[
https://issues.apache.org/jira/browse/HADOOP-3140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12585199#action_12585199
]
dhruba borthakur commented on HADOOP-3140:
------------------------------------------
Like Amar mentioned, it would be nice if we can eliminate the call to
fs.exists() in the previous code snippet, especially if this code snippet is
executed frequently. fs.getContentSummary() probably throws an exception if the
file does not exists.
> 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
>
>
> 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.
>
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
