| Author |
Message |
 Topic: Message loss with failover in MQ V7 Cluster |
Wally
Replies: 38
Views: 20491
|
 Forum: Clustering Posted: Fri Sep 24, 2010 3:47 am Subject: Message loss with failover in MQ V7 Cluster |
| Ok, after getting all the Hint & Tips from you I started some more test on it. Still I can see/discover my message which should have been sent out the the off-line qmgr - any commands issued on an ... |
| Topic: Message loss with failover in MQ V7 Cluster |
Wally
Replies: 38
Views: 20491
|
Forum: Clustering Posted: Wed Sep 22, 2010 10:05 pm Subject: Message loss with failover in MQ V7 Cluster |
In some, but not all of your narrative, you say "Check status > S1: SCTQ empty"
Empty means no message is the queue when browsing with MQ Explorer.
I'm thinking that it's your a ... |
| Topic: Message loss with failover in MQ V7 Cluster |
Wally
Replies: 38
Views: 20491
|
Forum: Clustering Posted: Wed Sep 22, 2010 9:48 pm Subject: Message loss with failover in MQ V7 Cluster |
has not run its state synch process a message could be lost.
For the record, which process is this? I've never heard of it. All I know about is the workload balancer, which doesn't hold state that ... |
| Topic: Message loss with failover in MQ V7 Cluster |
Wally
Replies: 38
Views: 20491
|
Forum: Clustering Posted: Wed Sep 22, 2010 8:41 am Subject: Message loss with failover in MQ V7 Cluster |
I have checked again: seems the message only get lost in a situation where previous messages have been distributed across my two target qmgrs and then shutting them down.
Are you saying that you loo ... |
| Topic: Message loss with failover in MQ V7 Cluster |
Wally
Replies: 38
Views: 20491
|
Forum: Clustering Posted: Wed Sep 22, 2010 8:28 am Subject: Message loss with failover in MQ V7 Cluster |
Is this a new application?
Let's do a simple test.
1. Stop the clussdr channel on the qmgr where you run the application.
2. Any messages in the SCTQ?
3. Run the application putting exactly 3 ... |
| Topic: Message loss with failover in MQ V7 Cluster |
Wally
Replies: 38
Views: 20491
|
Forum: Clustering Posted: Wed Sep 22, 2010 8:15 am Subject: Message loss with failover in MQ V7 Cluster |
I just discovered another strange thing: when i stop both T1 and T2 and try send 4 messages via S1 only 3 are kept in the SCTQ and again the first message is lost - how strange is this ??
Which 3?
... |
| Topic: Message loss with failover in MQ V7 Cluster |
Wally
Replies: 38
Views: 20491
|
Forum: Clustering Posted: Wed Sep 22, 2010 7:41 am Subject: Message loss with failover in MQ V7 Cluster |
the message should stay in the S.C.T.Q - no ??
Yes, presuming that a message was created AND the message didn't expire OR end up in a dead-letter queue.
MQ doesn't lose messages.
I thought this ... |
| Topic: Message loss with failover in MQ V7 Cluster |
Wally
Replies: 38
Views: 20491
|
Forum: Clustering Posted: Wed Sep 22, 2010 7:38 am Subject: Message loss with failover in MQ V7 Cluster |
How do you mean "targeted"? If a message is addressed to a given queue manager it bypasses the cluster workload distribution.
I mean targeted in sence of round-robin would try to send ... |
| Topic: Message loss with failover in MQ V7 Cluster |
Wally
Replies: 38
Views: 20491
|
Forum: Clustering Posted: Wed Sep 22, 2010 7:24 am Subject: Message loss with failover in MQ V7 Cluster |
Now I am lost - just waited 5 minutes before sending messages and all messages arrived at the on-line qmgr - no loss !?!?
Ok, if MQ is not recognizing the channel failure in time at least the messa ... |
| Topic: Message loss with failover in MQ V7 Cluster |
Wally
Replies: 38
Views: 20491
|
Forum: Clustering Posted: Wed Sep 22, 2010 6:57 am Subject: Message loss with failover in MQ V7 Cluster |
How long a time? It will take a discussed and documented period for the channels to notice the failure.
I wait like 30 seconds, but at least the time until the Explorer come back with the messa ... |
| Topic: Message loss with failover in MQ V7 Cluster |
Wally
Replies: 38
Views: 20491
|
Forum: Clustering Posted: Wed Sep 22, 2010 6:41 am Subject: Message loss with failover in MQ V7 Cluster |
First, queues are neither persistent nor non-persistent - messages are.
Is the SCTQ really named S1.SYSTEM.CLUSTER.TRANSMIT.QUEUE?
What queue does your application open?
Sorry for the con ... |
| Topic: Message loss with failover in MQ V7 Cluster |
Wally
Replies: 38
Views: 20491
|
Forum: Clustering Posted: Wed Sep 22, 2010 6:33 am Subject: Message loss with failover in MQ V7 Cluster |
So when I run the "failover test" I stop the complete qmgr T1; wait a time and then again try to send messages.
Changing the System.Cluster.Transmit.Queue to persistant does help either.
... |
| Topic: Message loss with failover in MQ V7 Cluster |
Wally
Replies: 38
Views: 20491
|
Forum: Clustering Posted: Wed Sep 22, 2010 6:17 am Subject: Message loss with failover in MQ V7 Cluster |
| So I had a look into the S1.SYSTEM.CLUSTER.TRANSMIT.QUEUE, but saying this it looks like this is by default non-persistant - will modify this to persistant and run my test again. The message should be ... |
| Topic: Message loss with failover in MQ V7 Cluster |
Wally
Replies: 38
Views: 20491
|
Forum: Clustering Posted: Wed Sep 22, 2010 6:01 am Subject: Re: Message loss with failover in MQ V7 Cluster |
I'd expect the message to be in the SCTQ rather than lost. Does the message have expiry set?
It should work within limits. There have been a number of discussions on using a WMQ cluster for this ... |
| Topic: Message loss with failover in MQ V7 Cluster |
Wally
Replies: 38
Views: 20491
|
Forum: Clustering Posted: Wed Sep 22, 2010 5:19 am Subject: Message loss with failover in MQ V7 Cluster |
Hello out there,
- I do run a small test MQ v7 cluster on a single Windows box
- I have 3 QMGRs named T1, T2 and S1 listening on ports 1501, 1502 and 1503
- T1 and T2 are ... |
