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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3139) DistributedFileSystem.close() introduces a deadlock
Date Tue, 01 Apr 2008 06:14:27 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3139?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12584025#action_12584025
] 

Hadoop QA commented on HADOOP-3139:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
http://issues.apache.org/jira/secure/attachment/12378978/3139_20080331.patch
against trunk revision 619744.

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

    tests included -1.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no tests are needed for this patch.

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

    javac +1.  The applied patch does not generate any new javac compiler warnings.

    release audit +1.  The applied patch does not generate any new release audit warnings.

    findbugs +1.  The patch does not introduce any new Findbugs warnings.

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

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

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2106/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2106/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2106/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2106/console

This message is automatically generated.

> DistributedFileSystem.close() introduces a deadlock
> ---------------------------------------------------
>
>                 Key: HADOOP-3139
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3139
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>            Priority: Blocker
>             Fix For: 0.17.0
>
>         Attachments: 3139_20080331.patch
>
>
> Koji found the following:
> My dfs -ls hang. 
> Ctrl-Z showed a deadlock state.
> {noformat}
> "Thread-0":
>         at org.apache.hadoop.dfs.DistributedFileSystem.close(DistributedFileSystem.java:190)
>         - waiting to lock <0xedde8788> (a org.apache.hadoop.dfs.DistributedFileSystem)
>         at org.apache.hadoop.fs.FileSystem$Cache.closeAll(FileSystem.java:1231)
>         - locked <0xee0baf88> (a org.apache.hadoop.fs.FileSystem$Cache)
>         at org.apache.hadoop.fs.FileSystem.closeAll(FileSystem.java:169)
>         at org.apache.hadoop.fs.FileSystem$ClientFinalizer.run(FileSystem.java:154)
>         - locked <0xee0bae40> (a org.apache.hadoop.fs.FileSystem$ClientFinalizer)
> "main":
>         at org.apache.hadoop.fs.FileSystem$Cache.remove(FileSystem.java:1201)
>         - waiting to lock <0xee0baf88> (a org.apache.hadoop.fs.FileSystem$Cache)
>         at org.apache.hadoop.fs.FileSystem.close(FileSystem.java:1085)
>         at org.apache.hadoop.dfs.DistributedFileSystem.close(DistributedFileSystem.java:192)
>         - locked <0xedde8788> (a org.apache.hadoop.dfs.DistributedFileSystem)
>         at org.apache.hadoop.fs.FsShell.close(FsShell.java:1698)
>         at org.apache.hadoop.fs.FsShell.main(FsShell.java:1712)
> Found 1 deadlock.
> {noformat}

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