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| Messages Eaten up on the way ! |
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| bruce2359 |
 Posted: Tue Sep 28, 2010 12:42 pm Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9475
Location: US: west coast, almost. Otherwise, enroute.
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| Quote: |
| If the messages are not persistent and there is a problem with the channel (as evidenced by the Retry state) the channel agent will end up discarding the non persistent messages in flight. |
Where did this come from? It was in blue a few replies back. And, it is not correct.
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| fjb_saper |
| Posted: Tue Sep 28, 2010 8:08 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20763
Location: LI,NY
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| bruce2359 wrote: |
| Quote: |
| If the messages are not persistent and there is a problem with the channel (as evidenced by the Retry state) the channel agent will end up discarding the non persistent messages in flight. |
Where did this come from? It was in blue a few replies back. And, it is not correct. |
Sorry I should have said, may end up discarding...
I did not specify the value of NPMSPEED.  
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| bruce2359 |
| Posted: Tue Sep 28, 2010 8:19 pm Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9475
Location: US: west coast, almost. Otherwise, enroute.
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I don't believe that RETRY status is sufficient for non-persistent messages to be discarded on an npmspeed(fast) channel.
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Lex Orandi, Lex Credendi, Lex Vivendi. As we Worship, So we Believe, So we Live. |
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| fjb_saper |
| Posted: Wed Sep 29, 2010 12:09 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
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Location: LI,NY
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| bruce2359 wrote: |
| I don't believe that RETRY status is sufficient for non-persistent messages to be discarded on an npmspeed(fast) channel. |
Depends on a number of other factors including but not limited to message expiry.
However the fact that his channel status seems to recover to running state after a little while, without any messages appearing at the destination, let me to speculate that the messages were indeed discarded by the channel agent.
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| bruce2359 |
| Posted: Wed Sep 29, 2010 12:19 pm Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9475
Location: US: west coast, almost. Otherwise, enroute.
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At the receiving end of an npmspeed(fast) channel, the MCA will discard a message if:
1) the message is non-persistent, AND
2) the destination queue does not exist, or is put-inhibited, or is full, or msg is too big for the queue; AND
2) the dead-letter queue does not exist, or is put-inhibited, or is full, or msg is too big for the queue
A channel being in RETRY indicates that the channel is not RUNNING; and thus, is not transmitting messages; and therefore the above rules do not apply.
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Lex Orandi, Lex Credendi, Lex Vivendi. As we Worship, So we Believe, So we Live. |
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| fjb_saper |
| Posted: Wed Sep 29, 2010 12:31 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20763
Location: LI,NY
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| bruce2359 wrote: |
At the receiving end of an npmspeed(fast) channel, the MCA will discard a message if:
1) the message is non-persistent, AND
2) the destination queue does not exist, or is put-inhibited, or is full, or msg is too big for the queue; AND
2) the dead-letter queue does not exist, or is put-inhibited, or is full, or msg is too big for the queue
A channel being in RETRY indicates that the channel is not RUNNING; and thus, is not transmitting messages; and therefore the above rules do not apply. |
And would not the destination queue full without a DLQ qualify with putting the channel into retry a few times before discarding the message (retry options)? Agreed that a retry mode alone does not allow for communications. However a retry status moving to a running status without the messages being delivered is always grounds for investigation....
I have even seen the weird thing where a sequence error on a cluster channel allowed the non persistent messages to be routed to the qmgr albeit at a much slower rate than usual... and no the channel was not in doubt...
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| bruce2359 |
| Posted: Wed Sep 29, 2010 2:51 pm Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9475
Location: US: west coast, almost. Otherwise, enroute.
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| Quote: |
| And would not the destination queue full without a DLQ qualify with putting the channel into retry a few times before discarding the message (retry options)? |
Non-persistent messages on NPMSPEED(FAST) will cause the MCA to discard non-persistent messages if the conditions (above) are met. Retries will be attempted.
Persistent messages will not be discarded. Persistent messages are sent in UofWs. If all retries fail, the UofW is incomplete, and the channel is IN-DOUBT.
[edit]
A good reference for In-doubt channels is http://publib.boulder.ibm.com/infocenter/wmqv6/v6r0/index.jsp?topic=/com.ibm.mq.csqzae.doc/ic11350_.htm
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