIndex and TestTableMapReduce failed in Hudson builds
   HBASE-446   Fully qualified hbase.rootdir doesn't work
   HBASE-438   XMLOutputter state should be initialized. (Edward Yoon via Stack)
   HBASE-8     Delete table does not remove the table directory in the FS
   HBASE-428   Under continuous upload of rows, WrongRegionExceptions are thrown
               that reach the client even after retries
   HBASE-460   TestMigrate broken when HBase moved to subproject   
   HBASE-462   Update migration tool
   HBASE-473   When a table is deleted, master sends multiple close messages to
               the region server
   HBASE-490   Doubly-assigned .META.; master uses one and clients another
   HBASE-492   hbase TRUNK does not build against hadoop TRUNK
   HBASE-496   impossible state for createLease writes 400k lines in about 15mins
   HBASE-472   Passing on edits, we dump all to log
   HBASE-495   No server address listed in .META.
   HBASE-433 HBASE-251 Region server should delete restore log after successful
               restore, Stuck replaying the edits of crashed machine.
   HBASE-27    hregioninfo cell empty in meta table
   HBASE-501   Empty region server address in info:server entry and a
               startcode of -1 in .META.
   HBASE-516   HStoreFile.finalKey does not update the final key if it is not
               the top region of a split region
   HBASE-525   HTable.getRow(Text) does not work (Clint Morgan via Bryan Duxbury)
   HBASE-524   Problems with getFull
   HBASE-528   table 'does not exist' when it does
   HBASE-531   Merge tool won't merge two overlapping regions (port HBASE-483 to
               trunk)
   HBASE-537   Wait for hdfs to exit safe mode
   HBASE-476   RegexpRowFilter behaves incorectly when there are multiple store
               files (Clint Morgan via Jim Kellerman)
   HBASE-527   RegexpRowFilter does not work when there are columns from 
               multiple families (Clint Morgan via Jim Kellerman)
   HBASE-534   Double-assignment at SPLIT-time
   HBASE-712   midKey found compacting is the first, not necessarily the optimal
   HBASE-719   Find out why users have network problems in HBase and not in Hadoop
               and HConnectionManager (Jean-Daniel Cryans via Stack)
   HBASE-703   Invalid regions listed by regionserver.jsp (Izaak Rubin via Stack)
   HBASE-674   Memcache size unreliable
   HBASE-726   Unit tests won't run because of a typo (Sebastien Rainville via Stack)
   HBASE-727   Client caught in an infinite loop when trying to connect to cached
               server locations (Izaak Rubin via Stack)
   HBASE-732   shell formatting error with the describe command
               (Izaak Rubin via Stack)
   HBASE-731   delete, deletefc in HBase shell do not work correctly
               (Izaak Rubin via Stack)
   HBASE-734   scan '.META.', {LIMIT => 10} crashes (Izaak Rubin via Stack)
   HBASE-736   Should have HTable.deleteAll(String row) and HTable.deleteAll(Text row)
               (Jean-Daniel Cryans via Stack)
   HBASE-740   ThriftServer getting table names incorrectly (Tim Sell via Stack)
   HBASE-742   Rename getMetainfo in HTable as getTableDescriptor
   HBASE-739   HBaseAdmin.createTable() using old HTableDescription doesn't work
               (Izaak Rubin via Stack)
   HBASE-744   BloomFilter serialization/deserialization broken
   HBASE-742   Column length limit is not enforced (Jean-Daniel Cryans via Stack)
   HBASE-737   Scanner: every cell in a row has the same timestamp
   HBASE-700   hbase.io.index.interval need be configuratable in column family
               (Andrew Purtell via Stack)
   HBASE-62    Allow user add arbitrary key/value pairs to table and column
               descriptors (Andrew Purtell via Stack)
   HBASE-34    Set memcache flush size per column (Andrew Purtell via Stack)
   HBASE-42    Set region split size on table creation (Andrew Purtell via Stack)
   HBASE-43    Add a read-only attribute to columns (Andrew Purtell via Stack)
   HBASE-424   Should be able to enable/disable .META. table
   HBASE-679   Regionserver addresses are still not right in the new tables page
   HBASE-758   Throwing IOE read-only when should be throwing NSRE
   HBASE-743   bin/hbase migrate upgrade fails when redo logs exists
   HBASE-754   The JRuby shell documentation is wrong in "get" and "put"
               (Jean-Daniel Cryans via Stack)
   HBASE-756   In HBase shell, the put command doesn't process the timestamp
               (Jean-Daniel Cryans via Stack)
   HBASE-757   REST mangles table names (Sishen via Stack)
   HBASE-706   On OOME, regionserver sticks around and doesn't go down with cluster
               (Jean-Daniel Cryans via Stack)
   HBASE-759   TestMetaUtils failing on hudson
   HBASE-761   IOE: Stream closed exception all over logs
   HBASE-763   ClassCastException from RowResult.get(String)
               (Andrew Purtell via Stack)
   HBASE-764   The name of column request has padding zero using REST interface
               (Sishen Freecity via Stack)
   HBASE-750   NPE caused by StoreFileScanner.updateReaders
   HBASE-769   TestMasterAdmin fails throwing RegionOfflineException when we're
               expecting IllegalStateException
   HBASE-766   FileNotFoundException trying to load HStoreFile 'data'
   HBASE-770   Update HBaseRPC to match hadoop 0.17 RPC
   HBASE-780   Can't scan '.META.' from new shell
   HBASE-424   Should be able to enable/disable .META. table
   HBASE-771   Names legal in 0.1 are not in 0.2; breaks migration
   HBASE-788   Div by zero in Master.jsp (Clint Morgan via Jim Kellerman)
   HBASE-791   RowCount doesn't work (Jean-Daniel Cryans via Stack)
   HBASE-751   dfs exception and regionserver stuck during heavy write load
   HBASE-793   HTable.getStartKeys() ignores table names when matching columns
               (Andrew Purtell and Dru Jensen via Stack)
   HBASE-790   During import, single region blocks requests for >10 minutes,
               thread dumps, throws out pending requests, and continues
               (Jonathan Gray via Stack)
   
