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https://issues.apache.org/jira/browse/HDFS-5405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13803750#comment-13803750
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Colin Patrick McCabe commented on HDFS-5405:
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I had to look at this one for a while, but I think you got it. We don't want
to lose that retry cache state. +1.
> Fix possible RetryCache hang for caching RPC handlers in FSNamesystem
> ---------------------------------------------------------------------
>
> Key: HDFS-5405
> URL: https://issues.apache.org/jira/browse/HDFS-5405
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Affects Versions: HDFS-4949
> Reporter: Andrew Wang
> Assignee: Andrew Wang
> Attachments: hdfs-5405-1.patch
>
>
> Related to the fix in HDFS-5299, we need to make sure that uncaught
> exceptions happen before {{RetryCache.waitForCompletion}}, or badly timed
> failovers can lead to a perma-hang.
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