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https://issues.apache.org/jira/browse/IMPALA-12444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17778931#comment-17778931
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ASF subversion and git services commented on IMPALA-12444:
----------------------------------------------------------
Commit 1388be8eb8011eaad45327e2da8671a1ff10844e in impala's branch
refs/heads/master from Riza Suminto
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=1388be8eb ]
IMPALA-12510: Floor PlanFragment.maxParallelism_ at 1
IMPALA-12444 introduce a bug where PlanFragment.maxParallelism_ can be
set to 0. This can happen at scan fragment if table is empty. Number of
scan ranges will be 0, which then propagate to
ScanNode.maxScannerThreads_ and PlanFragment.maxParallelism_.
This patch fix it by flooring ScanNode.maxScannerThreads_ and
PlanFragment.maxParallelism_ at 1.
Testing:
- Add select star over an empty table testcase to
PlannerTest.testProcessingCost.
Change-Id: Ibfa50abfdb9cdb994c5c3d7904b377a25f5b8b97
Reviewed-on: http://gerrit.cloudera.org:8080/20606
Reviewed-by: Impala Public Jenkins <[email protected]>
Tested-by: Riza Suminto <[email protected]>
> PROCESSING_COST_MIN_THREADS can get ignored by scan fragment.
> -------------------------------------------------------------
>
> Key: IMPALA-12444
> URL: https://issues.apache.org/jira/browse/IMPALA-12444
> Project: IMPALA
> Issue Type: Bug
> Components: Frontend
> Affects Versions: Impala 4.2.0
> Reporter: Riza Suminto
> Assignee: Riza Suminto
> Priority: Major
> Fix For: Impala 4.4.0
>
>
> There is a bug in PlanFragment.java where scan fragment might not follow
> PROCESSING_COST_MIN_THREADS set by user even if total scan ranges allow to do
> so.
> Frontend planner also need to sanity check such that
> PROCESSING_COST_MIN_THREADS <= MAX_FRAGMENT_INSTANCES_PER_NODE.
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