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Posted to issues-all@impala.apache.org by "Tim Armstrong (Jira)" <ji...@apache.org> on 2020/06/01 19:16:00 UTC
[jira] [Updated] (IMPALA-9586) Update query option docs to account
for interactions with mt_dop
[ https://issues.apache.org/jira/browse/IMPALA-9586?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Tim Armstrong updated IMPALA-9586:
----------------------------------
Description:
in some cases mt_dop changes the behaviour of other options or makes them a no-op. We need to update docs to reflect this.
* Setting NUM_NODES=1 along with MT_DOP >=1 effectively reduces MT_DOP to 1, i.e. only one thread is used.
* NUM_SCANNER_THREADS has no effect when MT_DOP>=1
*
was:in some cases mt_dop changes the behaviour of other options or makes them a no-op. E.g. num_scanner_threads has no effect. We need to update docs to reflect this.
> Update query option docs to account for interactions with mt_dop
> ----------------------------------------------------------------
>
> Key: IMPALA-9586
> URL: https://issues.apache.org/jira/browse/IMPALA-9586
> Project: IMPALA
> Issue Type: Improvement
> Components: Docs
> Reporter: Tim Armstrong
> Priority: Major
>
> in some cases mt_dop changes the behaviour of other options or makes them a no-op. We need to update docs to reflect this.
> * Setting NUM_NODES=1 along with MT_DOP >=1 effectively reduces MT_DOP to 1, i.e. only one thread is used.
> * NUM_SCANNER_THREADS has no effect when MT_DOP>=1
> *
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