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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5473) Race condition in command-line kill for a task
Date Fri, 27 Mar 2009 12:10:50 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12689883#action_12689883

Hadoop QA commented on HADOOP-5473:

-1 overall.  Here are the results of testing the latest attachment 
  against trunk revision 759030.

    +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 tests are needed for 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 Eclipse classpath. The patch retains Eclipse classpath integrity.

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

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

    -1 contrib tests.  The patch failed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-vesta.apache.org/148/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-vesta.apache.org/148/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-vesta.apache.org/148/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-vesta.apache.org/148/console

This message is automatically generated.

> Race condition in command-line kill for a task
> ----------------------------------------------
>                 Key: HADOOP-5473
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5473
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>            Reporter: Amareshwari Sriramadasu
>            Assignee: Amareshwari Sriramadasu
>             Fix For: 0.19.2
>         Attachments: patch-5473-1.txt, patch-5473-2.txt
> The race condition occurs in following sequence of events:
> 1. User issues a command-line kill for a RUNNING map-task. JT stores the task in tasksToKill
> 2. TT reports the task status as SUCCEEDED.
> 3. JT creates a TaskCompletionEvent as SUCCEEDED. Also sends a killTaskAction.
> 4. Reducers fail fetching the map output.
> 5. finally, the task would fail with Fetch failures. After HADOOP-4759, the task is left
as FAILED_UNCLEAN task, since the task is present in tasksToKill mapping.

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