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https://issues.apache.org/jira/browse/HDFS-9819?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15152427#comment-15152427
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Kihwal Lee commented on HDFS-9819:
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checkdir is essentially permission and ROFS check. As far as I can see, there
is no such thing as legitimate "transient" checkdir failures.
> FsVolume should tolerate few times check-dir failed due to deletion by mistake
> ------------------------------------------------------------------------------
>
> Key: HDFS-9819
> URL: https://issues.apache.org/jira/browse/HDFS-9819
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.7.1
> Reporter: Lin Yiqun
> Assignee: Lin Yiqun
> Attachments: HDFS-9819.001.patch
>
>
> FsVolume should tolerate few times check-dir failed because sometimes we will
> do a delete dir/file operation by mistake in datanode data-dirs. Then the
> {{DataNode#startCheckDiskErrorThread}} will invoking checkDir method
> periodicity and find dir not existed, throw exception. The checked volume
> will be added to failed volume list. The blocks on this volume will be
> replicated again. But actually, this is not needed to do. We should let
> volume can be tolerated few times check-dir failed like config
> {{dfs.datanode.failed.volumes.tolerated}}.
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