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| MQ V7.0 Cluster JMS - PUB/SUB - Low Performance |
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| gbeardall |
 Posted: Mon Oct 06, 2008 8:02 am Post subject: |
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Newbie
Joined: 06 Oct 2008
Posts: 2
Location: IBM, Hursley
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Hi,
By default topics have NPMSGDLV(ALLAVAIL) which means that a failure to deliver a msg to a given subscriber will not report a problem. Try altering the topic defn to use NPMSGDLV(ALL) so that delivery failures will be reported back via put/publish calls. |
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| tof |
| Posted: Mon Oct 06, 2008 9:58 am Post subject: |
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Novice
Joined: 29 Sep 2008
Posts: 14
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| gbeardall wrote: |
Hi,
By default topics have NPMSGDLV(ALLAVAIL) which means that a failure to deliver a msg to a given subscriber will not report a problem. Try altering the topic defn to use NPMSGDLV(ALL) so that delivery failures will be reported back via put/publish calls. |
Hi gbeardall and thanks for the hint.
I've tried out your suggestion and surprisingly I get no error messages.
At first I though it was because of :
| Code: |
topic.setPutAsyncAllowed(JMSC.MQJMS_PUT_ASYNC_ALLOWED_ENABLED);
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But I took it away and still didn't get any errors: messages keep getting distributed evenly between QM1 and QM2. No exceptions on JMS clients nor errors in /var/mqm/errors
g |
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| gbeardall |
| Posted: Wed Oct 08, 2008 4:56 am Post subject: |
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Newbie
Joined: 06 Oct 2008
Posts: 2
Location: IBM, Hursley
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As you are using non-persistent msgs it is possible for the channel to discard them if a problem occurs, as the channel default is NPMSPEED(FAST). However, probably the first thing to do is to define a dead-letter queue on all your qmgrs using the 'crtmqm -u SYSTEM.DEAD.LETTER.QUEUE' (or alter the qmgr DEADQ defn) which will mean that if the channel, or other processes, discards a non-persistent message it will try and put it on that queue. Btw, make sure you haven't specified a report option of discard on your publications otherwise they won't be dead-lettered.
You could also change your channel definitions to have NPMSPEED(NORMAL) which cause msgs to be sent under syncpoint. |
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