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https://issues.apache.org/jira/browse/HDFS-12855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16277323#comment-16277323
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Konstantin Shvachko commented on HDFS-12855:
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Yes I believe it affects all versions. Delete is clearly one case. But any
change in file path (move or rename) will cause problems as well. See
HDFS-12832 as an example.
> Fsck violates namesystem locking
> ---------------------------------
>
> Key: HDFS-12855
> URL: https://issues.apache.org/jira/browse/HDFS-12855
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.7.4
> Reporter: Konstantin Shvachko
>
> {{NamenodeFsck}} access {{FSNamesystem}} structures, such as INodes,
> BlockInfo without holding a lock. See e.g. {{NamenodeFsck.blockIdCK()}}.
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