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https://issues.apache.org/jira/browse/IMPALA-988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16795894#comment-16795894
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ASF subversion and git services commented on IMPALA-988:
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Commit 6aacfd849a7fb07bc199e3fe3503eb5bcb0e410c in impala's branch
refs/heads/branch-3.2.0 from Alex Rodoni
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=6aacfd8 ]
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 <[email protected]>
Reviewed-by: Paul Rogers <[email protected]>
> 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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