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https://issues.apache.org/jira/browse/HDFS-12855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16286621#comment-16286621
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Daryn Sharp commented on HDFS-12855:
------------------------------------

That's completely broken.  This code path isn't for a full fsck, it's for a 
specific block which isn't a common operation unless debugging.  We haven't hit 
it, no patch, sorry.

> 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
>            Assignee: Manoj Govindassamy
>
> {{NamenodeFsck}} access {{FSNamesystem}} structures, such as INodes, 
> BlockInfo without holding a lock. See e.g. {{NamenodeFsck.blockIdCK()}}.



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