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https://issues.apache.org/jira/browse/HADOOP-5338?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Amar Kamat updated HADOOP-5338:
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Attachment: HADOOP-5338-v2.1.patch
Attaching a patch that removes the SYNC business and clears the tasktracker's
task-completion-events list upon restart. This will force the tasktracker to
pull back all the events. Result of test-patch
{code}
[exec] +1 overall.
[exec]
[exec] +1 @author. The patch does not contain any @author tags.
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[exec] +1 tests included. The patch appears to include 3 new or
modified tests.
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[exec] +1 javadoc. The javadoc tool did not generate any warning
messages.
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[exec] +1 javac. The applied patch does not increase the total number
of javac compiler warnings.
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[exec] +1 findbugs. The patch does not introduce any new Findbugs
warnings.
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[exec] +1 Eclipse classpath. The patch retains Eclipse classpath
integrity.
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[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, 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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