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From "Amareshwari Sriramadasu (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5338) Reduce tasks are stuck waiting for map outputs when none are in progress
Date Thu, 05 Mar 2009 03:46:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12679059#action_12679059
] 

Amareshwari Sriramadasu commented on HADOOP-5338:
-------------------------------------------------

+1
Patch looks fine.

> 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.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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