hbase/conf/hbase-default.xml

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<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!--
/**
* Copyright 2007 The Apache Software Foundation
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
-->
<configuration>
<property>
<name>hbase.rootdir</name>
<value>file:///tmp/hbase-${user.name}/hbase</value>
<description>The directory shared by region servers.
Should be fully-qualified to include the filesystem to use.
E.g: hdfs://NAMENODE_SERVER:PORT/HBASE_ROOTDIR
</description>
</property>
<property>
<name>hbase.master</name>
<value>local</value>
<description>The host and port that the HBase master runs at.
A value of 'local' runs the master and a regionserver in
a single process.
</description>
</property>
<property>
<name>hbase.master.info.port</name>
<value>60010</value>
<description>The port for the hbase master web UI
Set to -1 if you do not want the info server to run.
</description>
</property>
<property>
<name>hbase.master.info.bindAddress</name>
<value>0.0.0.0</value>
<description>The address for the hbase master web UI
</description>
</property>
<property>
<name>hbase.client.write.buffer</name>
<value>2097152</value>
<description>Size of the write buffer in bytes. A bigger buffer takes more
memory -- on both the client and server side since server instantiates
the passed write buffer to process it -- but reduces the number of RPC.
For an estimate of server-side memory-used, evaluate
hbase.client.write.buffer * hbase.regionserver.handler.count
</description>
</property>
<property>
<name>hbase.master.meta.thread.rescanfrequency</name>
<value>60000</value>
<description>How long the HMaster sleeps (in milliseconds) between scans of
the root and meta tables.
</description>
</property>
<property>
<name>hbase.master.lease.period</name>
<value>120000</value>
<description>HMaster server lease period in milliseconds. Default is
120 seconds. Region servers must report in within this period else
they are considered dead. On loaded cluster, may need to up this
period.</description>
</property>
<property>
<name>hbase.regionserver</name>
<value>0.0.0.0:60020</value>
<description>The host and port a HBase region server runs at.
</description>
</property>
<property>
<name>hbase.regionserver.dns.interface</name>
<value>default</value>
<description>Name of the network interface which a regionserver
should use to determine it's "real" IP address. This lookup
prevents strings like "localhost" and "127.0.0.1" from being
reported back to the master.
</description>
</property>
<property>
<name>hbase.regionserver.info.port</name>
<value>60030</value>
<description>The port for the hbase regionserver web UI
Set to -1 if you do not want the info server to run.
</description>
</property>
<property>
<name>hbase.regionserver.info.bindAddress</name>
<value>0.0.0.0</value>
<description>The address for the hbase regionserver web UI
</description>
</property>
<property>
<name>hbase.regionserver.class</name>
<value>org.apache.hadoop.hbase.ipc.HRegionInterface</value>
<description>An interface that is assignable to HRegionInterface. Used in HClient for
opening proxy to remote region server.
</description>
</property>
<property>
<name>hbase.client.pause</name>
<value>2000</value>
<description>General client pause value. Used mostly as value to wait
before running a retry of a failed get, region lookup, etc.</description>
</property>
<property>
<name>hbase.client.retries.number</name>
<value>10</value>
<description>Maximum retries. Used as maximum for all retryable
operations such as fetching of the root region from root region
server, getting a cell's value, starting a row update, etc.
Default: 10.
</description>
</property>
<property>
<name>hbase.client.scanner.caching</name>
<value>30</value>
<description>Number of rows that will be fetched when calling next
on a scanner if it is not served from memory. Higher caching values
will enable faster scanners but will eat up more memory and some
calls of next may take longer and longer times when the cache is empty.
</description>
</property>
<property>
<name>hbase.regionserver.lease.period</name>
<value>60000</value>
<description>HRegion server lease period in milliseconds. Default is
60 seconds. Clients must report in within this period else they are
considered dead.</description>
</property>
<property>
<name>hbase.regionserver.handler.count</name>
<value>10</value>
<description>Count of RPC Server instances spun up on RegionServers
Same property is used by the HMaster for count of master handlers.
Default is 10.
</description>
</property>
<property>
<name>hbase.regionserver.msginterval</name>
<value>3000</value>
<description>Interval between messages from the RegionServer to HMaster
in milliseconds. Default is 3 seconds.
</description>
</property>
<property>
<name>hbase.regionserver.maxlogentries</name>
<value>100000</value>
<description>Rotate the HRegion HLogs when count of entries exceeds this
value. Default: 100,000. Value is checked by a thread that runs every
hbase.server.thread.wakefrequency.
</description>
</property>
<property>
<name>hbase.regionserver.flushlogentries</name>
<value>100</value>
<description>Sync the HLog to the HDFS when it has accumulated this many
entries. Default 100. Value is checked on every HLog.append
</description>
</property>
<property>
<name>hbase.regionserver.optionallogflushinterval</name>
<value>10000</value>
<description>Sync the HLog to the HDFS after this interval if it has not
accumulated enough entries to trigger a sync. Default 10 seconds. Units:
milliseconds.