  IMPROVEMENTS
   HBASE-559   MR example job to count table rows
   HBASE-596   DemoClient.py (Ivan Begtin via Stack)
   HBASE-581   Allow adding filters to TableInputFormat (At same time, ensure TIF
               is subclassable) (David Alves via Stack)
   HBASE-603   When an exception bubbles out of getRegionServerWithRetries, wrap 
               the exception with a RetriesExhaustedException
   HBASE-600   Filters have excessive DEBUG logging
   HBASE-611   regionserver should do basic health check before reporting
               alls-well to the master
   HBASE-614   Retiring regions is not used; exploit or remove
   HBASE-538   Improve exceptions that come out on client-side
   HBASE-569   DemoClient.php (Jim R. Wilson via Stack)
   HBASE-522   Where new Text(string) might be used in client side method calls,
               add an overload that takes String (Done as part of HBASE-82)
   HBASE-570   Remove HQL unit test (Done as part of HBASE-82 commit).
   HBASE-626   Use Visitor pattern in MetaRegion to reduce code clones in HTable
               and HConnectionManager (Jean-Daniel Cryans via Stack)
   HBASE-621   Make MAX_VERSIONS work like TTL: In scans and gets, check
               MAX_VERSIONs setting and return that many only rather than wait on
               compaction (Jean-Daniel Cryans via Stack)
   HBASE-504   Allow HMsg's carry a payload: e.g. exception that happened over
               on the remote side.
   HBASE-583   RangeRowFilter/ColumnValueFilter to allow choice of rows based on
               a (lexicographic) comparison to column's values
               (Clint Morgan via Stack)
   HBASE-579   Add hadoop 0.17.x
   HBASE-660   [Migration] addColumn/deleteColumn functionality in MetaUtils
   HBASE-632   HTable.getMetadata is very inefficient
   HBASE-671   New UI page displaying all regions in a table should be sorted
   HBASE-672   Sort regions in the regionserver UI
   HBASE-677   Make HTable, HRegion, HRegionServer, HStore, and HColumnDescriptor
               subclassable (Clint Morgan via Stack)
   HBASE-682   Regularize toString
   HBASE-672   Sort regions in the regionserver UI
   HBASE-469   Streamline HStore startup and compactions
   HBASE-544   Purge startUpdate from internal code and test cases
   HBASE-557   HTable.getRow() should receive RowResult objects
   HBASE-452   "region offline" should throw IOException, not IllegalStateException
   HBASE-541   Update hadoop jars.
   HBASE-523   package-level javadoc should have example client
   HBASE-415   Rewrite leases to use DelayedBlockingQueue instead of polling
   HBASE-35    Make BatchUpdate public in the API
   HBASE-409   Add build path to svn:ignore list (Edward Yoon via Stack)
   HBASE-408   Add .classpath and .project to svn:ignore list
               (Edward Yoon via Stack)
   HBASE-410   Speed up the test suite (make test timeout 5 instead of 15 mins).
   HBASE-281   Shell should allow deletions in .META. and -ROOT- tables
               (Edward Yoon & Bryan Duxbury via Stack)
   HBASE-56    Unnecessary HQLClient Object creation in a shell loop
               (Edward Yoon via Stack)
   HBASE-3     rest server: configure number of threads for jetty
               (Bryan Duxbury via Stack)
   HBASE-416   Add apache-style logging to REST server and add setting log
               level, etc.
   HBASE-406   Remove HTable and HConnection close methods
               (Bryan Duxbury via Stack)
   HBASE-418   Move HMaster and related classes into master package
               (Bryan Duxbury via Stack)
   HBASE-410   Speed up the test suite - Apparently test timeout was too
               aggressive for Hudson. TestLogRolling timed out even though it
               was operating properly. Change test timeout to 10 minutes.
   HBASE-436   website: http://hadoop.apache.org/hbase
   HBASE-417   Factor TableOperation and subclasses into separate files from
               HMaster (Bryan Duxbury via Stack)
   HBASE-440   Add optional log roll interval so that log files are garbage
               collected
   HBASE-407   Keep HRegionLocation information in LRU structure 
   HBASE-444   hbase is very slow at determining table is not present
   HBASE-438   XMLOutputter state should be initialized.
   HBASE-414   Move client classes into client package
   HBASE-79    When HBase needs to be migrated, it should display a message on
               stdout, not just in the logs
   HBASE-461   Simplify leases.
   HBASE-419   Move RegionServer and related classes into regionserver package
   HBASE-457   Factor Master into Master, RegionManager, and ServerManager
   HBASE-464   HBASE-419 introduced javadoc errors
   HBASE-468   Move HStoreKey back to o.a.h.h
   HBASE-442   Move internal classes out of HRegionServer
   HBASE-466   Move HMasterInterface, HRegionInterface, and 
               HMasterRegionInterface into o.a.h.h.ipc
   HBASE-479   Speed up TestLogRolling
   HBASE-480   Tool to manually merge two regions
   HBASE-477   Add support for an HBASE_CLASSPATH
   HBASE-443   Move internal classes out of HStore
   HBASE-515   At least double default timeouts between regionserver and master
   HBASE-529   RegionServer needs to recover if datanode goes down
   HBASE-456   Clearly state which ports need to be opened in order to run HBase
   HBASE-536   Remove MiniDFS startup from MiniHBaseCluster
   HBASE-521   Improve client scanner interface
   HBASE-562   Move Exceptions to subpackages (Jean-Daniel Cryans via Stack)
   HBASE-631   HTable.getRow() for only a column family
               (Jean-Daniel Cryans via Stack)
   HBASE-731   Add a meta refresh tag to the Web ui for master and region server
               (Jean-Daniel Cryans via Stack)
   HBASE-735   hbase shell doesn't trap CTRL-C signal (Jean-Daniel Cryans via Stack)
   HBASE-730   On startup, rinse STARTCODE and SERVER from .META.
               (Jean-Daniel Cryans via Stack)
   HBASE-738   overview.html in need of updating (Izaak Rubin via Stack)
   HBASE-745   scaling of one regionserver, improving memory and cpu usage (partial)
               (LN via Stack)
   HBASE-746   Batching row mutations via thrift (Tim Sell via Stack)
   HBASE-772   Up default lease period from 60 to 120 seconds
   HBASE-779   Test changing hbase.hregion.memcache.block.multiplier to 2
   HBASE-783   For single row, single family retrieval, getRow() works half
               as fast as getScanner().next() (Jean-Daniel Cryans via Stack)
   HBASE-789   add clover coverage report targets (Rong-en Fan via Stack)

