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MQSeries.net Forum Index » General IBM MQ Support » Set expiry time for durable pub/sub Topics

Set expiry time for durable pub/sub Topics

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Tristan23

Posted: Wed May 25, 2011 6:40 am Post subject: Set expiry time for durable pub/sub Topics

Newbie

Joined: 25 May 2011
Posts: 9

Hi,

I just created a new "Topic" using MQ Explorer.

Then I wrote some pub/sub JMS code:
...
MQTopicSubscriber subscriber = (MQTopicSubscriber) session.createDurableSubscriber(topic, "mySub");
...

So far this works great.

But then I was asking myself the question: "What happens if a durable subscriber shuts down and never comes back up again?". The messages will be kept forever in the Queue.

Or is there a way to automatically purge messages from a Topic-Queue if they are not read for a too long time?

cheers,
T.

zpat

Posted: Wed May 25, 2011 7:08 am Post subject:

Jedi Council

Joined: 19 May 2001
Posts: 5866
Location: UK

If the messages have an MQMD.expiry value set (by whatever puts them) they can auto-delete themselves.

fjb_saper

Posted: Wed May 25, 2011 9:20 pm Post subject:

Grand High Poobah

Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY

zpat wrote:

If the messages have an MQMD.expiry value set (by whatever puts them) they can auto-delete themselves.

However this is counter pattern for a durable subscriber and the durable pub/sub model. What you should do is find the subscription by looking at the topic and remove it administratively. Then you might need to run some maintenance program in the pub/sub area.

_________________
MQ & Broker admin

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