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From Christian Posta <christian.po...@gmail.com>
Subject Re: Memory limit errors
Date Thu, 03 Jan 2013 13:33:22 GMT
Good call Claus. I've updated the wiki page here:

http://activemq.apache.org/how-do-i-find-the-size-of-a-queue.html

Should be a couple hours to propagate through.

Thanks!


On Thu, Jan 3, 2013 at 1:05 AM, Claus Ibsen <claus.ibsen@gmail.com> wrote:

> On Wed, Jan 2, 2013 at 9:33 PM, Christian Posta
> <christian.posta@gmail.com> wrote:
> > Enqueue count = number of messages sent to the queue
> > Dequeue count = number of messages ack'd by the consumer
> > Inflight count = number of messages sent to consumer's session (and are
> not
> > ack'd by consumer)
> > Dispatch count = messages sent to the consumer (dequeue + inflight)
> >
>
> Nice summary. Christian I think you should add that as a FAQ
> http://activemq.apache.org/faq
>
>
> > I asked about the async sends because the producer flow control you hit
> was
> > the kind that will block the entire connection (instead of just blocking
> > that one producer).
> >
> >
> >
> >
> >
> > On Wed, Jan 2, 2013 at 12:41 PM, Mohit Anchlia <mohitanchlia@gmail.com
> >wrote:
> >
> >> Thanks again! Is the dispatch queue size the one that relates to what's
> >> held in memory?
> >>
> >> We are using mule and the endpoint has no transactions configured. What
> did
> >> you mean by forcing async?
> >>
> >> On Wed, Jan 2, 2013 at 11:06 AM, Christian Posta
> >> <christian.posta@gmail.com>wrote:
> >>
> >> > Correct. The memoryUsage is increased when messages are held in
> memory.
> >> > This happens when messages are paged in from the store. They are then
> >> > dispatched to consumers and held until the consumer acks.
> >> >
> >> > In your case looks like a particular destination (eventsEndpoint) is
> >> > filling up somehow. Can you look in JMX and see how many enqueued,
> >> > dispatched, dequeued, inflight etc? Also check to see how many
> >> > subscriptions to that destination, and see what those dispatch-counter
> >> and
> >> > dispatch queue size looks like.
> >> >
> >> > BTW any chance you're sending (producers) using a transaction, or
> forcing
> >> > sends to be async?
> >> >
> >> >
> >> >
> >> > On Wed, Jan 2, 2013 at 11:51 AM, Mohit Anchlia <
> mohitanchlia@gmail.com
> >> > >wrote:
> >> >
> >> > > So if I understand correctly I shouldn't be seeing this behaviour
> >> unless
> >> > > something is being held in memory. We ack immediately so I am kind
> of
> >> > > wondering what might be going on here. Is there a way to find out
> what
> >> > > might be happening here?
> >> > >
> >> > > On Wed, Jan 2, 2013 at 10:03 AM, Christian Posta
> >> > > <christian.posta@gmail.com>wrote:
> >> > >
> >> > > > What info can you provide about how clients are consuming from
the
> >> > > queues?
> >> > > > Any chance there are a bunch of messages "inflight" which haven't
> >> been
> >> > > > ack'd by the consumer?
> >> > > >
> >> > > >
> >> > > > On Wed, Jan 2, 2013 at 10:20 AM, Mohit Anchlia <
> >> mohitanchlia@gmail.com
> >> > > > >wrote:
> >> > > >
> >> > > > > I see these messages being logged. Queues are setup to use
> >> persistent
> >> > > > > store. I am wondering what's causing this messages to get
> blocked.
> >> I
> >> > > see
> >> > > > > there is a memoryLimit but if I am using persistent=true
then
> >> should
> >> > > this
> >> > > > > be the desired behaviour?
> >> > > > >
> >> > > > >
> >> > > > > 2013-01-02 05:06:13,388 | INFO |
> >> > > > > Usage(default:memory:queue://eventsEndpoint:memory)
> >> percentUsage=0%,
> >> > > > > usage=0, limit=20971520,
> >> > > > > percentUsageMinDelta=1%;Parent:Usage(default:memory)
> >> > percentUsage=106%,
> >> > > > > usage=22366029, limit=20971520, percentUsageMinDelta=1%:
Usage
> >> > Manager
> >> > > > > Memory Limit reached. Producer
> >> > > > > (ID:pfdamq301.ie.net-54582-1351809386355-2:1:1:1) stopped
to
> >> prevent
> >> > > > > flooding queue://eventsEndpoint. See
> >> > > > >
> >> > > > >
> >> > > > >    <broker xmlns="http://activemq.apache.org/schema/core"
> >> > > > > brokerName="static-broker1" persistent="true"
> >> > > > > dataDirectory="${activemq.data}">
> >> > > > >
> >> > > > >         <!-- Destination specific policies using destination
> names
> >> or
> >> > > > > wildcards -->
> >> > > > >         <destinationPolicy>
> >> > > > >             <policyMap>
> >> > > > >                 <policyEntries>
> >> > > > >                     <policyEntry queue=">"
> >> producerFlowControl="true"
> >> > > > > memoryLimit="20mb">
> >> > > > >                         <deadLetterStrategy>
> >> > > > >                           <individualDeadLetterStrategy
> >> > > > queuePrefix="DLQ."
> >> > > > > useQueueForQueueMessages="true" />
> >> > > > >                         </deadLetterStrategy>
> >> > > > >                     </policyEntry>
> >> > > > >                     <policyEntry topic=">"
> >> producerFlowControl="true"
> >> > > > > memoryLimit="20mb">
> >> > > > >                     </policyEntry>
> >> > > > >                 </policyEntries>
> >> > > > >             </policyMap>
> >> > > > >         </destinationPolicy>
> >> > > > >
> >> > > > >         <!-- Use the following to configure how ActiveMQ
is
> exposed
> >> > in
> >> > > > JMX
> >> > > > > -->
> >> > > > >         <managementContext>
> >> > > > >             <managementContext createConnector="true"/>
> >> > > > >         </managementContext>
> >> > > > >
> >> > > >
> >> > > >
> >> > > >
> >> > > > --
> >> > > > *Christian Posta*
> >> > > > http://www.christianposta.com/blog
> >> > > > twitter: @christianposta
> >> > > >
> >> > >
> >> >
> >> >
> >> >
> >> > --
> >> > *Christian Posta*
> >> > http://www.christianposta.com/blog
> >> > twitter: @christianposta
> >> >
> >>
> >
> >
> >
> > --
> > *Christian Posta*
> > http://www.christianposta.com/blog
> > twitter: @christianposta
>
>
>
> --
> Claus Ibsen
> -----------------
> Red Hat, Inc.
> FuseSource is now part of Red Hat
> Email: cibsen@redhat.com
> Web: http://fusesource.com
> Twitter: davsclaus
> Blog: http://davsclaus.com
> Author of Camel in Action: http://www.manning.com/ibsen
>



-- 
*Christian Posta*
http://www.christianposta.com/blog
twitter: @christianposta

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