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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3646) LeaseRenewer can hold reference to inactive DFSClient instances forever
Date Tue, 17 Jul 2012 18:23:35 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3646?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13416425#comment-13416425
] 

Hadoop QA commented on HDFS-3646:
---------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12536842/hdfs-3646.patch.txt
  against trunk revision .

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

    +1 tests included.  The patch appears to include 7 new or modified test files.

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

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

    +1 eclipse:eclipse.  The patch built with eclipse:eclipse.

    +1 findbugs.  The patch does not introduce any 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 unit tests in hadoop-hdfs-project/hadoop-hdfs.

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

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/2844//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/2844//console

This message is automatically generated.
                
> LeaseRenewer can hold reference to inactive DFSClient instances forever
> -----------------------------------------------------------------------
>
>                 Key: HDFS-3646
>                 URL: https://issues.apache.org/jira/browse/HDFS-3646
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs client
>    Affects Versions: 0.23.3, 2.0.0-alpha
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>            Priority: Critical
>             Fix For: 0.23.3, 2.1.0-alpha, 3.0.0
>
>         Attachments: hdfs-3646.patch, hdfs-3646.patch.txt, hdfs-3646.patch.txt
>
>
> If {{LeaseRenewer#closeClient()}} is not called, {{LeaseRenewer}} keeps the reference
to a {{DFSClient}} instance in {{dfsclients}} forever. This prevents {{DFSClient}}, {{LeaseRenewer}},
conf, etc. from being garbage collected, leading to memory leak.
> {{LeaseRenewer}} should remove the reference after some delay, if a {{DFSClient}} instance
no longer has active streams.

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