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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (MAPREDUCE-2046) A input split cannot be less than a dfs block
Date Tue, 31 Aug 2010 20:22:55 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2046?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Owen O'Malley resolved MAPREDUCE-2046.
--------------------------------------

    Resolution: Cannot Reproduce

This isn't true. InputSplits can be arbitrarily sized by the InputFormat. mapred.TextInputFormat
if you set the number of maps very high, you will generate a large number of maps. In the
new mapreduce.in.TextInputFormat, there are knobs that set the minimum and maximum block size.

> A input split 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
>
> 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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