  NEW FEATURES
   HBASE-47    Option to set TTL for columns in hbase
               (Andrew Purtell via Bryan Duxbury and Stack)
   HBASE-23    UI listing regions should be sorted by address and show additional
               region state (Jean-Daniel Cryans via Stack)
   HBASE-639   Add HBaseAdmin.getTableDescriptor function
   HBASE-533   Region Historian
   HBASE-487   Replace hql w/ a hbase-friendly jirb or jython shell
   HBASE-548   Tool to online single region
   HBASE-71    Master should rebalance region assignments periodically
   HBASE-512   Add configuration for global aggregate memcache size
   HBASE-40    Add a method of getting multiple (but not all) cells for a row
               at once
   HBASE-506   When an exception has to escape ServerCallable due to exhausted
               retries, show all the exceptions that lead to this situation
   HBASE-747   Add a simple way to do batch updates of many rows (Jean-Daniel
               Cryans via JimK)
   HBASE-733   Enhance Cell so that it can contain multiple values at multiple
               timestamps
   HBASE-511   Do exponential backoff in clients on NSRE, WRE, ISE, etc.
               (Andrew Purtell via Jim Kellerman)
   
  OPTIMIZATIONS
   HBASE-430   Performance: Scanners and getRow return maps with duplicate data

Release 0.1.3 - 07/25/2008

  BUG FIXES
   HBASE-644   DroppedSnapshotException but RegionServer doesn't restart
   HBASE-645   EOFException opening region (HBASE-550 redux)
   HBASE-641   Improve master split logging
   HBASE-642   Splitting log in a hostile environment -- bad hdfs -- we drop
               write-ahead-log edits
   HBASE-646   EOFException opening HStoreFile info file (spin on HBASE-645 and 550)
   HBASE-648   If mapfile index is empty, run repair
   HBASE-659   HLog#cacheFlushLock not cleared; hangs a region
   HBASE-663   Incorrect sequence number for cache flush
   HBASE-652   Dropping table fails silently if table isn't disabled 
   HBASE-674   Memcache size unreliable
   HBASE-665   server side scanner doesn't honor stop row
   HBASE-681   NPE in Memcache (Clint Morgan via Jim Kellerman)
   HBASE-680   config parameter hbase.io.index.interval should be
               hbase.index.interval, accroding to HBaseMapFile.HbaseWriter
               (LN via Stack)
   HBASE-684   unnecessary iteration in HMemcache.internalGet? got much better
               reading performance after break it (LN via Stack)
   HBASE-686   MemcacheScanner didn't return the first row(if it exists),
               because HScannerInterface's output incorrect (LN via Jim Kellerman)
   HBASE-613   Timestamp-anchored scanning fails to find all records
   HBASE-709   Deadlock while rolling WAL-log while finishing flush
   HBASE-707   High-load import of data into single table/family never triggers split
   HBASE-710   If clocks are way off, then we can have daughter split come
               before rather than after its parent in .META.

Release 0.1.2 - 05/13/2008

  BUG FIXES
   HBASE-577   NPE getting scanner
   HBASE-574   HBase does not load hadoop native libs (Rong-En Fan via Stack).
   HBASE-11    Unexpected exits corrupt DFS - best we can do until we have at
               least a subset of HADOOP-1700
   HBASE-573   HBase does not read hadoop-*.xml for dfs configuration after
               moving out hadoop/contrib
   HBASE-12    when hbase regionserver restarts, it says "impossible state for
               createLease()"
   HBASE-575   master dies with stack overflow error if rootdir isn't qualified
   HBASE-500   Regionserver stuck on exit
   HBASE-582   HBase 554 forgot to clear results on each iteration caused by a filter
               (Clint Morgan via Stack)
   HBASE-532   Odd interaction between HRegion.get, HRegion.deleteAll and compactions
   HBASE-590   HBase migration tool does not get correct FileSystem or root
               directory if configuration is not correct
   HBASE-595   RowFilterInterface.rowProcessed() is called *before* fhe final
               filtering decision is made (Clint Morgan via Stack)
   HBASE-586   HRegion runs HStore memcache snapshotting -- fix it so only HStore
               knows about workings of memcache
   HBASE-572   Backport HBASE-512 to 0.1 branch
   HBASE-588   Still a 'hole' in scanners, even after HBASE-532
   HBASE-604   Don't allow CLASSPATH from environment pollute the hbase CLASSPATH
   HBASE-608   HRegionServer::getThisIP() checks hadoop config var for dns interface name
               (Jim R. Wilson via Stack)
   HBASE-609   Master doesn't see regionserver edits because of clock skew
   HBASE-607   MultiRegionTable.makeMultiRegionTable is not deterministic enough
               for regression tests
   HBASE-478   offlining of table does not run reliably
   HBASE-618   We always compact if 2 files, regardless of the compaction threshold setting
   HBASE-619   Fix 'logs' link in UI
   HBASE-620   testmergetool failing in branch and trunk since hbase-618 went in
   
  IMPROVEMENTS
   HBASE-559   MR example job to count table rows
   HBASE-578   Upgrade branch to 0.16.3 hadoop.
   HBASE-596   DemoClient.py (Ivan Begtin via Stack)


