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MQSeries.net Forum Index » General IBM MQ Support » Publish Subscribe Message with No Subscriber

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vineet.rawat
PostPosted: Wed Mar 15, 2006 12:58 pm    Post subject: Publish Subscribe Message with No Subscriber Reply with quote

Apprentice

Joined: 08 Aug 2005
Posts: 36
What happens to the messages that are published with no subscribers?

Will these messages will be put into DEAD LETTER QUEUE ?

Coz according to MQ concept these messages should be stored somewhere in case of failure
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fjb_saper
PostPosted: Wed Mar 15, 2006 1:20 pm    Post subject: Re: Publish Subscribe Message with No Subscriber Reply with quote

Grand High Poobah

Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
vineet.rawat wrote:
What happens to the messages that are published with no subscribers?

Will these messages will be put into DEAD LETTER QUEUE ?

Coz according to MQ concept these messages should be stored somewhere in case of failure


No. The message just disappears. There is no failure if there is no subscriber. It's like shouting in a sound proof room. Nobody cares. It it the way it is designed.
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mvic
PostPosted: Wed Mar 15, 2006 4:32 pm    Post subject: Re: Publish Subscribe Message with No Subscriber Reply with quote

Jedi

Joined: 09 Mar 2004
Posts: 2080
vineet.rawat wrote:
What happens to the messages that are published with no subscribers?

A message is stored for
* each connected subscriber
* each nonconnected durable subscription

If there are no connected subscribers, and no durable subscriptions, no messages are stored.

This rule may well bend if using "retained" publications - I'm not so clear on this without reading up about it in the manual.

If you're using JMS or XMS, then retained publications are not relevant anyway.
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