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From Mohit Anchlia <mohitanch...@gmail.com>
Subject Re: Memory limit errors
Date Wed, 02 Jan 2013 19:41:40 GMT
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
>

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