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From "Eddie Fast (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQCPP-277) Freeze when creating multiple Consumers
Date Tue, 12 Jan 2010 05:24:17 GMT
Freeze when creating multiple Consumers
---------------------------------------

                 Key: AMQCPP-277
                 URL: https://issues.apache.org/activemq/browse/AMQCPP-277
             Project: ActiveMQ C++ Client
          Issue Type: Bug
    Affects Versions: 3.1
         Environment: Windows 7 x64, ActiveMQ Server 5.3, Java 6.0.17, Visual Studio 2008
SP1, Windows 7 SDK, APR 1.3.9
            Reporter: Eddie Fast
            Assignee: Timothy Bish



We create multiple MessageConsumers with different selectors.  This can be upwards of 50 or
so consumers per client.

We recently upgraded to 3.1 from 2.2.2.    We also upgraded our ActiveMQ Server to 5.3 from
5.2.

After upgrading, we've been seeing random, but frequent freezing in our clients.  I've narrowed
it down to where it creates the MessageConsumer and calls setMessageListener();

It seems to be stuck, waiting for a thread to join.

I've modified the main.cpp to exhibit this behavior, but I've only been able to reproduce
it randomly.   It seems to happen more frequently if you stick a breakpoint on this line in
Thread.cpp,  Thread::join():

Thread::join( INFINITE, 0 );


Here's the callstack where it freezes, which is consistent in our clients as well as the main.cpp
example:

 	ntdll.dll!76fff871() 	
 	[Frames below may be incorrect and/or missing, no symbols loaded for ntdll.dll]	
 	ntdll.dll!76fff871() 	
 	KernelBase.dll!75e20816() 	
 	kernel32.dll!755b1138() 	
 	activemq-cppd.dll!decaf::internal::util::concurrent::ConditionImpl::wait(decaf::util::concurrent::ConditionHandle
* condition=0x0239e0e0, __int64 mills=4294967295, __int64 nanos=0)  Line 110 + 0x10 bytes
C++
 	activemq-cppd.dll!decaf::util::concurrent::Mutex::wait(__int64 millisecs=4294967295, int
nanos=0)  Line 124 + 0x20 bytes	C++
 	activemq-cppd.dll!decaf::lang::Thread::join(__int64 millisecs=4294967295, unsigned int nanos=0)
 Line 464 + 0x36 bytes	C++
 	activemq-cppd.dll!decaf::lang::Thread::join()  Line 421	C++
>	activemq-cppd.dll!activemq::threads::DedicatedTaskRunner::shutdown()  Line 83	C++
 	activemq-cppd.dll!activemq::core::ActiveMQSessionExecutor::stop()  Line 110	C++
 	activemq-cppd.dll!activemq::core::ActiveMQSession::stop()  Line 807	C++
 	activemq-cppd.dll!activemq::core::ActiveMQConsumer::setMessageListener(cms::MessageListener
* listener=0x0018fe0c)  Line 523	C++
 	vs2005-activemq-example.exe!HelloWorldConsumer::run()  Line 247 + 0x5b bytes	C++
 	activemq-cppd.dll!decaf::lang::ThreadProperties::runCallback(decaf::lang::ThreadProperties
* properties=0x01df7f68)  Line 133 + 0x11 bytes	C++
 	activemq-cppd.dll!`anonymous namespace'::threadWorker(void * arg=0x01df7f68)  Line 204 +
0x9 bytes	C++
 	msvcr90d.dll!_callthreadstartex()  Line 348 + 0xf bytes	C
 	msvcr90d.dll!_threadstartex(void * ptd=0x01dfafd8)  Line 331	C



To modify main.cpp, it's pretty simple.  Instead of creating 1 MessageConsumer in HelloWorldConsumer::run(),
I've created 50:

{quote}
// put this line with the class variables
std::vector<MessageConsumer*> consumers;

for ( int i = 0; i < 50; i++ )
{{
         // Create a MessageConsumer from the Session to the Topic or Queue
         consumers.push_back( session->createConsumer( destination ) );
         consumers.back()->setMessageListener( this );
}}
{quote}

I'm using the standard .conf for the server.    I've reverted to 2.2.2 and have no issues.

Any ideas?


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