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