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From "paul normington (JIRA)" <j...@apache.org>
Subject [jira] Commented: (AMQ-1020) Slow consumer terminally blocks both client and broker
Date Tue, 05 Dec 2006 19:31:02 GMT
    [ https://issues.apache.org/activemq/browse/AMQ-1020?page=comments#action_37631 ] 
            
paul normington commented on AMQ-1020:
--------------------------------------


I have run into this same issue I think.

We have a scenario with a DurableSubscriber that has retrieved some messages and then disconnects.
The publisher continuous publishing at 1000 messages per second.
After 60000 messages are sent, the publisher hangs, and the broker quiesces.

I have seen this behavior with 4.0.1 and 4.1.0

I took a stack trace which showed the server was stuck in UsageManager.waitForSpace().

I can delay the hanging problem by configuring more memory in the MemoryManager.
I have tried setting timeToLives and pendingMessageLimitStrategies but I still get the hanging.

If I use a non durable subscriber the problem goes away, but this is not an ideal solution
for us.

> Slow consumer terminally blocks both client and broker
> ------------------------------------------------------
>
>                 Key: AMQ-1020
>                 URL: https://issues.apache.org/activemq/browse/AMQ-1020
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 4.0.2
>         Environment: Broker: Windows XP, Sun JDK1.5  Client: activemq-dotnet (Trunk)
>            Reporter: Rob Lugt
>
> I have a multi-threaded client (client1) which is acting as both a publisher (Topic1)
and subscriber (Topic2) using a single session.  There is another client process (client2)
which publishes on Topic2.
> I have witnessed the following repeatable scenario where both clients get stuck, which
can only be rectified by restarting the broker! :-
> Client1 publishes messages to Topic1 (rate = about 30 msgs/sec).
> Client2 publishes bursts of messages to Topic2 (rate = 500 msgs/sec) 
> Client1 is a slow subscriber on Topic2
> After running in this scenario for a couple of seconds, Client1 and Client2 become stuck.
 Looking at a stack trace for Client1 I can see that it's read_loop is stuck waiting for input,
and it's publisher thread is stuck waiting for an acknowledgement to the synchronous message
send (the acknowledgement never arrives because the broker won't sent any more messages).
> Client2 is also stuck waiting for an acknowledgement to a synchronous send.
> My perception is that it appears the broker is throttling the connection because the
consumer is running slowly, but for some reason it gets into a state where all message flow
stops (even though the consumer is automatically acknowledging messages, albeit slowly). 
Furthermore, if I kill Client1 the broker doesn't recover (using a JMX console the connection
remains visible).
> The broker uses a vanilla configuration (i.e. no policies are set for the topics in quedtion).
>  

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