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https://issues.apache.org/jira/browse/HDFS-5922?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13911579#comment-13911579
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Hudson commented on HDFS-5922:
------------------------------
SUCCESS: Integrated in Hadoop-Hdfs-trunk #1684 (See
[https://builds.apache.org/job/Hadoop-Hdfs-trunk/1684/])
HDFS-5922. DN heartbeat thread can get stuck in tight loop. (Arpit Agarwal)
(arp: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1571542)
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSOutputStream.java
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BPServiceActor.java
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestIncrementalBlockReports.java
> 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
> Fix For: 3.0.0, 2.4.0
>
> 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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