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Posted to issues-all@impala.apache.org by "ASF subversion and git services (JIRA)" <ji...@apache.org> on 2019/03/12 00:36:00 UTC
[jira] [Commented] (IMPALA-988) Join strategy (broadcast vs
shuffle) decision does not take mem limit and other joins into account
[ https://issues.apache.org/jira/browse/IMPALA-988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16790102#comment-16790102 ]
ASF subversion and git services commented on IMPALA-988:
--------------------------------------------------------
Commit 9cc75c59d5a09bd8cccc98bdf05cc64a98a70ffd in impala's branch refs/heads/master from Alex Rodoni
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=9cc75c5 ]
IMPALA-8133: [DOCS] Review and update Known Issues for 3.2
- Added IMPALA-988
- Reviewed the Known Issues from 3.1 and updated the ones fixed in 3.2
Change-Id: Ia6b22fc5cf3944ffeeaf8189932e88498a14696e
Reviewed-on: http://gerrit.cloudera.org:8080/12718
Tested-by: Impala Public Jenkins <im...@cloudera.com>
Reviewed-by: Paul Rogers <pr...@cloudera.com>
> Join strategy (broadcast vs shuffle) decision does not take mem limit and other joins into account
> --------------------------------------------------------------------------------------------------
>
> Key: IMPALA-988
> URL: https://issues.apache.org/jira/browse/IMPALA-988
> Project: IMPALA
> Issue Type: Improvement
> Components: Frontend
> Affects Versions: Impala 1.2.1
> Reporter: Alan Choi
> Priority: Minor
> Labels: resource-management
>
> The amount of available memory changes the trade-off between partitioned and shuffle join strategies: if switching to shuffle join can avoid spilling to disk, it may be worth paying the cost of the additional network transfer.
> There are two issues:
> 1. Join strategy decision only takes query mem-limit into account but ignore process mem-limit.
> 2. Join strategy decision does not take other joins of the same query into account. When multiple joins are present, it'll go over the mem-limit.
> Note that when IMPALA-3200 is completed, this shouldn't prevent the query running to completion, but still affects performance.
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