Release 0.1.1 - 04/11/2008

  BUG FIXES
   HBASE-550   EOF trying to read reconstruction log stops region deployment
   HBASE-551   Master stuck splitting server logs in shutdown loop; on each
               iteration, edits are aggregated up into the millions
   HBASE-505   Region assignments should never time out so long as the region
               server reports that it is processing the open request
   HBASE-552   Fix bloom filter bugs (Andrzej Bialecki via Jim Kellerman)
   HBASE-507   Add sleep between retries
   HBASE-555   Only one Worker in HRS; on startup, if assigned tens of regions,
               havoc of reassignments because open processing is done in series
   HBASE-547   UI shows hadoop version, not hbase version
   HBASE-561   HBase package does not include LICENSE.txt nor build.xml
   HBASE-556   Add 0.16.2 to hbase branch -- if it works
   HBASE-563   TestRowFilterAfterWrite erroneously sets master address to
               0.0.0.0:60100 rather than relying on conf
   HBASE-554   filters generate StackOverflowException (Clint Morgan via
               Jim Kellerman)
   HBASE-567   Reused BatchUpdate instances accumulate BatchOperations

  NEW FEATURES
   HBASE-548   Tool to online single region

Release 0.1.0

  INCOMPATIBLE CHANGES
   HADOOP-2750 Deprecated methods startBatchUpdate, commitBatch, abortBatch, 
               and renewLease have been removed from HTable (Bryan Duxbury via
               Jim Kellerman)
   HADOOP-2786 Move hbase out of hadoop core
   HBASE-403   Fix build after move of hbase in svn
   HBASE-494   Up IPC version on 0.1 branch so we cannot mistakenly connect
               with a hbase from 0.16.0

  NEW FEATURES
   HBASE-506   When an exception has to escape ServerCallable due to exhausted retries, 
               show all the exceptions that lead to this situation

  OPTIMIZATIONS

  BUG FIXES
   HADOOP-2731 Under load, regions become extremely large and eventually cause
               region servers to become unresponsive
   HADOOP-2693 NPE in getClosestRowBefore (Bryan Duxbury & Stack)
   HADOOP-2599 Some minor improvements to changes in HADOOP-2443
               (Bryan Duxbury & Stack)
   HADOOP-2773 Master marks region offline when it is recovering from a region
               server death
   HBASE-425   Fix doc. so it accomodates new hbase untethered context
   HBase-421   TestRegionServerExit broken
   HBASE-426   hbase can't find remote filesystem
   HBASE-446   Fully qualified hbase.rootdir doesn't work
   HBASE-428   Under continuous upload of rows, WrongRegionExceptions are
               thrown that reach the client even after retries
   HBASE-490   Doubly-assigned .META.; master uses one and clients another
   HBASE-496   impossible state for createLease writes 400k lines in about 15mins
   HBASE-472   Passing on edits, we dump all to log
   HBASE-79    When HBase needs to be migrated, it should display a message on
               stdout, not just in the logs
   HBASE-495   No server address listed in .META.
   HBASE-433 HBASE-251 Region server should delete restore log after successful
               restore, Stuck replaying the edits of crashed machine.
   HBASE-27    hregioninfo cell empty in meta table
   HBASE-501   Empty region server address in info:server entry and a
               startcode of -1 in .META.
   HBASE-516   HStoreFile.finalKey does not update the final key if it is not
               the top region of a split region
   HBASE-524   Problems with getFull
   HBASE-514   table 'does not exist' when it does
   HBASE-537   Wait for hdfs to exit safe mode
   HBASE-534   Double-assignment at SPLIT-time
   
  IMPROVEMENTS
   HADOOP-2555 Refactor the HTable#get and HTable#getRow methods to avoid
               repetition of retry-on-failure logic (thanks to Peter Dolan and
               Bryan Duxbury)
   HBASE-281   Shell should allow deletions in .META. and -ROOT- tables
   HBASE-480   Tool to manually merge two regions
   HBASE-477   Add support for an HBASE_CLASSPATH
   HBASE-515   At least double default timeouts between regionserver and master
   HBASE-482   package-level javadoc should have example client or at least 
               point at the FAQ
   HBASE-497   RegionServer needs to recover if datanode goes down
   HBASE-456   Clearly state which ports need to be opened in order to run HBase
   HBASE-483   Merge tool won't merge two overlapping regions
   HBASE-476   RegexpRowFilter behaves incorectly when there are multiple store
               files (Clint Morgan via Jim Kellerman)
   HBASE-527   RegexpRowFilter does not work when there are columns from 
               multiple families (Clint Morgan via Jim Kellerman)
              
Release 0.16.0

  2008/02/04   HBase is now a subproject of Hadoop. The first HBase release as
               a subproject will be release 0.1.0 which will be equivalent to
               the version of HBase included in Hadoop 0.16.0. In order to
               accomplish this, the HBase portion of HBASE-288 (formerly 
               HADOOP-1398) has been backed out. Once 0.1.0 is frozen (depending
               mostly on changes to infrastructure due to becoming a sub project
               instead of a contrib project), this patch will re-appear on HBase
               trunk.

  INCOMPATIBLE CHANGES
   HADOOP-2056 A table with row keys containing colon fails to split regions
   HADOOP-2079 Fix generated HLog, HRegion names
   HADOOP-2495 Minor performance improvements: Slim-down BatchOperation, etc. 
   HADOOP-2506 Remove the algebra package
   HADOOP-2519 Performance improvements: Customized RPC serialization
   HADOOP-2478 Restructure how HBase lays out files in the file system (phase 1)
               (test input data)
   HADOOP-2478 Restructure how HBase lays out files in the file system (phase 2)
               Includes migration tool org.apache.hadoop.hbase.util.Migrate
   HADOOP-2558 org.onelab.filter.BloomFilter class uses 8X the memory it should
               be using

  NEW FEATURES
    HADOOP-2061 Add new Base64 dialects
    HADOOP-2084 Add a LocalHBaseCluster
    HADOOP-2068 RESTful interface (Bryan Duxbury via Stack)
    HADOOP-2316 Run REST servlet outside of master
                (Bryan Duxbury & Stack)
    HADOOP-1550 No means of deleting a'row' (Bryan Duxbuery via Stack)
    HADOOP-2384 Delete all members of a column family on a specific row
                (Bryan Duxbury via Stack)
    HADOOP-2395 Implement "ALTER TABLE ... CHANGE column" operation
                (Bryan Duxbury via Stack)
    HADOOP-2240 Truncate for hbase (Edward Yoon via Stack)
    HADOOP-2389 Provide multiple language bindings for HBase (Thrift)
                (David Simpson via Stack)

