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https://issues.apache.org/jira/browse/TAJO-2126?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15251146#comment-15251146
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ASF GitHub Bot commented on TAJO-2126:
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Github user jihoonson commented on the pull request:
https://github.com/apache/tajo/pull/1003#issuecomment-212704759
I did basic tests to verify query results, but there is one thing I'm
concerned with. That is the shuffle cost. This patch enables the parallel
execution of non-leaf EBs, thereby more shuffle operations can be executed
simultaneously. It can increase the shuffle cost especially for range shuffle
due to heavy index search.
So, we need to improve hash shuffle by reusing http connections and range
shuffle by redesigning the index structure.
However, I think the heavy shuffle costs should be addressed in other
Jiras. What do you think?
> Allow parallel execution of non-leaf sibling ExecutionBlocks
> ------------------------------------------------------------
>
> Key: TAJO-2126
> URL: https://issues.apache.org/jira/browse/TAJO-2126
> Project: Tajo
> Issue Type: Improvement
> Components: Scheduler
> Reporter: Jihoon Son
> Assignee: Jihoon Son
> Fix For: 0.12.0
>
>
> Execution of sibling ExecutionBlocks were blocked due to some reasons like
> too many concurrent disk access or some bugs of invalid query results. Since
> these problems are fixed, we need to allow it.
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