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Posted to dev@hive.apache.org by "Ashutosh Chauhan (JIRA)" <ji...@apache.org> on 2013/01/27 05:49:12 UTC

[jira] [Updated] (HIVE-3950) Remove code for merging files via MR job

     [ https://issues.apache.org/jira/browse/HIVE-3950?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ashutosh Chauhan updated HIVE-3950:
-----------------------------------

    Attachment: hive-3950.patch

Attaching patch. Phabricator link: https://reviews.facebook.net/D8211
                
> Remove code for merging files via MR job
> ----------------------------------------
>
>                 Key: HIVE-3950
>                 URL: https://issues.apache.org/jira/browse/HIVE-3950
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: Ashutosh Chauhan
>         Attachments: hive-3950.patch
>
>
> Hive can merge files either via MR job or via map only job. Obviously, doing it via map-only job is more efficient, but there is an option of doing it via MR job as well because CombineFileInputFormat is available only in hadoop-0.20 and later. Since, we no longer support hadoop versions earlier than 20 anymore all that is now dead code, we should get rid of it.

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