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https://issues.apache.org/jira/browse/HDFS-2213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13076143#comment-13076143
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Steve Loughran commented on HDFS-2213:
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I'll add that this problem may well exist in production DataNodes too, as it is
its shutdown code that is blocking. It's just surfacing in the minicluster as
this terminates more datanodes in a test run
> 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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