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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HIVE-74) Hive can use CombineFileInputFormat for when the input are many small files
Date Thu, 20 Nov 2008 09:46:44 GMT

     [ https://issues.apache.org/jira/browse/HIVE-74?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

dhruba borthakur updated HIVE-74:
---------------------------------

    Attachment: hiveCombineSplit.patch

This code is for review purposes only. I would rather create a new classes called HiveCombineInputFormat
HiveCombineRecordReader and put in all this new code into there without changing existing
classes.

> Hive can use CombineFileInputFormat for when the input are many small files
> ---------------------------------------------------------------------------
>
>                 Key: HIVE-74
>                 URL: https://issues.apache.org/jira/browse/HIVE-74
>             Project: Hadoop Hive
>          Issue Type: Improvement
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>             Fix For: 0.20.0
>
>         Attachments: hiveCombineSplit.patch
>
>
> There are cases when the input to a Hive job are thousands of small files. In this case,
there is a mapper for each file. Most of the overhead for spawning all these mappers can be
avoided if Hive used CombineFileInputFormat introduced via HADOOP-4565

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