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https://issues.apache.org/jira/browse/HDFS-2213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13076236#comment-13076236
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Todd Lipcon commented on HDFS-2213:
-----------------------------------
my question is what changed in trunk in the last couple of weeks that made this
start happening with high frequency. I had never seen it before about a month
ago, and now I see it most days.
> DataNode gets stuck while shutting down minicluster
> ---------------------------------------------------
>
> Key: HDFS-2213
> URL: https://issues.apache.org/jira/browse/HDFS-2213
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: data-node
> Affects Versions: 0.23.0
> Reporter: Todd Lipcon
> Fix For: 0.23.0
>
> Attachments: stack.txt
>
>
> I've seen a couple times where a unit test has timed out. jstacking shows the
> cluster is stuck trying to shut down one of the DataNode HTTP servers. The
> DataNodeBlockScanner thread also seems to be in a tight loop in its main loop.
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