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https://issues.apache.org/jira/browse/HIVE-1357?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ning Zhang updated HIVE-1357:
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Status: Patch Available (was: Open)
> CombineHiveInputSplit should initialize the inputFileFormat once for a single
> split
> -----------------------------------------------------------------------------------
>
> Key: HIVE-1357
> URL: https://issues.apache.org/jira/browse/HIVE-1357
> Project: Hadoop Hive
> Issue Type: Improvement
> Reporter: Ning Zhang
> Assignee: Ning Zhang
> Attachments: HIVE-1357.patch
>
>
> If a split consists of multiple files, the FileFormat should always be the
> same, whether RCFile or SequenceFile. Currently the CombineHiveInputSplit
> tries to get the inputFileFormat for each new file in the split, which is
> O(n) where n is the number of files in the split. This is an O(n^2) operation
> and degrade the performance badly for combining large number of small files.
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