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| Single Queue, Multiple processes reading |
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| Rclements |
 Posted: Thu Oct 03, 2002 9:45 am Post subject: Single Queue, Multiple processes reading |
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Novice
Joined: 20 Jun 2002
Posts: 18
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I have a single queue. and I want to launch a number of java programs which each read a message from the queue, do some stuff and repeat.
When I try this, only the first two java readers seem able to get messages form the queue. Any other java reads seem incapable of getting message from the queue.
I am assuming that this a configuration issue with MQ, or the Java APIs
any suggestions?
ricardo |
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| viraj |
| Posted: Fri Oct 04, 2002 2:40 am Post subject: |
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Newbie
Joined: 03 Oct 2002
Posts: 9
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Hi Ricardo,
I tried this. I had set up 3 MDB's listening on the same queue. When I send a message to queue only one MDB was picking up the message and the remaining MDB's seem to be idle. But When I started sending multiple messages (USING FOR LOOP IN THE SENDER PROGRAM) I found all the 3 mdbs were picking up the messages.
So try to increase the number of messages u send to the queue simultaneously. Then u will see all of ur programs receiving messages.
This is because if the listening program is busy processing a message, then the second listening program is activated. So JMS decides this triggerring based on some internal algorithm.
_________________
Regards
Raj |
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| Rclements |
| Posted: Mon Oct 07, 2002 7:05 pm Post subject: Single Queue, Multiple Readers |
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Novice
Joined: 20 Jun 2002
Posts: 18
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Here is the test sequence I go through.
1. Load Queue A with 900 messages (approx 10 chars in length)
2. Start Reader program #1 using blocking reads on Queue B
3. Start Reader program #2 using blocking reads on Queue B
4. Start Reader program #3 using blocking reads on Queue B
5. Start a program which reads Queue A and copyies msg to Queue B, and repeats till queue A is empty.
This was an attempt to have the reader programs all start near the same time.
Results:
Reader Program 1 read 420 or so messages
Reader Program 2 read 480 or so messages
Reader program 3 read 0 messages
I did try starting more than 3 reader programs and any additional reader programs that might be running also read 0 messages.
??
ricardo |
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