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https://issues.apache.org/jira/browse/HADOOP-3140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12583888#action_12583888
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Arun C Murthy commented on HADOOP-3140:
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I agree, in principle.
However, there is currently no way to check if the maps wrote side-files to
HDFS, in which case we either need a new api for tasks (or jobs) to tell
whether they are writing side-files and hence they need promotion or worse, we
need to look into the _${taskid} directories and try and guess. Both seem
unsatisfactory ...
> JobTracker should not try to promote a (map) task if it dis 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
>
> 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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