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https://issues.apache.org/jira/browse/IMPALA-6460?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Armstrong updated IMPALA-6460:
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Epic Name: Memory-based admission control policies
> More flexible memory-based admission control policies
> -----------------------------------------------------
>
> Key: IMPALA-6460
> URL: https://issues.apache.org/jira/browse/IMPALA-6460
> Project: IMPALA
> Issue Type: Epic
> Components: Distributed Exec
> Affects Versions: Impala 2.11.0
> Reporter: Tim Armstrong
> Assignee: Tim Armstrong
> Priority: Major
> Labels: admission-control
>
> Currently there are only two ways to decided how much memory to reserve for
> each query in memory-based admission control:
> * Using the memory estimates, which often makes bad decisions (e.g. huge
> overestimates) and doesn't have any enforcement on the backend
> * Using a static pool or user-set mem_limit, which is very difficult to set
> to a reasonable value for all queries.
> The memory reservation work will allow us to come up with more powerful and
> flexible polices
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