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| Inquire head scratcher |
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| RogerLacroix |
 Posted: Wed Mar 03, 2010 11:09 am Post subject: Inquire head scratcher |
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Jedi Knight
Joined: 15 May 2001
Posts: 3264
Location: London, ON Canada
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All,
I've created an API Exit to do some testing. I'm running it on WMQ v6.0.2.7 on WinXP.
I'm scratching my head over data being passed on the API Exit's Inquire interface. Note: I've registered both the MQXR_BEFORE and MQXR_AFTER for the MQXF_INQ (Inquire Interface).
Every 20 seconds, the command server issues an MQ Inquire command. The data the API Exit Inquire interface is receiving is:
SelectorCount=1
Selectors=13
IntAttrCount=1
IntAttrs=9000
CharAttrLength=0
CharAttrs=
At first, I thought the data was weird but from a discussion with Neil Casey, it appears to be correct. 13 is MQIA_MAX_MSG_LENGTH and 9000 is the maxmsgl of SYSTEM.ADMIN.COMMAND.QUEUE.
Can anyone (IBM included) explain why the command server is issuing an Inquire call every 20 seconds?
i.e. Here's the logfile of the API Exit:
| Code: |
18:14:50.250, ConnxBefore, ProcessId=05224, ThreadId=1, CC=0, RC=0, HConn=2090030248, QMgrName=MQWT2, ConnName=, UserId=rlacroix, CNO_Version=5, CNO_Options=MQCNO_SHARED_BINDING, CNO_ConnId=, PgmName=ebSphere MQ\bin\amqpcsea.exe, PgmType=MQXACT_EXTERNAL, Environment=MQXE_COMMAND_SERVER
18:14:50.265, ConnxAfter , ProcessId=05224, ThreadId=1, CC=0, RC=0, HConn=8807024, QMgrName=MQWT2, ConnName=, UserId=rlacroix, CNO_Version=5, CNO_Options=MQCNO_SHARED_BINDING, CNO_ConnId=414D51434D5157543220202020202020EA9B8D4B20000601, PgmName=ebSphere MQ\bin\amqpcsea.exe, PgmType=MQXACT_EXTERNAL, Environment=MQXE_COMMAND_SERVER
18:14:50.265, OpenBefore , ProcessId=05224, ThreadId=1, CC=0, RC=0, HConn=8807024, HObj=1323464, ObjectQMgrName=, ObjectName=SYSTEM.ADMIN.COMMAND.QUEUE, ObjectType=MQOT_Q, Options=MQOO_INPUT_EXCLUSIVE+MQOO_INQUIRE+MQOO_BIND_AS_Q_DEF+MQOO_SAVE_ALL_CONTEXT, DynamicQName=AMQ.*, AlternateUserId=, AlternateSecurityId=, ResolvedQMgrName=, ResolvedQName=
18:14:50.265, OpenAfter , ProcessId=05224, ThreadId=1, CC=0, RC=0, HConn=8807024, HObj=25536856, ObjectQMgrName=, ObjectName=SYSTEM.ADMIN.COMMAND.QUEUE, ObjectType=MQOT_Q, Options=MQOO_INPUT_EXCLUSIVE+MQOO_INQUIRE+MQOO_BIND_AS_Q_DEF+MQOO_SAVE_ALL_CONTEXT, DynamicQName=AMQ.*, AlternateUserId=, AlternateSecurityId=, ResolvedQMgrName=MQWT2, ResolvedQName=SYSTEM.ADMIN.COMMAND.QUEUE
18:14:50.265, InqBefore , ProcessId=05224, ThreadId=1, CC=0, RC=0, HConn=8807024, HObj=25536856, SelectorCount=1, Selectors=13, IntAttrCount=1, IntAttrs=1310720, CharAttrLength=0, CharAttrs=
18:14:50.265, InqAfter , ProcessId=05224, ThreadId=1, CC=0, RC=0, HConn=8807024, HObj=25536856, SelectorCount=1, Selectors=13, IntAttrCount=1, IntAttrs=9000, CharAttrLength=0, CharAttrs=
18:14:50.265, InqBefore , ProcessId=05224, ThreadId=1, CC=0, RC=0, HConn=8807024, HObj=25536856, SelectorCount=1, Selectors=13, IntAttrCount=1, IntAttrs=9000, CharAttrLength=0, CharAttrs=
18:14:50.265, InqAfter , ProcessId=05224, ThreadId=1, CC=0, RC=0, HConn=8807024, HObj=25536856, SelectorCount=1, Selectors=13, IntAttrCount=1, IntAttrs=9000, CharAttrLength=0, CharAttrs=
18:15:10.265, InqBefore , ProcessId=05224, ThreadId=1, CC=0, RC=0, HConn=8807024, HObj=25536856, SelectorCount=1, Selectors=13, IntAttrCount=1, IntAttrs=9000, CharAttrLength=0, CharAttrs=
18:15:10.265, InqAfter , ProcessId=05224, ThreadId=1, CC=0, RC=0, HConn=8807024, HObj=25536856, SelectorCount=1, Selectors=13, IntAttrCount=1, IntAttrs=9000, CharAttrLength=0, CharAttrs=
18:15:30.265, InqBefore , ProcessId=05224, ThreadId=1, CC=0, RC=0, HConn=8807024, HObj=25536856, SelectorCount=1, Selectors=13, IntAttrCount=1, IntAttrs=9000, CharAttrLength=0, CharAttrs=
18:15:30.265, InqAfter , ProcessId=05224, ThreadId=1, CC=0, RC=0, HConn=8807024, HObj=25536856, SelectorCount=1, Selectors=13, IntAttrCount=1, IntAttrs=9000, CharAttrLength=0, CharAttrs=
18:15:50.265, InqBefore , ProcessId=05224, ThreadId=1, CC=0, RC=0, HConn=8807024, HObj=25536856, SelectorCount=1, Selectors=13, IntAttrCount=1, IntAttrs=9000, CharAttrLength=0, CharAttrs=
18:15:50.265, InqAfter , ProcessId=05224, ThreadId=1, CC=0, RC=0, HConn=8807024, HObj=25536856, SelectorCount=1, Selectors=13, IntAttrCount=1, IntAttrs=9000, CharAttrLength=0, CharAttrs=
18:16:10.265, InqBefore , ProcessId=05224, ThreadId=1, CC=0, RC=0, HConn=8807024, HObj=25536856, SelectorCount=1, Selectors=13, IntAttrCount=1, IntAttrs=9000, CharAttrLength=0, CharAttrs= |
The log repeats the Inquire every 20 seconds until I stop the queue manager.
Does anyone, including IBM, want to explain what I am seeing?
Regards,
Roger Lacroix
Capitalware Inc.
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| fjb_saper |
| Posted: Sun Mar 28, 2010 5:34 am Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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Roger,
Could it be that the command server is polling its queue every 20 seconds to check if there is work to be done? Let's say a loop with MQGET wait(20 seconds)? 
What happens if you stop the command server but leave the qmgr running?
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| RogerLacroix |
| Posted: Thu Apr 01, 2010 3:00 pm Post subject: |
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Jedi Knight
Joined: 15 May 2001
Posts: 3264
Location: London, ON Canada
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Hi,
The response from someone at IBM was:
| Quote: |
I've had a look at the code, and basically it looks to be trying to ensure that:
(a) its message buffer is likely to be big enough for the command messages on the queue; and
(b) if it can't allocate enough storage it can tell you about it reasonably close to the point in time at which you changed MAXMSGLEN.
I presume it's written that way because there was much less memory in the average computer in 1992. |
Regards,
Roger Lacroix
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