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From "Zheng Shao (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-629) concat files needed for map-reduce jobs also
Date Wed, 15 Jul 2009 23:41:14 GMT

    [ https://issues.apache.org/jira/browse/HIVE-629?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12731745#action_12731745
] 

Zheng Shao commented on HIVE-629:
---------------------------------

That makes sense.

If the user is doing a map-reduce job, we'd better not add such a task because the partitioning
will be completely changed.

In the future, we can do further optimizations to enable it for map-reduce job, only if the
partition key and sort key is still available at the FileSink.

Will test and commit.


> concat files needed for map-reduce jobs also
> --------------------------------------------
>
>                 Key: HIVE-629
>                 URL: https://issues.apache.org/jira/browse/HIVE-629
>             Project: Hadoop Hive
>          Issue Type: Improvement
>          Components: Query Processor
>    Affects Versions: 0.4.0
>            Reporter: Namit Jain
>            Assignee: Namit Jain
>         Attachments: hive.629.1.patch, hive.629.2.patch
>
>
> Currently, hive concatenates files only if the job under consideration is a map-only
job. 
> I got some requests from some users, where they want this behavior for map-reduce jobs
also - it may not be a good idea to turn it on by default.
> But, we should provide an option to the user where the concatenation can happen even
for map-reduce jobs.

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