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Posted to issues-all@impala.apache.org by "Lars Volker (JIRA)" <ji...@apache.org> on 2018/09/21 17:48:00 UTC
[jira] [Updated] (IMPALA-7592) Planner should correctly estimate
UnionNode host count
[ https://issues.apache.org/jira/browse/IMPALA-7592?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Lars Volker updated IMPALA-7592:
--------------------------------
Labels: scheduling (was: )
> Planner should correctly estimate UnionNode host count
> ------------------------------------------------------
>
> Key: IMPALA-7592
> URL: https://issues.apache.org/jira/browse/IMPALA-7592
> Project: IMPALA
> Issue Type: Improvement
> Components: Frontend
> Affects Versions: Impala 3.0
> Reporter: Balazs Jeszenszky
> Priority: Major
> Labels: scheduling
>
> Currently, the planner estimates UnionNode host count to be the maximum of all its children. In reality, scheduler will put these nodes on the union of its inputs' hosts. We should update the planner to correctly account for this behaviour.
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