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https://issues.apache.org/jira/browse/HDFS-4992?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Max Lapan updated HDFS-4992:
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Status: Patch Available (was: Open)
Patch against trunk
> 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
>
> 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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