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Posted to issues@tajo.apache.org by "Hyunsik Choi (JIRA)" <ji...@apache.org> on 2015/12/03 08:50:10 UTC

[jira] [Created] (TAJO-2007) By default, Optimizer should use the table volume in TableStat.

Hyunsik Choi created TAJO-2007:
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             Summary: By default, Optimizer should use the table volume in TableStat.
                 Key: TAJO-2007
                 URL: https://issues.apache.org/jira/browse/TAJO-2007
             Project: Tajo
          Issue Type: Improvement
          Components: Planner/Optimizer
            Reporter: Hyunsik Choi
            Assignee: Hyunsik Choi
             Fix For: 0.12.0, 0.11.1


Currently, the optimizer by default gets table volumes through storage manager and employ them for join optimization. But, in some cases, it causes performance degradation because aggregating all file volumes is not cheap in large partitioned tables on S3 or HDFS.

So, this patch improves TableStatUpdateRewriter to use table volumes of TableStat by default, and it also adds a session variable 'USE_TABLE_VOLUME' to allow the optimizer to use the table volume through storage handler.



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