[
https://issues.apache.org/jira/browse/HIVE-74?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12701036#action_12701036
]
dhruba borthakur edited comment on HIVE-74 at 4/20/09 8:43 PM:
---------------------------------------------------------------
This combines multiple blocks from files into a single split. All files of the
same table are part of a single pool.
was (Author: dhruba):
This combines multiple blocks from files into a single split.
> 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: 0.4.0
>
> Attachments: hiveCombineSplit.patch, hiveCombineSplit.patch,
> hiveCombineSplit2.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
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
