Hbase Change Log INCOMPATIBLE CHANGES 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) NEW FEATURES OPTIMIZATIONS BUG FIXES 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) IMPROVEMENTS 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 Branch 0.1 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 NEW FEATURES 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 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) 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 (Edward Yoon via Stack) 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