</description>
</property>
<property>
<name>hbase.regionserver.thread.splitcompactcheckfrequency</name>
<value>20000</value>
<description>How often a region server runs the split/compaction check.
</description>
</property>
<property>
<name>hbase.regionserver.nbreservationblocks</name>
<value>4</value>
<description>The number of reservation blocks which are used to prevent
unstable region servers caused by an OOME.
</description>
</property>
<property>
<name>hbase.regionserver.globalMemcache.upperLimit</name>
<value>0.4</value>
<description>Maximum size of all memcaches in a region server before new
updates are blocked and flushes are forced. Defaults to 40% of heap.
</description>
</property>
<property>
<name>hbase.regionserver.globalMemcache.lowerLimit</name>
<value>0.25</value>
<description>When memcaches are being forced to flush to make room in
memory, keep flushing until we hit this mark. Defaults to 30% of heap.
This value equal to hbase.regionserver.globalmemcache.upperLimit causes
the minimum possible flushing to occur when updates are blocked due to
memcache limiting.
</description>
</property>
<property>
<name>hbase.hbasemaster.maxregionopen</name>
<value>120000</value>
<description>Period to wait for a region open. If regionserver
takes longer than this interval, assign to a new regionserver.
</description>
</property>
<property>
<name>hbase.server.thread.wakefrequency</name>
<value>10000</value>
<description>Time to sleep in between searches for work (in milliseconds).
Used as sleep interval by service threads such as META scanner and log roller.
</description>
</property>
<property>
<name>hbase.hregion.memcache.flush.size</name>
<value>67108864</value>
<description>
A HRegion memcache will be flushed to disk if size of the memcache
exceeds this number of bytes. Value is checked by a thread that runs
every hbase.server.thread.wakefrequency.
</description>
</property>
<property>
<name>hbase.hregion.memcache.block.multiplier</name>
<value>2</value>
<description>
Block updates if memcache has hbase.hregion.block.memcache
time hbase.hregion.flush.size bytes. Useful preventing
runaway memcache during spikes in update traffic. Without an
upper-bound, memcache fills such that when it flushes the
resultant flush files take a long time to compact or split, or
worse, we OOME.
</description>
</property>
<property>
<name>hbase.hregion.max.filesize</name>
<value>268435456</value>
<description>
Maximum HStoreFile size. If any one of a column families' HStoreFiles has
grown to exceed this value, the hosting HRegion is split in two.
Default: 256M.
</description>
</property>
<property>
<name>hbase.hstore.compactionThreshold</name>
<value>3</value>
<description>
If more than this number of HStoreFiles in any one HStore
(one HStoreFile is written per flush of memcache) then a compaction
is run to rewrite all HStoreFiles files as one. Larger numbers
put off compaction but when it runs, it takes longer to complete.
During a compaction, updates cannot be flushed to disk. Long
compactions require memory sufficient to carry the logging of
all updates across the duration of the compaction.
If too large, clients timeout during compaction.
</description>
</property>
<property>
<name>hbase.hstore.compaction.max</name>
<value>10</value>
<description>Max number of HStoreFiles to compact per 'minor' compaction.
</description>
</property>
<property>
<name>hbase.hregion.majorcompaction</name>
<value>86400000</value>
<description>The time (in miliseconds) between 'major' compactions of all
HStoreFiles in a region. Default: 1 day.
</description>
</property>
<property>
<name>hbase.regions.slop</name>
<value>0.1</value>
<description>Rebalance if regionserver has average + (average * slop) regions.
Default is 10% slop.
</description>
</property>
<property>
<name>hbase.io.index.interval</name>
<value>32</value>
<description>The interval at which we record offsets in hbase
store files/mapfiles. Default for stock mapfiles is 128. Index
files are read into memory. If there are many of them, could prove
a burden. If so play with the hadoop io.map.index.skip property and
skip every nth index member when reading back the index into memory.
</description>
</property>
<property>
<name>hbase.io.seqfile.compression.type</name>
<value>NONE</value>
<description>The compression type for hbase sequencefile.Writers
such as hlog.
</description>
</property>
<property>
<name>hbase.hstore.blockCache.blockSize</name>
<value>16384</value>
<description>The size of each block in the block cache.
Enable blockcaching on a per column family basis; see the BLOCKCACHE setting
in HColumnDescriptor. Blocks are kept in a java Soft Reference cache so are
let go when high pressure on memory. Block caching is enabled by default
as of hbase 0.19.0.
</description>
</property>
<property>
<name>hbase.hash.type</name>
<value>murmur</value>
<description>The hashing algorithm for use in HashFunction. Two values are
supported now: murmur (MurmurHash) and jenkins (JenkinsHash).
</description>
</property>
</configuration>