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https://issues.apache.org/jira/browse/IMPALA-7389?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Armstrong resolved IMPALA-7389.
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Resolution: Duplicate
I guess I filed two version of this - IMPALA-7486
> Admission control should set aside less memory on dedicated coordinator if
> coordinator fragment is lightweight
> --------------------------------------------------------------------------------------------------------------
>
> Key: IMPALA-7389
> URL: https://issues.apache.org/jira/browse/IMPALA-7389
> Project: IMPALA
> Issue Type: Improvement
> Components: Distributed Exec
> Affects Versions: Impala 3.0, Impala 2.12.0
> Reporter: Tim Armstrong
> Priority: Major
> Labels: admission-control, resource-management
>
> The current admission control treats all backends symmetrically and sets
> aside the mem_limit. This makes sense for now given that we have the same
> mem_limit setting for all backends.
> One case where this could be somewhat problematic is if you have dedicated
> coordinators with less memory than the executors, because the coordinator's
> process memory limit will be fully admitted before the executors.
> If you have multiple coordinators and queries are distributed between them
> this is relatively unlikely to become a problem. If you have a single
> coordinator this is more of an issue.
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