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From "Rick Branson (JIRA)" <>
Subject [jira] [Created] (CASSANDRA-7594) Disruptor Thrift server worker thread pool not adjustable
Date Wed, 23 Jul 2014 07:10:38 GMT
Rick Branson created CASSANDRA-7594:

             Summary: Disruptor Thrift server worker thread pool not adjustable
                 Key: CASSANDRA-7594
             Project: Cassandra
          Issue Type: Bug
            Reporter: Rick Branson

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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