CMDTUX_CAT:1380: ERROR: Message queue blocking prevented delivery

Today, I changed a Tuxedo application (server) to the product systems(One master and two slaves). Only a small changes in code. But after a period of running, there are many errors in ULOG:
CMDTUX_CAT:1380: ERROR: Message queue blocking prevented delivery, Qaddr = 583902
And then, the server is died. After restart the server, this will happen again later.
I don't know why this happens? Thx.

Hi Bill,
This is happening because the BRIDGE process received a message from the network and was unable to place the message on the intended IPC queue. This could be because the server handling that message is backed up, or the system IPC resource settings are too low. Please check the recommended actions in:
http://download.oracle.com/docs/cd/E18050_01/tuxedo/docs11gr1/messages/cdtux/cdtux013.html
Regards,
Todd Little
Oracle Tuxedo Chief Architect

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Message Queue Blocking / MSGMNI Setting

Hi All,
Firstly, many thanks to all that can assists. I am currently getting Message Queue
Blocking messages in my ULOG files in my Tuxedo Application. (Tux ver 7.1 in Unix).
I am not sure what is causing this, but started to look into the Tux Config (UBB.MP)
and System message queue setting. Detailed as follows:
1)
Listed below is the system message queue setting:
set msgsys:msginfo_msgmni=2000
set msgsys:msginfo_msgmax=128000
set msgsys:msginfo_msgmnb=100000
set msgsys:msginfo_msgssz=256
set msgsys:msginfo_msgseg=25088
set msgsys:msginfo_msgtql=1550
set msgsys:msginfo_msgmap=1000
According to the BEA site, the MSGMNI is determined by this formula:
MSGMNI = MAXACCESSERS + 7 + (no. of servers with REPLYQ) + (no. MSSQ sets) - (no.
of servers with MSSQ sets)
The following is my current Tux. Config (UBB.MP) is set as :
- MAXACCESSERS = 2300
- Each servers (4 types in total) has its own REPLYQ and RQADDR.
- The same type of servers are set the same across 4 application servers.
Hence, my MSGMNI should be a minimum 2339 (ie. MSGMNI = 2300 + 16 + 16 - 0 = 2339).
But my current MSGMNI is 2000.
Would this contribute to my Message Queue Blocking?
Is my understanding correct and is this something I should change to avoid Message
Queue Blocking? Any helps and advice is much appreciated.

Malcolm,
Your information and explanations behind these error messages are very useful.
It allow me to further understand Tuxedo internal processing and at the same time
give me a chance to start analysing these fields.
I am reluctant to ask further questions at the mean time. I will use your suggestions
as a starting point.
I will certainly keep you posted of the outcome when I have made the changes in
my UBB config and machine parameters.
Many thanks with your help/explanations Malcolm. It helps alot!
Cheers.
David.
"Malcolm Freeman" <[email protected]> wrote:
>
Hi David,
The MSGTQL reference you give (Solution S-00488) refers to the BEA MessageQ
product
and is not relevant to Tuxedo.
The error messages indicate that the queue buildup is probably due to
a restartable
server failing. What happens is this:
When a restartable server fails its IPC queue remains in place and continues
to
receive messages (which will be processed when the server restarts).
Depending
on the time taken to restart, the queue could become full and unable
to receive
any more messages, and this is probably why you got the message CMDTUX_CAT:1380
indicating that the BRIDGE process was unable to put a message on the
server's
queue.
A server is only restarted when the BBL does a SANITYSCAN check. If,
for example,
your SANITYSCAN interval is 300 seconds and your server fails immediately
after
the previous scan, then there will be a delay of almost 5 minutes before
the failure
is detected and the server restarted - plenty of time for the queue to
fill up.
There are a few things you could do:
The key thing would be to find out why the server is failing, and fix
the problem.
If this is not possible immediately, consider some of the other ideas
below.
Have several servers form an MSSQ to service this queue; then if one
fails the
others will continue processing the messages while the failed server
restarts
(this assumes, of course, that your application does not require the
messages
to be processed in strict order through the server).
Reduce the SANITYSCAN interval (but don't make it too small). This would
reduce
the average time taken to restart the server.
Increase the size of the IPC queue (MSGMNB) so that it can hold more
messages.
I'm not sure why you got a LIBTUX_CAT:1485 message, but this could be
due to a
BRIDGE failure as a result of the congestion.
The NETLOAD parameter would reduce the number of messages going to the
remote
machine, but only if the local machine offers the same service. If the
remote
machine is the only source of the service then NETLOAD will have no effect.
I
recommend you do a search of this newsgroup for postings on "load balancing"
there's some good stuff which will explain how load balancing works.
Depending how things go, it might not be a bad idea to open a case with
BEA Support
and ask for guidance (remember to submit your ubbconfig (or preferably
do a tmunloadcf)
together with the complete ULOGs from both the master and the slave machine).
Hope this helps some.
Regards,
Malcolm.
"Dave" <[email protected]> wrote:
Hi Malcolm,
Thank you for your reply. Interesting point you have made about theMSGTQL
value.
Based on your suggestion I went hunting around the BEA site and found
the following
snipplet:
"- The MSGTQL parameter must be set to a value greater than or
equal to the MSGMNI setting."
(http://support.bea.com/application?namespace=askbea&origin=ask_bea_answer.jsp&event=link.view_answer_page_solution&answerpage=solution&page=msq/S-00488.htm)
If the above point is valid, then my MSGTQL is definitely way too low.
IF this
be the case, would you know of a method to work out what my MSGTQL bytes
value
should be?
Additionally, I have looked at other parameters which I could tune,and
would
adding a NETLOAD parameter in the *MACHINES section will reduce remote
servers
call? Which potentially, maybe reduce message queue blocking?
FYI:
The error messages I am seeing in my ULOG file are:
"LIBTUX_CAT: 1477 : ERROR .SysServerDied
LIBTUX_CAT: 1476 : ERROR: .SysServerRestarting"
Which then leads to message queue blocking
"CMDTUX_CAT: 1380 : ERROR: Message queue blocking prevented delivery,
Qaddr=..."
and potentially "LIBTUX_CAT: 1485 .SysNetworkDropped."
Many Thanks. Hope to hear from you (Malcolm) or other parties out there
that can
assists.
Thanks.
David

