Tim Armstrong resolved IMPALA-6437.
       Resolution: Fixed
    Fix Version/s: Impala 2.12.0
                   Impala 3.0

> increase frequency of admission control topic updates
> -----------------------------------------------------
>                 Key: IMPALA-6437
>                 URL: https://issues.apache.org/jira/browse/IMPALA-6437
>             Project: IMPALA
>          Issue Type: Improvement
>          Components: Distributed Exec
>            Reporter: Tim Armstrong
>            Assignee: Tim Armstrong
>            Priority: Major
>              Labels: admission-control, resource-management
>             Fix For: Impala 3.0, Impala 2.12.0
> Currently admission controls don't have a globally consistent view of how 
> many queries have admitted so different coordinators can over-admit if 
> queries arrive at multiple coordinators in-between topic updates. Topic 
> updates happen every 2s by default. Worse, admission control topic updates 
> can get stuck behind large catalog updates.
> IMPALA-3649 proposes having a globally consistent view of admission control, 
> which will require architectural changes.
> In the meantime we could reduce the problem by increasing the frequency of 
> topic updates for admission control and separating them from the larger 
> catalog updates.

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