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https://issues.apache.org/jira/browse/CASSANDRA-7594?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14076805#comment-14076805
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Pavel Yaskevich commented on CASSANDRA-7594:
--------------------------------------------
[~rbranson] That was on my list for a while now but nobody seemed to care so I
de-prioritized it, thanks for reporting! I'm currently OOO but will try to look
into it ASAP.
> Disruptor Thrift server worker thread pool not adjustable
> ---------------------------------------------------------
>
> Key: CASSANDRA-7594
> URL: https://issues.apache.org/jira/browse/CASSANDRA-7594
> Project: Cassandra
> Issue Type: Bug
> Reporter: Rick Branson
> Assignee: Pavel Yaskevich
>
> For the THsHaDisruptorServer, there may not be enough threads to run blocking
> StorageProxy methods. The current number of worker threads is hardcoded at 2
> per selector, so 2 * numAvailableProcessors(), or 64 threads on a 16-core
> hyperthreaded machine. StorageProxy methods block these threads, so this puts
> an upper bound on the throughput if hsha is enabled. If operations take 10ms
> on average, the node can only handle a maximum of 6,400 operations per
> second. This is a regression from hsha on 1.2.x, where the thread pool was
> tunable using rpc_min_threads and rpc_max_threads.
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