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From Mohit Anchlia <mohitanch...@gmail.com>
Subject Re: Memory limit errors
Date Thu, 03 Jan 2013 15:57:32 GMT
Yes it's really helpful. Thanks again

On Thu, Jan 3, 2013 at 5:33 AM, Christian Posta
<christian.posta@gmail.com>wrote:

> 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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