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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5368) Namenode deadlock during safemode extention
Date Wed, 16 Oct 2013 12:17:50 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13796710#comment-13796710

Hadoop QA commented on HDFS-5368:

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  against trunk revision .

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

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

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

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any 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/5209//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/5209//console

This message is automatically generated.

> Namenode deadlock during safemode extention
> -------------------------------------------
>                 Key: HDFS-5368
>                 URL: https://issues.apache.org/jira/browse/HDFS-5368
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 3.0.0, 2.2.0
>            Reporter: Vinay
>            Assignee: Vinay
>            Priority: Blocker
>         Attachments: HDFS-5368.patch, NN-deadlock.zip
> Namenode entered to safemode during restart
> 1. After restart NN entered to safemode extention.
> 2. During this time deadlock happened between datanode heartbeat and SafemodeMonitor()
> Found one Java-level deadlock:
> =============================
> "org.apache.hadoop.hdfs.server.namenode.FSNamesystem$SafeModeMonitor@9fe953":
>   waiting to lock monitor 0x18c3b42c (object 0x0439c6f8, a java.util.TreeMap),
>   which is held by "IPC Server handler 2 on 62212"
> "IPC Server handler 2 on 62212":
>   waiting to lock monitor 0x18c3987c (object 0x043849a0, a org.apache.hadoop.hdfs.server.namenode.FSNamesystem$SafeModeInfo),
>   which is held by "org.apache.hadoop.hdfs.server.namenode.FSNamesystem$SafeModeMonitor@9fe953"
> Check attached jstack for complete stack

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