Flexible thread pool for RPC server
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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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