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From "Keith Wall (JIRA)" <j...@apache.org>
Subject [jira] [Created] (QPID-3498) Broker race condition mean that it tries to respond before IoSender thread is running
Date Wed, 21 Sep 2011 15:09:08 GMT
Broker race condition mean that it tries to respond before IoSender thread is running
-------------------------------------------------------------------------------------

                 Key: QPID-3498
                 URL: https://issues.apache.org/jira/browse/QPID-3498
             Project: Qpid
          Issue Type: Bug
          Components: Java Broker
            Reporter: Keith Wall
            Assignee: Keith Wall
             Fix For: 0.13


Since the removal of Mina from the transport layer, we've been seeing sporadic failures from
the java-mms-spawn.0-9-1 profile on an old slow CI server.

Tests are failing with the following exception whilst the client is attempting to negotiate
downwards from 0-10 to 0-9-1 protocol during connection:

{code}
main 2011-09-21 14:27:09,139 INFO [apache.qpid.client.AMQConnection] Unable to connect to
broker at tcp://localhost:15672
org.apache.qpid.AMQException: Cannot connect to broker: connect() aborted [error code 200:
reply success]
        at org.apache.qpid.client.AMQConnectionDelegate_0_10.makeBrokerConnection(AMQConnectionDelegate_0_10.java:218)
        at org.apache.qpid.client.AMQConnection.makeBrokerConnection(AMQConnection.java:565)
        at org.apache.qpid.client.AMQConnection.<init>(AMQConnection.java:351)
        at org.apache.qpid.client.AMQConnectionFactory.createConnection(AMQConnectionFactory.java:132)
        at org.apache.qpid.client.AMQConnectionFactory.createConnection(AMQConnectionFactory.java:111)
        at org.apache.qpid.test.utils.QpidBrokerTestCase.getConnection(QpidBrokerTestCase.java:1056)
        at org.apache.qpid.test.unit.basic.LargeMessageTest.setUp(LargeMessageTest.java:52)
        at junit.framework.TestCase.runBare(TestCase.java:125)
        at org.apache.qpid.test.utils.QpidBrokerTestCase.runBare(QpidBrokerTestCase.java:238)
        at junit.framework.TestResult$1.protect(TestResult.java:106)
        at junit.framework.TestResult.runProtected(TestResult.java:124)
{code}

Analysis has shown that when the problem occurs, the broker tries to write the highest supported
protocol version number to the wire, but these bytes never make it to the wire (see MultiVersionProtocolEngine#received()
lines 409-414).   The reason for this is a race condition: there is an unlucky timing where
the broker may begin responding to incoming frames *before* it has started the IoSender thread.



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