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https://issues.apache.org/jira/browse/HIVE-7052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13995994#comment-13995994
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Rajesh Balamohan commented on HIVE-7052:
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https://reviews.apache.org/r/21357/diff/#index_header
> Optimize split calculation time
> -------------------------------
>
> Key: HIVE-7052
> URL: https://issues.apache.org/jira/browse/HIVE-7052
> Project: Hive
> Issue Type: Bug
> Environment: hive + tez
> Reporter: Rajesh Balamohan
> Assignee: Rajesh Balamohan
> Labels: performance
> Attachments: HIVE-7052-profiler-1.png, HIVE-7052-profiler-2.png
>
>
> When running a TPC-DS query (query_27), significant amount of time was spent
> in split computation on a dataset of size 200 GB (ORC format).
> Profiling revealed that,
> 1. Lot of time was spent in Config's subtitutevar (regex) in
> HiveInputFormat.getSplits() method.
> 2. FileSystem was created repeatedly in OrcInputFormat.generateSplitsInfo().
> I will attach the profiler snapshots soon.
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