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https://issues.apache.org/jira/browse/HDFS-9819?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15151769#comment-15151769
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Lin Yiqun commented on HDFS-9819:
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Thanks [~vinayrpet]'s comments. HDFS-8845 make DiskChecker not check file
recursively can solve problems in my scenarios. But I want to know, should we
let volume can tolerate few times check-dir failed? Is there any other external
reason will lead check-dir failed?
> 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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