  OPTIMIZATIONS
   HADOOP-2479 Save on number of Text object creations
   HADOOP-2485 Make mapfile index interval configurable (Set default to 32
               instead of 128)
   HADOOP-2553 Don't make Long objects calculating hbase type hash codes
   HADOOP-2377 Holding open MapFile.Readers is expensive, so use less of them
   HADOOP-2407 Keeping MapFile.Reader open is expensive: Part 2
   HADOOP-2533 Performance: Scanning, just creating MapWritable in next
               consumes >20% CPU
   HADOOP-2443 Keep lazy cache of regions in client rather than an
               'authoritative' list (Bryan Duxbury via Stack)
   HADOOP-2600 Performance: HStore.getRowKeyAtOrBefore should use
               MapFile.Reader#getClosest (before)
               (Bryan Duxbury via Stack)

  BUG FIXES
   HADOOP-2059 In tests, exceptions in min dfs shutdown should not fail test
               (e.g. nightly #272)
   HADOOP-2064 TestSplit assertion and NPE failures (Patch build #952 and #953)
   HADOOP-2124 Use of `hostname` does not work on Cygwin in some cases
   HADOOP-2083 TestTableIndex failed in #970 and #956
   HADOOP-2109 Fixed race condition in processing server lease timeout.
   HADOOP-2137 hql.jsp : The character 0x19 is not valid
   HADOOP-2109 Fix another race condition in processing dead servers,
               Fix error online meta regions: was using region name and not
               startKey as key for map.put. Change TestRegionServerExit to
               always kill the region server for the META region. This makes
               the test more deterministic and getting META reassigned was
               problematic.
   HADOOP-2155 Method expecting HBaseConfiguration throws NPE when given Configuration
   HADOOP-2156 BufferUnderflowException for un-named HTableDescriptors
   HADOOP-2161 getRow() is orders of magnitudes slower than get(), even on rows
               with one column (Clint Morgan and Stack)
   HADOOP-2040 Hudson hangs AFTER test has finished
   HADOOP-2274 Excess synchronization introduced by HADOOP-2139 negatively
               impacts performance
   HADOOP-2196 Fix how hbase sits in hadoop 'package' product
   HADOOP-2276 Address regression caused by HADOOP-2274, fix HADOOP-2173 (When
               the master times out a region servers lease, the region server
               may not restart)
   HADOOP-2253 getRow can return HBASE::DELETEVAL cells
               (Bryan Duxbury via Stack)
   HADOOP-2295 Fix assigning a region to multiple servers
   HADOOP-2234 TableInputFormat erroneously aggregates map values
   HADOOP-2308 null regioninfo breaks meta scanner
   HADOOP-2304 Abbreviated symbol parsing error of dir path in jar command
               (Edward Yoon via Stack)
   HADOOP-2320 Committed TestGet2 is managled (breaks build).
   HADOOP-2322 getRow(row, TS) client interface not properly connected
   HADOOP-2309 ConcurrentModificationException doing get of all region start keys
   HADOOP-2321 TestScanner2 does not release resources which sometimes cause the
               test to time out
   HADOOP-2315 REST servlet doesn't treat / characters in row key correctly
               (Bryan Duxbury via Stack)
   HADOOP-2332 Meta table data selection in Hbase Shell
               (Edward Yoon via Stack)
   HADOOP-2347 REST servlet not thread safe but run in a threaded manner
               (Bryan Duxbury via Stack)
   HADOOP-2365 Result of HashFunction.hash() contains all identical values
   HADOOP-2362 Leaking hdfs file handle on region split
   HADOOP-2338 Fix NullPointerException in master server.
   HADOOP-2380 REST servlet throws NPE when any value node has an empty string
               (Bryan Duxbury via Stack)
   HADOOP-2350 Scanner api returns null row names, or skips row names if
               different column families do not have entries for some rows
   HADOOP-2283 AlreadyBeingCreatedException (Was: Stuck replay of failed
               regionserver edits)
   HADOOP-2392 TestRegionServerExit has new failure mode since HADOOP-2338
   HADOOP-2324 Fix assertion failures in TestTableMapReduce
   HADOOP-2396 NPE in HMaster.cancelLease
   HADOOP-2397 The only time that a meta scanner should try to recover a log is
               when the master is starting
   HADOOP-2417 Fix critical shutdown problem introduced by HADOOP-2338
   HADOOP-2418 Fix assertion failures in TestTableMapReduce, TestTableIndex,
               and TestTableJoinMapReduce
   HADOOP-2414 Fix ArrayIndexOutOfBoundsException in bloom filters.
   HADOOP-2430 Master will not shut down if there are no active region servers
   HADOOP-2199 Add tools for going from hregion filename to region name in logs
   HADOOP-2441 Fix build failures in TestHBaseCluster
   HADOOP-2451 End key is incorrectly assigned in many region splits
   HADOOP-2455 Error in Help-string of CREATE command (Edward Yoon via Stack)
   HADOOP-2465 When split parent regions are cleaned up, not all the columns are
               deleted
   HADOOP-2468 TestRegionServerExit failed in Hadoop-Nightly #338
   HADOOP-2467 scanner truncates resultset when > 1 column families
   HADOOP-2503 REST Insert / Select encoding issue (Bryan Duxbury via Stack)
   HADOOP-2505 formatter classes missing apache license
   HADOOP-2504 REST servlet method for deleting a scanner was not properly
               mapped (Bryan Duxbury via Stack)
   HADOOP-2507 REST servlet does not properly base64 row keys and column names
               (Bryan Duxbury via Stack)
   HADOOP-2530 Missing type in new hbase custom RPC serializer
   HADOOP-2490 Failure in nightly #346 (Added debugging of hudson failures).
   HADOOP-2558 fixes for build up on hudson (part 1, part 2, part 3, part 4)
   HADOOP-2500 Unreadable region kills region servers
   HADOOP-2579 Initializing a new HTable object against a nonexistent table
               throws a NoServerForRegionException instead of a
               TableNotFoundException when a different table has been created
               previously (Bryan Duxbury via Stack)
   HADOOP-2587 Splits blocked by compactions cause region to be offline for
               duration of compaction. 
   HADOOP-2592 Scanning, a region can let out a row that its not supposed
               to have
   HADOOP-2493 hbase will split on row when the start and end row is the
               same cause data loss (Bryan Duxbury via Stack)
   HADOOP-2629 Shell digests garbage without complaint
   HADOOP-2619 Compaction errors after a region splits
   HADOOP-2621 Memcache flush flushing every 60 secs with out considering
               the max memcache size
   HADOOP-2584 Web UI displays an IOException instead of the Tables
   HADOOP-2650 Remove Writables.clone and use WritableUtils.clone from
               hadoop instead
   HADOOP-2668 Documentation and improved logging so fact that hbase now
               requires migration comes as less of a surprise
   HADOOP-2686 Removed tables stick around in .META.
   HADOOP-2688 IllegalArgumentException processing a shutdown stops
               server going down and results in millions of lines of output
   HADOOP-2706 HBase Shell crash
   HADOOP-2712 under load, regions won't split
   HADOOP-2675 Options not passed to rest/thrift
   HADOOP-2722 Prevent unintentional thread exit in region server and master
   HADOOP-2718 Copy Constructor HBaseConfiguration(Configuration) will override
               hbase configurations if argumant is not an instance of
               HBaseConfiguration.
   HADOOP-2753 Back out 2718; programmatic config works but hbase*xml conf
               is overridden
   HADOOP-2718 Copy Constructor HBaseConfiguration(Configuration) will override
               hbase configurations if argumant is not an instance of
               HBaseConfiguration (Put it back again).
   HADOOP-2631 2443 breaks HTable.getStartKeys when there is more than one
               table or table you are enumerating isn't the first table
   Delete empty file: src/contrib/hbase/src/java/org/apache/hadoop/hbase/mapred/
               TableOutputCollector.java per Nigel Daley
   
