ASG
IBM
Zystems
Cressida
Icon
Netflexity
 
  MQSeries.net
Search  Search       Tech Exchange      Education      Certifications      Library      Info Center      SupportPacs      LinkedIn  Search  Search                                                                   FAQ  FAQ   Usergroups  Usergroups
 
Register  ::  Log in Log in to check your private messages
 
RSS Feed - WebSphere MQ Support RSS Feed - Message Broker Support

MQSeries.net Forum Index » IBM MQ Java / JMS » Connection problems

Post new topic  Reply to topic
 Connection problems « View previous topic :: View next topic » 
Author Message
ptolomeoo
PostPosted: Fri Mar 31, 2017 2:04 am    Post subject: Reply with quote

Newbie

Joined: 31 Mar 2017
Posts: 3

Hello, I'm seeking help on this issue.

I have a consumer (based on listener) that eventually stops receiving events from the MQSeries queue.

The consumer keeps working (traces show it's alive) and the queue keeps receiving messages but the consumer is like a zombie, and doesn't consume any message.

When doing tests, we had no problems detecting disconnections or the queue being shut down, and it keeps trying to reconnect until the queue is up again.

Because of this problem, we wanted to try a different and more robust approach:
- Polling continuously for messages, and disconnecting and reconnecting if we end the timeout without receiving any message.
- Keeping the listener approach doing a ping to the queue every 'x' minutes. This would guarantee that the queue is up, but wouldn't guarantee that we keep receiving the events.

What are your expert recommendations to solve this polling problem? I don't trust the event listener and want a secondary, backup to test if my connection is OK.
Back to top
View user's profile Send private message
fjb_saper
PostPosted: Fri Mar 31, 2017 2:32 am    Post subject: Reply with quote

Grand High Poobah

Joined: 18 Nov 2003
Posts: 20695
Location: LI,NY

ptolomeoo wrote:
Hello, I'm seeking help on this issue.

I have a consumer (based on listener) that eventually stops receiving events from the MQSeries queue.

The consumer keeps working (traces show it's alive) and the queue keeps receiving messages but the consumer is like a zombie, and doesn't consume any message.

When doing tests, we had no problems detecting disconnections or the queue being shut down, and it keeps trying to reconnect until the queue is up again.

Because of this problem, we wanted to try a different and more robust approach:
- Polling continuously for messages, and disconnecting and reconnecting if we end the timeout without receiving any message.
- Keeping the listener approach doing a ping to the queue every 'x' minutes. This would guarantee that the queue is up, but wouldn't guarantee that we keep receiving the events.

What are your expert recommendations to solve this polling problem? I don't trust the event listener and want a secondary, backup to test if my connection is OK.

That's what the exception listener is for. You open a queue and set a message listener on it. Set at the same time an exception listener on the connection. The exception listener should fire in the event of a disconnection... You may have to reduce your TCP/IP timeout from the default 2 hours to something like 5 mins though to detect problems faster...

Have fun
_________________
MQ & Broker admin
Back to top
View user's profile Send private message Send e-mail
ptolomeoo
PostPosted: Fri Mar 31, 2017 2:45 am    Post subject: Reply with quote

Newbie

Joined: 31 Mar 2017
Posts: 3

fjb_saper wrote:
ptolomeoo wrote:
Hello, I'm seeking help on this issue.

I have a consumer (based on listener) that eventually stops receiving events from the MQSeries queue.

The consumer keeps working (traces show it's alive) and the queue keeps receiving messages but the consumer is like a zombie, and doesn't consume any message.

When doing tests, we had no problems detecting disconnections or the queue being shut down, and it keeps trying to reconnect until the queue is up again.

Because of this problem, we wanted to try a different and more robust approach:
- Polling continuously for messages, and disconnecting and reconnecting if we end the timeout without receiving any message.
- Keeping the listener approach doing a ping to the queue every 'x' minutes. This would guarantee that the queue is up, but wouldn't guarantee that we keep receiving the events.

What are your expert recommendations to solve this polling problem? I don't trust the event listener and want a secondary, backup to test if my connection is OK.

That's what the exception listener is for. You open a queue and set a message listener on it. Set at the same time an exception listener on the connection. The exception listener should fire in the event of a disconnection... You may have to reduce your TCP/IP timeout from the default 2 hours to something like 5 mins though to detect problems faster...

Have fun


Thank you very much Sir, for the fast and accurate response.

Actually it makes sense that the timeout problem would arise after 2 hours but as we detect the problem earlier (if the number of messages in the queue only increases, it triggers an alarm), we thought we were not receiving the Exception events properly.

I will do some testing trying to reduce the default TCP/IP timeout to 5 minutes to see if this solves our problems.
Back to top
View user's profile Send private message
ptolomeoo
PostPosted: Sun Apr 02, 2017 10:05 pm    Post subject: How to properly reduce the TCP timeout in a MQ Connection? Reply with quote

Newbie

Joined: 31 Mar 2017
Posts: 3

Setting MQQueueConnectionFactory methods:
setClientReconnectTimeout(seconds)
and
setStatusRefreshInterval(milliseconds)

would be enough to reduce the TCP timeout?

Is there any other recommended way to do it?

TIA.
Back to top
View user's profile Send private message
fjb_saper
PostPosted: Mon Apr 03, 2017 4:20 am    Post subject: Re: How to properly reduce the TCP timeout in a MQ Connectio Reply with quote

Grand High Poobah

Joined: 18 Nov 2003
Posts: 20695
Location: LI,NY

ptolomeoo wrote:
Setting MQQueueConnectionFactory methods:
setClientReconnectTimeout(seconds)
and
setStatusRefreshInterval(milliseconds)

would be enough to reduce the TCP timeout?

Is there any other recommended way to do it?

TIA.

The TCP/IP timeout is set at the OS level in the TCP/IP stack. The default usually is around 2 hours...
_________________
MQ & Broker admin
Back to top
View user's profile Send private message Send e-mail
Display posts from previous:   
Post new topic  Reply to topic Page 1 of 1

MQSeries.net Forum Index » IBM MQ Java / JMS » Connection problems
Jump to:  



You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
Protected by Anti-Spam ACP
 
 


Theme by Dustin Baccetti
Powered by phpBB © 2001, 2002 phpBB Group

Copyright © MQSeries.net. All rights reserved.