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https://issues.apache.org/jira/browse/HDFS-4992?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13711057#comment-13711057
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Hudson commented on HDFS-4992:
------------------------------
FAILURE: Integrated in Hadoop-Hdfs-trunk #1463 (See
[https://builds.apache.org/job/Hadoop-Hdfs-trunk/1463/])
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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