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https://issues.apache.org/jira/browse/TAJO-1383?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14355551#comment-14355551
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ASF GitHub Bot commented on TAJO-1383:
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Github user hyunsik commented on the pull request:
https://github.com/apache/tajo/pull/404#issuecomment-78131199
It causes severe memory consumption problem and performance degradation if
queries involve broadcast, especially in high-end servers which allow many task
concurrency. I'll review it today night.
> Improve broadcast table cache
> -----------------------------
>
> Key: TAJO-1383
> URL: https://issues.apache.org/jira/browse/TAJO-1383
> Project: Tajo
> Issue Type: Improvement
> Components: physical operator
> Affects Versions: 0.8.0, 0.9.0, 0.10
> Reporter: Jinho Kim
> Assignee: Jinho Kim
> Labels: performance
> Attachments: TAJO-1383.patch
>
>
> Currently, broadcast implementation keep a tuples on scan operator and It
> create a duplicated table cache in memory.
> We should improve it
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