  IMPROVEMENTS
   HADOOP-2401 Add convenience put method that takes writable
               (Johan Oskarsson via Stack)
   HADOOP-2074 Simple switch to enable DEBUG level-logging in hbase
   HADOOP-2088 Make hbase runnable in $HADOOP_HOME/build(/contrib/hbase)
   HADOOP-2126 Use Bob Jenkins' hash for bloom filters
   HADOOP-2157 Make Scanners implement Iterable
   HADOOP-2176 Htable.deleteAll documentation is ambiguous
   HADOOP-2139 (phase 1) Increase parallelism in region servers.
   HADOOP-2267 [Hbase Shell] Change the prompt's title from 'hbase' to 'hql'.
               (Edward Yoon via Stack)
   HADOOP-2139 (phase 2) Make region server more event driven
   HADOOP-2289 Useless efforts of looking for the non-existant table in select
               command.
               (Edward Yoon via Stack)
   HADOOP-2257 Show a total of all requests and regions on the web ui
               (Paul Saab via Stack)
   HADOOP-2261 HTable.abort no longer throws exception if there is no active update.
   HADOOP-2287 Make hbase unit tests take less time to complete.
   HADOOP-2262 Retry n times instead of n**2 times.
   HADOOP-1608 Relational Algrebra Operators
               (Edward Yoon via Stack)
   HADOOP-2198 HTable should have method to return table metadata
   HADOOP-2296 hbase shell: phantom columns show up from select command
   HADOOP-2297 System.exit() Handling in hbase shell jar command
               (Edward Yoon via Stack)
   HADOOP-2224 Add HTable.getRow(ROW, ts)
               (Bryan Duxbury via Stack)
   HADOOP-2339 Delete command with no WHERE clause
               (Edward Yoon via Stack)
   HADOOP-2299 Support inclusive scans (Bryan Duxbury via Stack)
   HADOOP-2333 Client side retries happen at the wrong level
   HADOOP-2357 Compaction cleanup; less deleting + prevent possible file leaks
   HADOOP-2392 TestRegionServerExit has new failure mode since HADOOP-2338
   HADOOP-2370 Allow column families with an unlimited number of versions
               (Edward Yoon via Stack)
   HADOOP-2047 Add an '--master=X' and '--html' command-line parameters to shell
               (Edward Yoon via Stack)
   HADOOP-2351 If select command returns no result, it doesn't need to show the
               header information (Edward Yoon via Stack)
   HADOOP-2285 Add being able to shutdown regionservers (Dennis Kubes via Stack)
   HADOOP-2458 HStoreFile.writeSplitInfo should just call 
               HStoreFile.Reference.write
   HADOOP-2471 Add reading/writing MapFile to PerformanceEvaluation suite
   HADOOP-2522 Separate MapFile benchmark from PerformanceEvaluation
               (Tom White via Stack)
   HADOOP-2502 Insert/Select timestamp, Timestamp data type in HQL
               (Edward Yoon via Stack)
   HADOOP-2450 Show version (and svn revision) in hbase web ui
   HADOOP-2472 Range selection using filter (Edward Yoon via Stack)
   HADOOP-2548 Make TableMap and TableReduce generic
               (Frederik Hedberg via Stack)
   HADOOP-2557 Shell count function (Edward Yoon via Stack)
   HADOOP-2589 Change an classes/package name from Shell to hql
               (Edward Yoon via Stack)
   HADOOP-2545 hbase rest server should be started with hbase-daemon.sh
   HADOOP-2525 Same 2 lines repeated 11 million times in HMaster log upon
               HMaster shutdown
   HADOOP-2616 hbase not spliting when the total size of region reaches max
               region size * 1.5
   HADOOP-2643 Make migration tool smarter.
   
