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From "Amar Kamat (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-5338) Reduce tasks are stuck waiting for map outputs when none are in progress
Date Fri, 06 Mar 2009 04:25:56 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-5338?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Amar Kamat updated HADOOP-5338:
-------------------------------

    Attachment: HADOOP-5338-v2.3.patch
                HADOOP-5338-v2.2-branch-20.patch

Attaching a patch that fixes the test-case issue in 20. Result of test-patch
{code}
[exec] +1 overall.  
     [exec] 
     [exec]     +1 @author.  The patch does not contain any @author tags.
     [exec] 
     [exec]     +1 tests included.  The patch appears to include 3 new or modified tests.
     [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 warnings.
     [exec] 
     [exec]     +1 Eclipse classpath. The patch retains Eclipse classpath integrity.
     [exec] 
     [exec]     +1 release audit.  The applied patch does not increase the total number of
release audit warnings.
{code}

> Reduce tasks are stuck waiting for map outputs when none are in progress
> ------------------------------------------------------------------------
>
>                 Key: HADOOP-5338
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5338
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.20.0
>            Reporter: Ramya R
>            Assignee: Amar Kamat
>            Priority: Blocker
>             Fix For: 0.20.0
>
>         Attachments: HADOOP-5338-v2.1.patch, HADOOP-5338-v2.2-branch-20.patch, HADOOP-5338-v2.2-branch-20.patch,
HADOOP-5338-v2.2.patch, HADOOP-5338-v2.3.patch, log.txt
>
>
> When JT is restarted several times, a situation is encountered when the reduce tasks
are stuck forever waiting for map outputs. However 100%map is complete and none of the map
tasks are in progress. The reduce tasks wait infinitely.

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