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From Gary Tully <gary.tu...@gmail.com>
Subject Re: Deadlock when using XA and PFC
Date Mon, 07 Oct 2013 10:37:16 GMT
a thread dump of the broker will show you exactly where a thread is
blocked. But if pfc is  the limit, there will be an indication in the
log - slf4j

On 4 October 2013 15:58, dumlebert <kpbe@kth.se> wrote:
> Hi,
> I have an issue that I've battled with for some time now and I'm running out
> of ideas. We're using ActiveMQ from MuleESB. The flow in this case reads a
> message from one queue, splits it into several messages and puts them on
> another queue. All this is done within an XA transaction. The messages are
> up to a few MB each.
>
> When the producer (our flow) has put say 3/5 messages on the queue, it hangs
> when trying to publish the 4th message. This gets into a deadlock, as the
> consumer can't consume the messages until the producer commits, and the
> producer is not allowed to publish the messages it needs to commit the XA
> transaction.
>
> It's logical to think that PFC together with XA could create this kind of
> situation, but I'm unable to verify that it actually is PFC that is stopping
> the producer from publishing all messages. I've tried to:
>  - disable PFC (verified by viewing the attributes through jmx)
>  - set the sendFailIfNoSpace = "true"
>  - increase the memoryUsage, storeUsage and tempUsage to high values
>
> Nothing changes the behaviour.
>
> If I cut the size of the messages to be produced by limiting the amount of
> data they include, all messages a published and the XA commits just fine. So
> the hangup does seem to be related to size.
>
> But then, why is the problem the same when disabling PFC. I must be missing
> something here...
>
> I want to be dead certain on exactly what is the problem that cause the send
> to queue to hang. I'm really thankful for any ideas on how I can figure out
> what is going on.
>
>
>
> --
> View this message in context: http://activemq.2283324.n4.nabble.com/Deadlock-when-using-XA-and-PFC-tp4672276.html
> Sent from the ActiveMQ - User mailing list archive at Nabble.com.



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http://blog.garytully.com

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