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Posted to dev@hive.apache.org by "Rajesh Balamohan (JIRA)" <ji...@apache.org> on 2014/05/13 05:05:14 UTC
[jira] [Updated] (HIVE-7052) Optimize split calculation time
[ https://issues.apache.org/jira/browse/HIVE-7052?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Rajesh Balamohan updated HIVE-7052:
-----------------------------------
Attachment: HIVE-7052-profiler-2.png
HIVE-7052-profiler-1.png
> 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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