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https://issues.apache.org/jira/browse/HDFS-7496?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14318982#comment-14318982
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Colin Patrick McCabe commented on HDFS-7496:
--------------------------------------------
Good find, [~cnauroth]!
> 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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