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Posted to issues-all@impala.apache.org by "ASF subversion and git services (Jira)" <ji...@apache.org> on 2020/03/31 20:51:00 UTC
[jira] [Commented] (IMPALA-9099) Allow setting mt_dop manually for
queries with joins
[ https://issues.apache.org/jira/browse/IMPALA-9099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17072146#comment-17072146 ]
ASF subversion and git services commented on IMPALA-9099:
---------------------------------------------------------
Commit ab7e209d1bf8f8d61e092b6de9078c0d2e8c657d in impala's branch refs/heads/master from Tim Armstrong
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=ab7e209 ]
IMPALA-9099: allow mt_dop for joins without feature flag
This allows running *any* read-only query with mt_dop > 0.
Before this patch, no joins were allowed with mt_dop > 0.
Previous patches, particularly IMPALA-9156, added significantly
more code coverage for multithreading+joins. It should be safe to
allow enabling on a query-by-query basis. Many improvements are
still planned - see IMPALA-3902. So behaviour and performance
characteristics of mt_dop > 0 with more complex plans and joins
will continue to change.
Testing:
Updated the mt_dop validation tests and remove redundant planner test
that doesn't provide much additional coverage of the validation
support.
Ran exhaustive tests.
Change-Id: I9c6566abb239db0e775f2beaa25a62c36313cd6f
Reviewed-on: http://gerrit.cloudera.org:8080/15545
Reviewed-by: Impala Public Jenkins <im...@cloudera.com>
Tested-by: Impala Public Jenkins <im...@cloudera.com>
> Allow setting mt_dop manually for queries with joins
> ----------------------------------------------------
>
> Key: IMPALA-9099
> URL: https://issues.apache.org/jira/browse/IMPALA-9099
> Project: IMPALA
> Issue Type: New Feature
> Reporter: Tim Armstrong
> Assignee: Tim Armstrong
> Priority: Major
> Labels: multithreading
>
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