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https://issues.apache.org/jira/browse/HBASE-2141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12801497#action_12801497
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Jean-Daniel Cryans commented on HBASE-2141:
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This also helps with debugging jstacks so that if the user never uses 100
handlers but configured 100 then it's more pain to read through.
> Flexible thread pool for RPC server
> -----------------------------------
>
> Key: HBASE-2141
> URL: https://issues.apache.org/jira/browse/HBASE-2141
> Project: Hadoop HBase
> Issue Type: Improvement
> Reporter: Andrew Purtell
> Fix For: 0.21.0
>
>
> Having a bounded thread pool is important, so availability can degrade
> gracefully (more or less), as opposed to the whole regionserver becoming
> livelocked. But, we don't need for the pool to be preallocated as is done
> currently. How about changing the RPC server thread pool such that the user
> can specify a minimum and maximum number of handler threads? The pool would
> start with the minimum, allocate more up to the max to handle additional
> concurrency, then terminate unused threads after some time back down to the
> minimum. Then we can do things like set a maximum of 100 handlers or such
> without taking on the overhead of 100 threads until it is needed.
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