[jira] [Created] (HBASE-23744) FastPathBalancedQueueRpcExecutor should enforce queue length of 0

["Geoffrey Jacoby (Jira)" <ji...@apache.org>]

Geoffrey Jacoby created HBASE-23744:
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             Summary: FastPathBalancedQueueRpcExecutor should enforce queue length of 0
                 Key: HBASE-23744
                 URL: https://issues.apache.org/jira/browse/HBASE-23744
             Project: HBase
          Issue Type: Bug
            Reporter: Geoffrey Jacoby
            Assignee: Geoffrey Jacoby


FastPathBalancedQueueRpcExecutor allows RPC requests to skip the RPC queue and get worked by an available handler under certain circumstances. 

Relatedly, the hbase.ipc.server.max.callqueue.length parameter can be set to 0, including dynamically. When this is the case the executor is supposed to block all dispatching. However, the FastPathBalancedQueueRpcExecutor will still dispatch the request if one of the "fast path" handlers is available on its stack. This both isn't the desired effect, and also makes TestSimpleRpcExecutor.testSoftAndHardQueueLimits unstable when it checks the queue length 0 behavior. 

A simple fix is just to check max queue length > 0 before FastPathBalancedQueueRpcExecutor pops the fast handler off the stack. 



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