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https://issues.apache.org/jira/browse/PHOENIX-1091?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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James Taylor resolved PHOENIX-1091.
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Resolution: Not a Problem
> Implement hard ceiling on per-query concurrency
> -----------------------------------------------
>
> Key: PHOENIX-1091
> URL: https://issues.apache.org/jira/browse/PHOENIX-1091
> Project: Phoenix
> Issue Type: Bug
> Affects Versions: 3.0.0, 4.0.0
> Reporter: Eli Levine
>
> Phoenix has targetConcurrency and maxConcurrency configuration settings.
> However, it seems that they only come into effect when they are higher than
> the number of regions. In clients operating over tables with a large number
> of regions this could result in the consumption of a large number of
> client-side threads per query, potentially leading to starvation of other
> queries in Phoenix clients that support concurrent queries (such as highly
> multi-tenant environments).
> Implementation of a hard per-query concurrency limit is suggested to avoid
> potential starvation due to each query taking too many client threads.
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