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From "Timothy Bish (JIRA)" <j...@apache.org>
Subject [jira] Commented: (AMQCPP-277) Freeze when creating multiple Consumers
Date Mon, 18 Jan 2010 15:36:44 GMT

    [ https://issues.apache.org/activemq/browse/AMQCPP-277?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=56975#action_56975
] 

Timothy Bish commented on AMQCPP-277:
-------------------------------------

I've not been able to reproduce this one yet.  

One thing you could try is to not start the connection until after creating that amount of
consumers.  Each time you create a consumer and set a listener on it, it must stop message
delivery for all consumers on the session which can be heavy process if there are a large
number of consumers.  

I'm going to keep trying to recreate the lockup.

> 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
>             Fix For: 3.2.0
>
>
> 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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