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https://issues.apache.org/jira/browse/HDFS-6900?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14109902#comment-14109902
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Colin Patrick McCabe commented on HDFS-6900:
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What should we replace the threads with?
> Eliminate DU thread per block pool slice
> ----------------------------------------
>
> Key: HDFS-6900
> URL: https://issues.apache.org/jira/browse/HDFS-6900
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Affects Versions: 2.5.0
> Reporter: Arpit Agarwal
>
> We use one DU thread per block pool slice to compute disk usage information.
> In addition to the thread overhead this results in the disk usage information
> being out of date for up to 10 minutes at a time. We can refresh it more
> frequently but then we'd be launching a shell command per block pool slice
> even more often.
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