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Posted to dev@hive.apache.org by "Sanjay Radia (JIRA)" <ji...@apache.org> on 2013/08/13 23:18:49 UTC

[jira] [Commented] (HIVE-2849) Use the MapReduce output committer

    [ https://issues.apache.org/jira/browse/HIVE-2849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13738846#comment-13738846 ] 

Sanjay Radia commented on HIVE-2849:
------------------------------------

Hive also writes output to /tmp and renames to final output dir; this makes use of hive under federation problematic since one often wants /tmp to be a separate volume and renames are currently not supported across hdfs volumes.  Using the output committer will mean that the temporary output is in the output dir's subtree and hence the rename works.
                
> Use the MapReduce output committer
> ----------------------------------
>
>                 Key: HIVE-2849
>                 URL: https://issues.apache.org/jira/browse/HIVE-2849
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Owen O'Malley
>            Assignee: Owen O'Malley
>
> Currently Hive implements its own output committers based on the size of the files using regexes to parse out the task ids. The MapReduce output committers are very stable and use a two phase commit from the JobTracker.

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