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| Client channel problem |
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| p.cradwick |
 Posted: Thu Jan 22, 2009 4:58 pm Post subject: Client channel problem |
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Acolyte
Joined: 16 May 2001
Posts: 56
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Hi,
I have a customer who has some flaky networks between servers and wanted to replace an existing ftp network that moved files around.
This customer, driven by $s and against our advice, rejected a solution using an MQServer network and insisted
(on learning that clients were free) on using one MQServer Hub (i.e. QM) and using client connections for all spoke servers.
So the networks is a central MQ server v6.0 on Windows 2003 and the spokes (about 60 odd) are an assortment of
AIX, Windows (2000 & 2003), Solaris.
There is a Java client app using Java API classes (not JMS) and running on all spokes and on the Hub, that moves files as messages.
All spokes use separate SRVCONN channels to the Hub.
This app automatically reconnects when it notices that a connection is down. When this happens it can't do a clean disconnect, however
as all existing handles become invalid. The problem we are seeing is that the QM exceeds its max channels parameter (currently at 1000)
when there is a lot of network disruptions.
Is there a way of forcing the QM to release invalid connection handles?
Peter |
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| fjb_saper |
| Posted: Thu Jan 22, 2009 8:32 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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have you looked as dis conn(*) and stop conn(connumber) ? 
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MQ & Broker admin |
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| PeterPotkay |
| Posted: Thu Jan 22, 2009 9:40 pm Post subject: |
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Poobah
Joined: 15 May 2001
Posts: 7722
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On the MQ server, make sure TCP Keep Alive is turned on at the O/S level, probably knock down the time from the default of 2 hours (we use 15 minutes) and then tell the QM to use TCP Keep Alive.
When ever the MQ server notices that it has an orphaned TCP/IP connection to the QM, after Keep Alive Interval passes, it will kill the connection. The QM will log the fact the channel ended unexpectedly due to that, but it was a useless connection at that point anyway.
_________________
Peter Potkay
Keep Calm and MQ On |
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| p.cradwick |
| Posted: Thu Jan 22, 2009 11:20 pm Post subject: |
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Acolyte
Joined: 16 May 2001
Posts: 56
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Thanks guys, I will look into both suggestions
Peter |
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