Release 0.15.1
Branch 0.15

  INCOMPATIBLE CHANGES
    HADOOP-1931 Hbase scripts take --ARG=ARG_VALUE when should be like hadoop
                and do ---ARG ARG_VALUE

  NEW FEATURES
    HADOOP-1768 FS command using Hadoop FsShell operations
                (Edward Yoon via Stack)
    HADOOP-1784 Delete: Fix scanners and gets so they work properly in presence
                of deletes. Added a deleteAll to remove all cells equal to or
                older than passed timestamp.  Fixed compaction so deleted cells
                do not make it out into compacted output.  Ensure also that
                versions > column max are dropped compacting.
    HADOOP-1720 Addition of HQL (Hbase Query Language) support in Hbase Shell.
                The old shell syntax has been replaced by HQL, a small SQL-like
                set of operators, for creating, altering, dropping, inserting,
                deleting, and selecting, etc., data in hbase.
                (Inchul Song and Edward Yoon via Stack)
    HADOOP-1913 Build a Lucene index on an HBase table
                (Ning Li via Stack)
    HADOOP-1957 Web UI with report on cluster state and basic browsing of tables

  OPTIMIZATIONS

  BUG FIXES
    HADOOP-1527 Region server won't start because logdir exists
    HADOOP-1723 If master asks region server to shut down, by-pass return of
                shutdown message
    HADOOP-1729 Recent renaming or META tables breaks hbase shell
    HADOOP-1730 unexpected null value causes META scanner to exit (silently)
    HADOOP-1747 On a cluster, on restart, regions multiply assigned
    HADOOP-1776 Fix for sporadic compaction failures closing and moving
                compaction result
    HADOOP-1780 Regions are still being doubly assigned
    HADOOP-1797 Fix NPEs in MetaScanner constructor
    HADOOP-1799 Incorrect classpath in binary version of Hadoop
    HADOOP-1805 Region server hang on exit
    HADOOP-1785 TableInputFormat.TableRecordReader.next has a bug
                (Ning Li via Stack)
    HADOOP-1800 output should default utf8 encoding
    HADOOP-1801 When hdfs is yanked out from under hbase, hbase should go down gracefully
    HADOOP-1813 OOME makes zombie of region server
    HADOOP-1814	TestCleanRegionServerExit fails too often on Hudson
    HADOOP-1820 Regionserver creates hlogs without bound
                (reverted 2007/09/25) (Fixed 2007/09/30)
    HADOOP-1821 Replace all String.getBytes() with String.getBytes("UTF-8")
    HADOOP-1832 listTables() returns duplicate tables
    HADOOP-1834 Scanners ignore timestamp passed on creation
    HADOOP-1847 Many HBase tests do not fail well.
    HADOOP-1847 Many HBase tests do not fail well. (phase 2)
    HADOOP-1870 Once file system failure has been detected, don't check it again
                and get on with shutting down the hbase cluster.
    HADOOP-1888 NullPointerException in HMemcacheScanner (reprise)
    HADOOP-1903 Possible data loss if Exception happens between snapshot and
                flush to disk.
    HADOOP-1920 Wrapper scripts broken when hadoop in one location and hbase in
                another
    HADOOP-1923, HADOOP-1924 a) tests fail sporadically because set up and tear
                 down is inconsistent b) TestDFSAbort failed in nightly #242
    HADOOP-1929 Add hbase-default.xml to hbase jar
    HADOOP-1941 StopRowFilter throws NPE when passed null row
    HADOOP-1966 Make HBase unit tests more reliable in the Hudson environment.
    HADOOP-1975 HBase tests failing with java.lang.NumberFormatException
    HADOOP-1990 Regression test instability affects nightly and patch builds
    HADOOP-1996 TestHStoreFile fails on windows if run multiple times
    HADOOP-1937 When the master times out a region server's lease, it is too 
                aggressive in reclaiming the server's log.
    HADOOP-2004 webapp hql formatting bugs 
    HADOOP_2011 Make hbase daemon scripts take args in same order as hadoop
                daemon scripts
    HADOOP-2017 TestRegionServerAbort failure in patch build #903 and
                nightly #266
    HADOOP-2029 TestLogRolling fails too often in patch and nightlies
    HADOOP-2038 TestCleanRegionExit failed in patch build #927

  IMPROVEMENTS
    HADOOP-1737 Make HColumnDescriptor data publically members settable
    HADOOP-1746 Clean up findbugs warnings
    HADOOP-1757 Bloomfilters: single argument constructor, use enum for bloom
                filter types
    HADOOP-1760 Use new MapWritable and SortedMapWritable classes from
                org.apache.hadoop.io
    HADOOP-1793 (Phase 1) Remove TestHClient (Phase2) remove HClient.
    HADOOP-1794 Remove deprecated APIs
    HADOOP-1802 Startup scripts should wait until hdfs as cleared 'safe mode'
    HADOOP-1833 bin/stop_hbase.sh returns before it completes
                (Izaak Rubin via Stack) 
    HADOOP-1835 Updated Documentation for HBase setup/installation
                (Izaak Rubin via Stack)
    HADOOP-1868 Make default configuration more responsive
    HADOOP-1884 Remove useless debugging log messages from hbase.mapred
    HADOOP-1856 Add Jar command to hbase shell using Hadoop RunJar util
                (Edward Yoon via Stack)
    HADOOP-1928 Have master pass the regionserver the filesystem to use
    HADOOP-1789 Output formatting
    HADOOP-1960 If a region server cannot talk to the master before its lease
                times out, it should shut itself down
    HADOOP-2035 Add logo to webapps


