Eli Levine created PHOENIX-1091:
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Summary: 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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