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From "Ramkumar Vadali (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-2214) TaskTracker should release slot if task is not launched
Date Sat, 11 Dec 2010 22:50:02 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2214?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12970534#action_12970534
] 

Ramkumar Vadali commented on MAPREDUCE-2214:
--------------------------------------------

TEST RESULTS

ant test-patch complains about unit-tests, but its difficult to come up with a unit-test for
this.
{code}
     [exec] -1 overall.
     [exec]
     [exec]     +1 @author.  The patch does not contain any @author tags.
     [exec]
     [exec]     -1 tests included.  The patch doesn't appear to include any new or modified
tests.
     [exec]                         Please justify why no new tests are needed for this patch.
     [exec]                         Also please list what manual steps were performed to verify
this patch.
     [exec]
     [exec]     +1 javadoc.  The javadoc tool did not generate any warning messages.
     [exec]
     [exec]     +1 javac.  The applied patch does not increase the total number of javac compiler
warnings.
     [exec]
     [exec]     +1 findbugs.  The patch does not introduce any new Findbugs (version 1.3.9)
warnings.
     [exec]
     [exec]     +1 release audit.  The applied patch does not increase the total number of
release audit warnings.
     [exec]
     [exec]     +1 system test framework.  The patch passed system test framework compile.
     [exec]
     [exec]
     [exec]
     [exec]
     [exec] ======================================================================
     [exec] ======================================================================
     [exec]     Finished build.
     [exec] ======================================================================
     [exec] ======================================================================
     [exec]
     [exec]
{code}

ant test: there was only one test failure, but that fails in a clean checkout too.
{code}
    [junit] Test org.apache.hadoop.mapred.TestControlledMapReduceJob FAILED (timeout)
{code}

> TaskTracker should release slot if task is not launched
> -------------------------------------------------------
>
>                 Key: MAPREDUCE-2214
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2214
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 0.20.1
>            Reporter: Ramkumar Vadali
>            Assignee: Ramkumar Vadali
>         Attachments: MAPREDUCE-2214.patch
>
>
> TaskTracker.TaskInProgress.launchTask() does not launch a task if it is not in an expected
state. However, in the case where the task is not launched, the slot is not released. We have
observed this in production - the task was in SUCCEEDED state by the time launchTask() got
to it and then the slot was never released. It is not clear how the task got into that state,
but it is better to handle the case.

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