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https://issues.apache.org/jira/browse/HDFS-14264?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16899386#comment-16899386
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Wei-Chiu Chuang commented on HDFS-14264:
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Use the DF implementation added in HADOOP-12974 should help as well.
I am aware certain users having this problem, but not all. I wonder what makes
the difference: disk configuration (many vs a few disks), local file system, or
operating system version?
> Datanode du -sk command is slow
> -------------------------------
>
> Key: HDFS-14264
> URL: https://issues.apache.org/jira/browse/HDFS-14264
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 2.7.1
> Reporter: Amithsha
> Priority: Major
>
> Datanode consuming more time on du -sk command as well as creating heavy IO
> on disk. In our prod systems, each disk of dfs usage is 3Tb, to caculate it,
> the datanode will spend 10-20min Avg time. Also nodemanagers are running on
> the same box during this du -sk operation could see heavy IO on disk.
> Datanode should cache the usage and also not to be cleared by any other
> process.
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