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From Gary Tully <gary.tu...@gmail.com>
Subject Re: How can we obtain automatic removal of expired messages from queues?
Date Thu, 10 Dec 2009 09:40:32 GMT
yea, currently the expiry is overridden before the message is sent to the
DLQ. That could be made configurable which would help. I wonder, would it
make sense to reset the expiry or just set it to represent any remaining
time. If that is the best solution for you, please raise a jira issue to
track it.

Do you really want a DLQ at all, a null strategy in a policy entry will
result in no dispatch to the DLQ.
Also, take a look at the dlq discarding plugin added via
http://issues.apache.org/activemq/browse/AMQ-1892

It overrides the sendToDLQ broker operation to make it more configurable.

2009/12/10 Fred Moore <fred.moore77@gmail.com>

> Bruce, All,
>
> thanks for the answer, that almost solved my problem indeed.
>
> There is a additional aspect which is still unsolved and is related to
> "poison pill" messages that end up in DLQ *before* their expiration time is
> reached...
>
> In fact when these messages land in DLQ the expiration is reset to "never"
> (while the original expiration details are stored in originalExpiration)
> and
> thus they become non disposble waste: which in a highly unattended system
> should be avoided.
>
> Is there a way of letting DLQ-ed poison pill messages expire?
>
> Cheers,
> F.
>
>
>
> On Fri, Dec 4, 2009 at 8:36 PM, Bruce Snyder <bruce.snyder@gmail.com>
> wrote:
>
> >  On Fri, Dec 4, 2009 at 9:38 AM, Fred Moore <fred.moore77@gmail.com>
> > wrote:
> > > Hi folks,
> > >
> > > this is probably easy but we not able to figure it out: we have
> producers
> > > setting msg expiration and msgs ending up in DLQ upon expiration (with
> > their
> > > expiration reset to "never").
> > >
> > > How can I set things up in a way such that expired msgs will simply
> > > disappear for good automatically (without going into a DLQ together
> with
> > > msgs discarded for more unexpected reasons)?
> >
> > Just to clarify, I think you're asking for expired messages to simply
> > be discarded instead of being sent to the DLQ. To achieve this, you'll
> > need to set the processExpired property to false in the dead letter
> > strategy. Below is an example of how to configure this in the
> > activemq.xml:
> >
> > <destinationPolicy>
> >  <policyMap>
> >    <policyEntries>
> >      <!-- Set the following policy on all queues using the '>' wildcard
> -->
> >      <policyEntry queue=">">
> >        <!-- Tell the dead letter strategy not to process expired messages
> >              so that they will just be discarded -->
> >        <deadLetterStrategy processExpired="false" />
> >      </policyEntry>
> >    </policyEntries>
> >  </policyMap>
> > </destinationPolicy>
> >
> > Bruce
> > --
> > perl -e 'print
> > unpack("u30","D0G)U8V4\@4VYY9&5R\"F)R=6-E+G-N>61E<D\!G;6%I;\"YC;VT*"
> > );'
> >
> > ActiveMQ in Action: http://bit.ly/2je6cQ
> > Blog: http://bruceblog.org/
> > Twitter: http://twitter.com/brucesnyder
> >
>



-- 
http://blog.garytully.com

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