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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4992) Make balancer's thread count configurable
Date Wed, 17 Jul 2013 10:54:49 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4992?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13710950#comment-13710950
] 

Hudson commented on HDFS-4992:
------------------------------

SUCCESS: Integrated in Hadoop-Yarn-trunk #273 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk/273/])
HDFS-4992. Make balancer's mover thread count and dispatcher thread count configurable.  Contributed
by Max Lapan (szetszwo: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1503720)
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/balancer/Balancer.java

                
> Make balancer's thread count configurable
> -----------------------------------------
>
>                 Key: HDFS-4992
>                 URL: https://issues.apache.org/jira/browse/HDFS-4992
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: balancer
>            Reporter: Max Lapan
>            Assignee: Max Lapan
>             Fix For: 2.1.0-beta
>
>         Attachments: HDFS-4992-v1.patch, HDFS-4992-v2.patch
>
>
> By default, balancer has 1000 threads which moves blocks around (mover threads) and 200
threads which decide which block to move (dispatcher threads).
> On large clusters, 1000 threads creates significant load on NN, which slows down other
HDFS activity. For example, on our cluster, 'hdfs dfs -ls /' command took about 1 minute when
balancer is active. When no balancing in progress, the same command finishes in second or
two.
> This patch makes amount of threads configurable by two new options 'dfs.balancer.moverThreads'
and 'dfs.balancer.dispatcherThreads'.

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