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https://issues.apache.org/jira/browse/HIVE-74?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Raghotham Murthy updated HIVE-74:
---------------------------------
Resolution: Fixed
Fix Version/s: (was: 0.4.0)
0.5.0
Release Note:
HIVE-74. Hive can use CombineFileInputFormat for when the input has many
small files (Namit Jain via rmurthy)
Hadoop Flags: [Reviewed]
Status: Resolved (was: Patch Available)
Committed. Thanks Namit.
> 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: Namit Jain
> Fix For: 0.5.0
>
> Attachments: hive.74.1.patch, hive.74.2.patch,
> 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
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