[jira] Commented: (HADOOP-3140) JobTracker should not try to promote a (map) task if it dis not write to DFS at all

["Arun C Murthy (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-3140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12583888#action_12583888 ] 

Arun C Murthy commented on HADOOP-3140:
---------------------------------------

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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