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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1098) Incorrect synchronization in DistributedCache causes TaskTrackers to freeze up during localization of Cache for tasks.
Date Thu, 15 Oct 2009 14:22:31 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1098?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12766073#action_12766073
] 

Hadoop QA commented on MAPREDUCE-1098:
--------------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12422215/patch-1098-1.txt
  against trunk revision 825465.

    +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 does not introduce any new Findbugs 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 contrib tests.  The patch passed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h3.grid.sp2.yahoo.net/77/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h3.grid.sp2.yahoo.net/77/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h3.grid.sp2.yahoo.net/77/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h3.grid.sp2.yahoo.net/77/console

This message is automatically generated.

> Incorrect synchronization in DistributedCache causes TaskTrackers to freeze up during
localization of Cache for tasks.
> ----------------------------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-1098
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1098
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: tasktracker
>            Reporter: Sreekanth Ramakrishnan
>            Assignee: Amareshwari Sriramadasu
>             Fix For: 0.21.0
>
>         Attachments: patch-1098-1.txt, patch-1098.txt
>
>
> Currently {{org.apache.hadoop.filecache.DistributedCache.getLocalCache(URI, Configuration,
Path, FileStatus, boolean, long, Path, boolean)}} allows only one {{TaskRunner}} thread in
TT to localize {{DistributedCache}} across jobs. Current way of synchronization is across
baseDir this has to be changed to lock on the same baseDir.

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