hadoop 2.2.X 配置参数说明：mapred-site.xml

  <configuration>
    <property>
    <name>mapreduce.task.timeoutname>
    <value>600000value>
  property>
    <property>
    <name>mapreduce.cluster.local.dirname>
    <value>/hadoop/mapredvalue>

  property>
    <property>
    <name>mapreduce.reduce.input.buffer.percentname>
    <value>0.0value>

  property>
    <property>
    <name>mapreduce.jobhistory.addressname>
    <value>hadoop01:10020value>

  property>
    <property>
    <name>mapreduce.cluster.reducememory.mbname>
    <value>2048value>

  property>
  <property>
    <name>mapred.cluster.max.reduce.memory.mbname>
    <value>4096value>

  property>
  <property>
    <name>mapred.cluster.max.map.memory.mbname>
    <value>6144value>

  property>
  <property>
    <name>mapred.cluster.map.memory.mbname>
    <value>1536value>

  property>
  <property>
    <name>mapreduce.map.memory.mbname>
    <value>1536value>
   
  property>
  <property>
    <name>mapreduce.reduce.memory.mbname>
    <value>2048value>

  property>
    <property>
    <name>mapred.child.java.optsname>
    <value>-Xmx1024mvalue>

  property>
    <property>
    <name>mapreduce.tasktracker.healthchecker.script.pathname>
    <value>file:mapred/jobstatusvalue>
  property>
    <property>
    <name>yarn.app.mapreduce.am.staging-dirname>
    <value>/uservalue>
  property>
    <property>
    <name>mapred.task.tracker.task-controllername>
    <value>org.apache.hadoop.mapred.DefaultTaskControllervalue>

  property>
    <property>
    <name>mapreduce.jobhistory.intermediate-done-dirname>
    <value>/mr-history/tmpvalue>
  property>
    <property>
    <name>mapreduce.map.sort.spill.percentname>
    <value>0.1value>

  property>
    <property>
    <name>mapreduce.jobhistory.done-dirname>
    <value>/mr-history/donevalue>
  property>
    <property>
    <name>mapreduce.jobhistory.webapp.addressname>
    <value>hadoop01:19888value>

  property>
    <property>
    <name>mapreduce.map.speculativename>
    <value>falsevalue>

  property>
    <property>
    <name>mapreduce.output.fileoutputformat.compress.typename>
    <value>BLOCKvalue>

  property>
  <property>
    <name>mapreduce.map.output.compressname>
    <value>FALSEvalue>

  property>
    <property>
    <name>mapreduce.output.fileoutputformat.compress.codecname>
    <value>org.apache.hadoop.io.compress.DefaultCodecvalue>


  property>
    <property>
    <name>mapreduce.task.io.sort.mbname>
    <value>200value> 

  property>
    <property>
    <name>mapreduce.reduce.merge.inmem.thresholdname>
    <value>1000value>

  property>
    <property>
    <name>mapreduce.shuffle.portname>
    <value>8081value>
  property>
    <property>
    <name>mapred.jobtracker.taskSchedulername>
    <value>org.apache.hadoop.mapred.CapacityTaskSchedulervalue>

  property>
    <property>
    <name>mapreduce.task.io.sort.factorname>
    <value>100value>

  property>
    <property>
    <name>mapreduce.jobtracker.system.dirname>
    <value>/mapred/systemvalue>
  property>
    <property>
    <name>mapreduce.jobtracker.tasktracker.maxblacklistsname>
    <value>16value>

  property>
    <property>
    <name>mapreduce.reduce.shuffle.input.buffer.percentname>
    <value>0.7value>

  property>
  <property>
    <name>mapreduce.job.mapsname>
    <value>6value>

  property>
  <property>
    <name>mapreduce.job.reducesname>
    <value>3value>

  property>
    <property>
    <name>mapreduce.reduce.shuffle.merge.percentname>
    <value>0.66value>

  property>
    <property>
    <name>mapred.jobtracker.maxtasks.per.jobname>
    <value>-1value>

  property>
    <property>
    <name>mapreduce.job.reduce.slowstart.completedmapsname>
    <value>0.05value>

  property>
    <property>
    <name>mapreduce.tasktracker.healthchecker.script.timeoutname>
    <value>60000value>

  property>
    <property>
    <name>mapreduce.reduce.input.limitname>
    <value>10737418240value>

  property>
    <property>
    <name>mapreduce.reduce.shuffle.parallelcopiesname>
    <value>30value>

  property>
  <property>
    <name>mapreduce.tasktracker.reduce.tasks.maximumname>
    <value>4value>

  property>
  <property>
    <name>mapreduce.tasktracker.map.tasks.maximumname>
    <value>4value>

  property>
    <property>
    <name>mapreduce.reduce.speculativename>
    <value>falsevalue>

  property>
    <property>
    <name>mapreduce.framework.namename>
    <value>yarnvalue>

  property>
    <property>
    <name>mapred.userlog.retain.hoursname>
    <value>24value>

  property>
  <property>
<name>mapreduce.admin.map.child.java.optsname>
<value>-server -XX:NewRatio=8 -Djava.library.path=/usr/lib/hadoop/lib/native/ -Djava.net.preferIPv4Stack=truevalue>
<final>truefinal>

property>
  <property>
<name>mapreduce.admin.reduce.child.java.optsname>
<value>-server -XX:NewRatio=8 -Djava.library.path=/usr/lib/hadoop/lib/native/ -Djava.net.preferIPv4Stack=truevalue>
<final>truefinal>

  property>
  <property>
<name>io.compression.codecsname>    
<value>org.apache.hadoop.io.compress.GzipCodec,org.apache.hadoop.io.compress.DefaultCodec,org.apache.hadoop.io.compress.SnappyCodecvalue>

  property>
  configuration>

Original: https://blog.51cto.com/michaelkang/5580809
Author: 无锋剑客
Title: hadoop 2.2.X 配置参数说明：mapred-site.xml