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From "Philip Thompson (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-7594) Disruptor Thrift server worker thread pool not adjustable
Date Fri, 05 Sep 2014 14:46:29 GMT


Philip Thompson commented on CASSANDRA-7594:

[~xedin] With the new jar, the test is now passing.

> Disruptor Thrift server worker thread pool not adjustable
> ---------------------------------------------------------
>                 Key: CASSANDRA-7594
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Rick Branson
>            Assignee: Pavel Yaskevich
>             Fix For: 2.0.11
>         Attachments: CASSANDRA-7594.patch, disruptor-thrift-server-0.3.6-SNAPSHOT.jar,
jstack.txt, thrift-server-0.3.7-SNAPSHOT.jar
> 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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