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Date: Thu, 2 Jun 2011 14:54:47 +0000 (UTC)
From: "Hadoop QA (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HADOOP-7191)  BackUpNameNode is using 100% CPU
 and not accepting any requests.
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    [ https://issues.apache.org/jira/browse/HADOOP-7191?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13042804#comment-13042804 ] 

Hadoop QA commented on HADOOP-7191:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12481236/HADOOP-7191.patch
  against trunk revision 1129989.

    +1 @author.  The patch does not contain any @author tags.

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    -1 findbugs.  The patch appears to introduce 2 new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit warnings.

    +1 core tests.  The patch passed core unit tests.

    +1 system test framework.  The patch passed system test framework compile.

Test results: https://builds.apache.org/hudson/job/PreCommit-HADOOP-Build/560//testReport/
Findbugs warnings: https://builds.apache.org/hudson/job/PreCommit-HADOOP-Build/560//artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: https://builds.apache.org/hudson/job/PreCommit-HADOOP-Build/560//console

This message is automatically generated.

>  BackUpNameNode is using 100% CPU and not accepting any requests.
> -----------------------------------------------------------------
>
>                 Key: HADOOP-7191
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7191
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: ipc
>    Affects Versions: 0.20-append, 0.23.0
>            Reporter: Uma Maheswara Rao G
>         Attachments: HADOOP-7191.patch
>
>
> In our environment, after 3 days long run Backup NameNode is using 100% CPU and not accepting any calls. 
> *Thread dump*
> "IPC Server Responder" daemon prio=10 tid=0x00007f86c41c6800 nid=0x3b2a runnable [0x00007f86ce579000]
> java.lang.Thread.State: RUNNABLE
> at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
> at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:215)
> at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
> at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
> locked <0x00007f86d67e2a20> (a sun.nio.ch.Util$1) 
> locked <0x00007f86d67e2a08> (a java.util.Collections$UnmodifiableSet) 
> locked <0x00007f86d67e26a8> (a sun.nio.ch.EPollSelectorImpl)
> at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
> at org.apache.hadoop.ipc.Server$Responder.run(Server.java:501) 
> Looks like we are running into similar issue like this Jetty one. http://jira.codehaus.org/browse/JETTY-937

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