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https://issues.apache.org/jira/browse/HDFS-7496?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14316868#comment-14316868
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Chris Nauroth commented on HDFS-7496:
-------------------------------------

[~eddyxu], thanks for the response.  Let's handle it in a new jira, since this 
one has been closed for a while.  Please feel free to contact me on the new 
jira for code review.

> Fix FsVolume removal race conditions on the DataNode by reference-counting 
> the volume instances
> -----------------------------------------------------------------------------------------------
>
>                 Key: HDFS-7496
>                 URL: https://issues.apache.org/jira/browse/HDFS-7496
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Colin Patrick McCabe
>            Assignee: Lei (Eddy) Xu
>             Fix For: 2.7.0
>
>         Attachments: HDFS-7496-branch-2.000.patch, HDFS-7496.000.patch, 
> HDFS-7496.001.patch, HDFS-7496.002.patch, HDFS-7496.003.patch, 
> HDFS-7496.003.patch, HDFS-7496.004.patch, HDFS-7496.005.patch, 
> HDFS-7496.006.patch, HDFS-7496.007.patch
>
>
> We discussed a few FsVolume removal race conditions on the DataNode in 
> HDFS-7489.  We should figure out a way to make removing an FsVolume safe.



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