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https://issues.apache.org/jira/browse/IMPALA-9077?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bikramjeet Vig resolved IMPALA-9077.
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Target Version: Impala 4.0
Resolution: Fixed
> Fix scalable admission config for clusters with dedicated coordinators
> ----------------------------------------------------------------------
>
> Key: IMPALA-9077
> URL: https://issues.apache.org/jira/browse/IMPALA-9077
> Project: IMPALA
> Issue Type: Bug
> Affects Versions: Impala 3.3.0
> Reporter: Bikramjeet Vig
> Assignee: Bikramjeet Vig
> Priority: Major
>
> The scalable configs are:
> Max Memory Multiple
> Max Running Queries Multiple
> Max Queued Queries Multiple
> Currently the scalable configs scale based on number of total executors. This
> can work for max running or queued queries multiple, but for "Max Memory
> Multiple" this will cause the following problem:
> Consider the following cluster composed of 2 dedicated coordinators and 2
> executors. For a regular query that will run on 2 executors and 1
> coordinator, if the memory to admit per backend is 100MB, the cluster memory
> to be admitted will be 300MB. Now if the max_memory_multiple is 120MB this
> query will not be admitted because the scalable max memory will be 120*2 =
> 240.
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