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From "Namit Jain (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-2046) A CombineFileInputSplit cannot be less than a dfs block
Date Wed, 01 Sep 2010 18:06:00 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2046?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12905122#action_12905122

Namit Jain commented on MAPREDUCE-2046:

Dhruba, I have also seen the same problem with HiveInputFormat, which I think (not sure) does
not go through CombineFileInputsplit.
Are we missing something else ?

> A CombineFileInputSplit cannot be less than a dfs block 
> --------------------------------------------------------
>                 Key: MAPREDUCE-2046
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2046
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>            Reporter: Namit Jain
>            Assignee: dhruba borthakur
> I ran into this while testing some hive features.
> Whether we use hiveinputformat or combinehiveinputformat, a split cannot be less than
a dfs block size.
> This is a problem if we want to increase the block size for older data to reduce memory
consumption for the
> name node.
> It would be useful if the input split was independent of the dfs block size.

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