配置Hadoop M/R 采用Fair Scheduler算法代替FIFO

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最新推荐文章于 2018-12-25 16:00:41 发布

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http://www.blogjava.net/paulwong/archive/2013/01/31/394997.html

采用Cloudera版本的hadoop/hbase:

hadoop-0.20.2-cdh3u0

hbase-0.90.1-cdh3u0

zookeeper-3.3.3-cdh3u0

默认已支持FairScheduler调度算法.

只需改配置使期用FairSchedule而非默认的JobQueueTaskScheduler即可.

配置fair-scheduler.xml (/$HADOOP_HOME/conf/):

<? xml version="1.0" ?>
< property >
     < name >mapred.fairscheduler.allocation.file </ name >
     < value >[HADOOP_HOME]/conf/fair-scheduler.xml </ value >
</ property >
< allocations >
     < pool name ="qiji-task-pool" >
         < minMaps >5 </ minMaps >
         < minReduces >5 </ minReduces >
         < maxRunningJobs >
             < maxRunningJobs >5 </ maxRunningJobs >
             < minSharePreemptionTimeout >300 </ minSharePreemptionTimeout >
             < weight >1.0 </ weight >
     </ pool >
     < user name ="ecap" >
         < maxRunningJobs >
             < maxRunningJobs >6 </ maxRunningJobs >
     </ user >
     < poolMaxJobsDefault >10 </ poolMaxJobsDefault >
     < userMaxJobsDefault >8 </ userMaxJobsDefault >
     < defaultMinSharePreemptionTimeout >600
     </ defaultMinSharePreemptionTimeout >
     < fairSharePreemptionTimeout >600 </ fairSharePreemptionTimeout >
</ allocations >

配置$HADOOP_HOME/conf/mapred-site.xml,最后添加:

< property >
     < name >mapred.jobtracker.taskScheduler </ name >
     < value >org.apache.hadoop.mapred.FairScheduler </ value >
</ property >
< property >
     < name >mapred.fairscheduler.allocation.file </ name >
     < value >/opt/hadoop/conf/fair-scheduler.xml </ value >
</ property >
< property >
     < name >mapred.fairscheduler.assignmultiple </ name >
     < value >true </ value >
</ property >
< property >
     < name >mapred.fairscheduler.sizebasedweight </ name >
     < value >true </ value >
</ property >

然后重新运行集群,这样有几个Job(上面配置是5个并行)并行运行时,不会因为一个Job把Map/Reduce占满而使其它Job处于Pending状态.

可从: http://<masterip>:50030/scheduler查看并行运行的状态.

posted on 2013-01-31 17:30 paulwong 阅读(990) 评论(1) 编辑收藏所属分类: HADOOP 、云计算

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# re: 配置Hadoop M/R 采用Fair Scheduler算法代替FIFO2013-05-17 10:07Christopher

楼主你好，最近我也在配置hadoop的fair scheduler, 但是遇到了一些问题。
首先我使用的是cloudera-cdh-demo-vm-4.2.0-kvm。当我配置$HADOOP_HOME/conf/mapred-site.xml时，指定pool的分配文件，
<property>
<name>mapred.fairscheduler.allocation.file</name>
<value>/usr/lib/hadoop-0.20-mapreduce/conf/fair-scheduler.xml</value>
</property>
重启cluster之后，无法登录http://<masterip>:50030/scheduler查看并行运行的状态.