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https://issues.apache.org/jira/browse/HIVE-74?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12674769#action_12674769
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Joydeep Sen Sarma commented on HIVE-74:
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where are the pools for the combinefileinputformat created (one per table)?
> 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
> Components: Query Processor
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
> Fix For: 0.2.0
>
> Attachments: hiveCombineSplit.patch, 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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