Jon Meredith commented on CASSANDRA-15277:

I went ahead and changed SEPExecutor to understand negative permits as resizing 
and give up their work permits, added support for nodetool to get/set 
concurrency, tried to clear up confusion with the JMXEnabledThreadPoolExecutor 
pool size getters/setters and cleaned up the unnecessary 
JMXConfigurableThreadPoolExecutor as it doesn't add anything to 
JMXEnabledPoolExecutor any more.

> Make it possible to resize concurrent read / write thread pools at runtime
> --------------------------------------------------------------------------
>                 Key: CASSANDRA-15277
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-15277
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Local/Other
>            Reporter: Jon Meredith
>            Assignee: Jon Meredith
>            Priority: Normal
>              Labels: pull-request-available
>          Time Spent: 20m
>  Remaining Estimate: 0h
> To better mitigate cluster overload the executor services for various stages 
> should be configurable at runtime (probably as a JMX hot property). 
> Related to CASSANDRA-5044, this would add the capability to resize to 
> multiThreadedLowSignalStage pools based on SEPExecutor.

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