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https://issues.apache.org/jira/browse/HDFS-5922?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13910853#comment-13910853
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Arpit Agarwal commented on HDFS-5922:
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The {{TestCacheDirectives}} failure is unrelated to the patch.
> DN heartbeat thread can get stuck in tight loop
> -----------------------------------------------
>
> Key: HDFS-5922
> URL: https://issues.apache.org/jira/browse/HDFS-5922
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Affects Versions: 2.3.0
> Reporter: Aaron T. Myers
> Assignee: Arpit Agarwal
> Attachments: HDFS-5922.01.patch, HDFS-5922.02.patch
>
>
> We saw an issue recently on a test cluster where one of the DN threads was
> consuming 100% of a single CPU. Running jstack indicated that it was the DN
> heartbeat thread. I believe I've tracked down the cause to a bug in the
> accounting around the value of {{pendingReceivedRequests}}.
> More details in the first comment.
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