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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5922) DN heartbeat thread can get stuck in tight loop
Date Sun, 23 Feb 2014 18:59:21 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5922?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13909846#comment-13909846
] 

Hadoop QA commented on HDFS-5922:
---------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12630573/HDFS-5922.02.patch
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 1 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-hdfs-project/hadoop-hdfs.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/6216//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/6216//console

This message is automatically generated.

> 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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