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https://issues.apache.org/jira/browse/HADOOP-3140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12584430#action_12584430
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Amar Kamat commented on HADOOP-3140:
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bq. In addition, we should discard outputs of failed tasks in
TaskTracker.Child.main
Reiterating #4 from my earlier comment. Here we might ignore the failed/killed
tasks and never call discard. It will be taken care once the job completes.
This is a simple approach. Another approach is to have a scavenger thread that
will periodically do this cleanup business *offline*.
> 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
>
> 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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