Below are the list of changes before 2007-08-18

  1. HADOOP-1384. HBase omnibus patch. (jimk, Vuk Ercegovac, and Michael Stack)
  2. HADOOP-1402. Fix javadoc warnings in hbase contrib. (Michael Stack)
  3. HADOOP-1404. HBase command-line shutdown failing (Michael Stack)
  4. HADOOP-1397. Replace custom hbase locking with 
     java.util.concurrent.locks.ReentrantLock (Michael Stack)
  5. HADOOP-1403. HBase reliability - make master and region server more fault
     tolerant.
  6. HADOOP-1418. HBase miscellaneous: unit test for HClient, client to do
     'Performance Evaluation', etc.
  7. HADOOP-1420, HADOOP-1423. Findbugs changes, remove reference to removed 
     class HLocking.
  8. HADOOP-1424. TestHBaseCluster fails with IllegalMonitorStateException. Fix
     regression introduced by HADOOP-1397.
  9. HADOOP-1426. Make hbase scripts executable + add test classes to CLASSPATH.
 10. HADOOP-1430. HBase shutdown leaves regionservers up.
 11. HADOOP-1392. Part1: includes create/delete table; enable/disable table;
     add/remove column.
 12. HADOOP-1392. Part2: includes table compaction by merging adjacent regions
     that have shrunk in size.
 13. HADOOP-1445 Support updates across region splits and compactions
 14. HADOOP-1460 On shutdown IOException with complaint 'Cannot cancel lease
     that is not held'
 15. HADOOP-1421 Failover detection, split log files.
     For the files modified, also clean up javadoc, class, field and method 
     visibility (HADOOP-1466)
 16. HADOOP-1479 Fix NPE in HStore#get if store file only has keys < passed key.
 17. HADOOP-1476 Distributed version of 'Performance Evaluation' script
 18. HADOOP-1469 Asychronous table creation
 19. HADOOP-1415 Integrate BSD licensed bloom filter implementation.
 20. HADOOP-1465 Add cluster stop/start scripts for hbase
 21. HADOOP-1415 Provide configurable per-column bloom filters - part 2.
 22. HADOOP-1498. Replace boxed types with primitives in many places.
 23. HADOOP-1509.  Made methods/inner classes in HRegionServer and HClient protected
     instead of private for easier extension. Also made HRegion and HRegionInfo public too.
     Added an hbase-default.xml property for specifying what HRegionInterface extension to use
     for proxy server connection. (James Kennedy via Jim Kellerman)
 24. HADOOP-1534. [hbase] Memcache scanner fails if start key not present
 25. HADOOP-1537. Catch exceptions in testCleanRegionServerExit so we can see
     what is failing.
 26. HADOOP-1543 [hbase] Add HClient.tableExists
 27. HADOOP-1519 [hbase] map/reduce interface for HBase.  (Vuk Ercegovac and
     Jim Kellerman)
 28. HADOOP-1523 Hung region server waiting on write locks 
 29. HADOOP-1560 NPE in MiniHBaseCluster on Windows
 30. HADOOP-1531 Add RowFilter to HRegion.HScanner
     Adds a row filtering interface and two implemenentations: A page scanner,
     and a regex row/column-data matcher. (James Kennedy via Stack)
 31. HADOOP-1566 Key-making utility
 32. HADOOP-1415 Provide configurable per-column bloom filters. 
     HADOOP-1466 Clean up visibility and javadoc issues in HBase.
 33. HADOOP-1538 Provide capability for client specified time stamps in HBase
     HADOOP-1466 Clean up visibility and javadoc issues in HBase.
 34. HADOOP-1589 Exception handling in HBase is broken over client server connections
 35. HADOOP-1375 a simple parser for hbase (Edward Yoon via Stack)
 36. HADOOP-1600 Update license in HBase code
 37. HADOOP-1589 Exception handling in HBase is broken over client server
 38. HADOOP-1574 Concurrent creates of a table named 'X' all succeed
 39. HADOOP-1581 Un-openable tablename bug
 40. HADOOP-1607 [shell] Clear screen command (Edward Yoon via Stack)
 41. HADOOP-1614 [hbase] HClient does not protect itself from simultaneous updates
 42. HADOOP-1468 Add HBase batch update to reduce RPC overhead
 43. HADOOP-1616 Sporadic TestTable failures
 44. HADOOP-1615 Replacing thread notification-based queue with 
     java.util.concurrent.BlockingQueue in HMaster, HRegionServer
 45. HADOOP-1606 Updated implementation of RowFilterSet, RowFilterInterface
     (Izaak Rubin via Stack)
 46. HADOOP-1579 Add new WhileMatchRowFilter and StopRowFilter filters
    (Izaak Rubin via Stack)
 47. HADOOP-1637 Fix to HScanner to Support Filters, Add Filter Tests to
     TestScanner2 (Izaak Rubin via Stack)
 48. HADOOP-1516 HClient fails to readjust when ROOT or META redeployed on new
     region server
 49. HADOOP-1646 RegionServer OOME's under sustained, substantial loading by
     10 concurrent clients
 50. HADOOP-1468 Add HBase batch update to reduce RPC overhead (restrict batches
     to a single row at a time)
 51. HADOOP-1528 HClient for multiple tables (phase 1) (James Kennedy & JimK)
 52. HADOOP-1528 HClient for multiple tables (phase 2) all HBase client side code
     (except TestHClient and HBaseShell) have been converted to use the new client
     side objects (HTable/HBaseAdmin/HConnection) instead of HClient.
 53. HADOOP-1528 HClient for multiple tables - expose close table function
 54. HADOOP-1466 Clean up warnings, visibility and javadoc issues in HBase.
 55. HADOOP-1662 Make region splits faster
 56. HADOOP-1678 On region split, master should designate which host should 
     serve daughter splits. Phase 1: Master balances load for new regions and
     when a region server fails.
 57. HADOOP-1678 On region split, master should designate which host should 
     serve daughter splits. Phase 2: Master assigns children of split region
     instead of HRegionServer serving both children.
 58. HADOOP-1710 All updates should be batch updates
 59. HADOOP-1711 HTable API should use interfaces instead of concrete classes as
     method parameters and return values
 60. HADOOP-1644 Compactions should not block updates
 60. HADOOP-1672 HBase Shell should use new client classes
     (Edward Yoon via Stack).
 61. HADOOP-1709 Make HRegionInterface more like that of HTable
     HADOOP-1725 Client find of table regions should not include offlined, split parents