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From Kevin Burton <bur...@spinn3r.com>
Subject Re: Broker refusing to send messages to only certain queues?
Date Fri, 17 Apr 2015 04:34:31 GMT
On Thu, Apr 16, 2015 at 8:34 PM, Tim Bain <tbain@alumni.duke.edu> wrote:

> If that was happening you'd see the DestinationViewMBean's ExpiredCount
> increasing in the JMX counters, but only if the expiration was happening on
> the broker; as far as I could tell, there's no stat that captures when
> messages expire while they're in the client's prefetch buffer.  (But that's
> just from empirical observation, not code inspection, so I could be wrong
> about that.)
>
>
Yes. I don’t see that.  It’s still set to zero.  The weird thing is that
nothing in JMX really seems odd.

The only behavior I see is that some of my queues grow somewhat large, and
then I don’t receive any messages from them.

If I do this from an external process, I can receive messages. Just not in
my main daemon.

The messages have been stuck there for DAYs now.  I would expect at least
*some* of them to be occasionally executed.

This is with multiple restarts of my daemon.  And I can see that my code is
calling receiveNoWait, it’s just that they never get an answer.


> If you're not seeing DLQ buildup, then that rules out the possibility of
> messages aging off on the broker (as long as you haven't disabled DLQing of
> expired messages via the processExpired property on
> sharedDeadLetterStrategy).  I'm not sure if it rules out the possibility of
> them aging off on the client; I'm not sure if messages get DLQ'ed in that
> situation or simply discarded silently.  We don't use the DLQ at all, so I
> don't have any empirical observations to work from, but maybe someone else
> on the list would know that answer...  But even if it's possible, it
> certainly sounds like a bit of a long shot for explaining what you're
> seeing.
>

Yes.  We have the DLQ on and find it valuable.  But I’m not seeing any
message accumulating there.

I am going to test out using NIO to see if that fixes things. I was
thinking it might be a bug with servicing the queue.  It’s worth a shot at
least.


> While this problem is going on, what are you seeing in JMX?  Which stats
> are increasing, which ones aren't, which ones are going up slower than the
> message count, etc.?
>

That’s just the thing, I don’t see any of the JMX stats changing.  There
are consumers on the queue I see them.  But nothing really stands out.

I’m also going to try to increase the initial redelivery time on a hunch..
They’re not DLQing but maybe they’re just expiring automatically like you
said.  It’s worth a shot.

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