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| Shine S. |
 Posted: Thu May 23, 2002 4:47 am Post subject: MQGET tooo tired... |
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Newbie
Joined: 23 May 2002
Posts: 9
Location: Mumbai, India
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hi...
i'm facing a strange problem with my mqget method... it is waiting for the message indefinitely even if message comes to the queue. ive tried setting wait interval with different values.. but after a long stretch of waiting for messages.... it sleeps! 
please help me get my MQ back to normal..
Shine
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| mqonnet |
| Posted: Thu May 23, 2002 5:01 am Post subject: |
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Grand Master
Joined: 18 Feb 2002
Posts: 1114
Location: Boston, Ma, Usa.
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Check to see if you have any specific Get options. If so try with defaults.
Also are you initializing/reinitializing the MD which you are using on a Get. If not, then the values in the md are from the first get and which cause all hinderences. Because the next get thinks that it needs to search/look for the specific message with the msgid/correlid of the previous message.
Also please either post the piece of Get logic code here, or post at least your md and get options, if the above does not resolve your prblm.
Cheers.
Kumar
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| Shine S. |
| Posted: Thu May 23, 2002 5:05 am Post subject: |
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Newbie
Joined: 23 May 2002
Posts: 9
Location: Mumbai, India
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thank u sooo much kumar for ur quick reply.. i'll try doing what u said..
infact i'm not resetting any of the mqheaders for subsequent MQGETs..
thanx again
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| Shine S. |
| Posted: Thu May 23, 2002 5:12 am Post subject: More of the options... |
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Newbie
Joined: 23 May 2002
Posts: 9
Location: Mumbai, India
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hi..
i'm setting the MQMD with MQMD_DEFAULT
and the Options for Get are
MQGMO_WAIT + MQGMO_CONVERT + MQGMO_SYNCPOINT
plz help me..
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| oz1ccg |
| Posted: Thu May 23, 2002 5:16 am Post subject: |
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Yatiri
Joined: 10 Feb 2002
Posts: 628
Location: Denmark
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What is the value of WaitInterval in MQGMO, is it zero ? or -1
if -1 -> unlimited wait... 
we don't want more waitingtime don't we ?
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| mqonnet |
| Posted: Thu May 23, 2002 5:17 am Post subject: |
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Grand Master
Joined: 18 Feb 2002
Posts: 1114
Location: Boston, Ma, Usa.
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As you already pointed you, you need to REINITIALIZE the Md, before you call mqget for the second time. Else the first Get's msgid is taken as key and all the subsequent mqget's search for a msg with this msgid, which will never come. Since you already got one. Hence the key here is reinitializing.
Cheers.
Kumar
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| Shine S. |
| Posted: Thu May 23, 2002 5:26 am Post subject: Itz initialised... |
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Newbie
Joined: 23 May 2002
Posts: 9
Location: Mumbai, India
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hi again..
The mqmd structure is reinitialised for each call using the MQMD_DEFAULT assignment. is this initialisation enough?? or any other initialisation is necessary???
and ive given wait interval as 60000 not -1.
thanx.. Shine
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| mqonnet |
| Posted: Thu May 23, 2002 5:36 am Post subject: |
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Grand Master
Joined: 18 Feb 2002
Posts: 1114
Location: Boston, Ma, Usa.
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Is this getting app also doing the puts. Are you using Syncpointing.
Is it possible that the messages that arrive on queue(what you think), might actually not have been committed yet, by the other app which is doin the put. If this is the same app doing the put too, then are you committing the messages. Until and unless the messages are committed by the sending app, this app(getting app) cannot retrieve them. Check the same.
And if this still does not resolve the prob, could you please post your Get code in here.
Cheers.
Kumar
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| Shine S. |
| Posted: Thu May 23, 2002 6:03 am Post subject: Flow.. |
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Newbie
Joined: 23 May 2002
Posts: 9
Location: Mumbai, India
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i'm using syncpoint but the putting application is actually committing the messages. when i check the queu depth itz showing messages but the application is waiting(still) for messages.
the flow of code is like this..
MQCONN
MQBEGIN
do
initialise MQMD structure and Options
MQGET with SyncPoint
while NO_MSG_AVAILABLE
...........
...........
Commit or Rollback
Ive tried setting different wait intervals.. but in the long run ( a few hours ) the application sleeps indefinitely..
is there any remedy for it...
i tried attaching the sleeping process in gdb and it showed the following piece of information
#0 xxxx in _select_sys () from /usr/lib/libc.2
#1 xxxx in select () from /usr/lib/libc.2
#2 xxxx in cma_select () from /opt/mqm/lib/libmqmcs.sl
#3 xxxx in xllListenSelectAcceptAndClose () from /opt/mqm/lib.libmqmcs.sl
#4 xxxx in xllWaitSocketEvent () from /opt/mqm/lib.libmqmcs.sl
.... any idea... what might've happened
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| mqonnet |
| Posted: Thu May 23, 2002 6:21 am Post subject: |
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Grand Master
Joined: 18 Feb 2002
Posts: 1114
Location: Boston, Ma, Usa.
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Try running amqsbcg to check if the messages on the queue are actually committed, may be after this program ends. Just looking at the curdepth go raising does not mean that the messages are actually ready to be retrieved. Until they are committed, they cannot be retrieved. Hence, to clarify this, you could run amqsbcg to see if you are able to browse all the messages off the queue.
Cheers.
Kumar
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| Shine S. |
| Posted: Thu May 23, 2002 6:29 am Post subject: Committed ? |
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Newbie
Joined: 23 May 2002
Posts: 9
Location: Mumbai, India
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.. and one more thing..
the same application ( which was refusing to read the message ) reads the queue once it is brought down!
that means, when i bring it down and bring it up again.. it reads ( huh! )
c ya soon..
Shine
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