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https://issues.apache.org/jira/browse/HADOOP-3140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12585966#action_12585966
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Hudson commented on HADOOP-3140:
--------------------------------
Integrated in Hadoop-trunk #451 (See
[http://hudson.zones.apache.org/hudson/job/Hadoop-trunk/451/])
> JobTracker should not try to promote a (map) task if it does not write to DFS
> at all
> ------------------------------------------------------------------------------------
>
> Key: HADOOP-3140
> URL: https://issues.apache.org/jira/browse/HADOOP-3140
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Reporter: Runping Qi
> Assignee: Amar Kamat
> Fix For: 0.17.0
>
> Attachments: HADOOP-3140-v1.patch, HADOOP-3140-v2.patch,
> HADOOP-3140-v3.patch, HADOOP-3140-v3.patch
>
>
> In most cases, map tasks do not write to dfs.
> Thus, when they complete, they should not be put into commit_pending queue at
> all.
> This will improve the task promotion significantly.
>
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