.SysMachineMsgq: message queue blocking

Hi,
I am getting the following error message:
064222.hostname!TMSYSEVT.14351.3071440608.0: WARN: .SysMachineMsgq: hostname message queue blocking
Is there anyway to pinpoint exactly which application and or which service is causing the blocking?
Thank you,
Ivan

Ivan,
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failed because the message queue or the system is full" message. That will
tell you the process in which the msgsnd() failed, although it will not tell
you the specific queue that was full. If the queue full condition is not
something transient, you can use the "ipcs -q -a" command to examine the
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If you need to automate the process of searching the ULOG, the T_ULOG class
in TM_MIB(5) can be used.
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might be a problem with sending a large message to the TMSYSEVT server.
(There is a check to prevent looping if the message send to TMSYSEVT fails.)
Ed
<Ivan Novick> wrote in message news:[email protected]..
Hi,
I am getting the following error message:
064222.hostname!TMSYSEVT.14351.3071440608.0: WARN: .SysMachineMsgq:
hostname message queue blocking
Is there anyway to pinpoint exactly which application and or which service
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Thank you,
Ivan

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I want to display an error message in the selection screen. The error is for input date validation. But the once error displays in the status bar, it blocks the input fields in the selection screen. I want to display the error message without blocking any of the input parameter in the selection screen. Where should i write the code?
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Hi All,
Firstly, many thanks to all that can assists. I am currently getting Message Queue
Blocking messages in my ULOG files in my Tuxedo Application. (Tux ver 7.1 in Unix).
I am not sure what is causing this, but started to look into the Tux Config (UBB.MP)
and System message queue setting. Detailed as follows:
1)
Listed below is the system message queue setting:
set msgsys:msginfo_msgmni=2000
set msgsys:msginfo_msgmax=128000
set msgsys:msginfo_msgmnb=100000
set msgsys:msginfo_msgssz=256
set msgsys:msginfo_msgseg=25088
set msgsys:msginfo_msgtql=1550
set msgsys:msginfo_msgmap=1000
According to the BEA site, the MSGMNI is determined by this formula:
MSGMNI = MAXACCESSERS + 7 + (no. of servers with REPLYQ) + (no. MSSQ sets) - (no.
of servers with MSSQ sets)
The following is my current Tux. Config (UBB.MP) is set as :
- MAXACCESSERS = 2300
- Each servers (4 types in total) has its own REPLYQ and RQADDR.
- The same type of servers are set the same across 4 application servers.
Hence, my MSGMNI should be a minimum 2339 (ie. MSGMNI = 2300 + 16 + 16 - 0 = 2339).
But my current MSGMNI is 2000.
Would this contribute to my Message Queue Blocking?
Is my understanding correct and is this something I should change to avoid Message
Queue Blocking? Any helps and advice is much appreciated.

Hi All,
Firstly, many thanks to all that can assists. I am currently getting Message Queue
Blocking messages in my ULOG files in my Tuxedo Application. (Tux ver 7.1 in Unix).
I am not sure what is causing this, but started to look into the Tux Config (UBB.MP)
and System message queue setting. Detailed as follows:
1)
Listed below is the system message queue setting:
set msgsys:msginfo_msgmni=2000
set msgsys:msginfo_msgmax=128000
set msgsys:msginfo_msgmnb=100000
set msgsys:msginfo_msgssz=256
set msgsys:msginfo_msgseg=25088
set msgsys:msginfo_msgtql=1550
set msgsys:msginfo_msgmap=1000
According to the BEA site, the MSGMNI is determined by this formula:
MSGMNI = MAXACCESSERS + 7 + (no. of servers with REPLYQ) + (no. MSSQ sets) - (no.
of servers with MSSQ sets)
The following is my current Tux. Config (UBB.MP) is set as :
- MAXACCESSERS = 2300
- Each servers (4 types in total) has its own REPLYQ and RQADDR.
- The same type of servers are set the same across 4 application servers.
Hence, my MSGMNI should be a minimum 2339 (ie. MSGMNI = 2300 + 16 + 16 - 0 = 2339).
But my current MSGMNI is 2000.
Would this contribute to my Message Queue Blocking?
Is my understanding correct and is this something I should change to avoid Message
Queue Blocking? Any helps and advice is much appreciated.

Change username to "last name" in error message for blocked order

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CMDTUX_CAT:1380: ERROR: Message queue blocking prevented delivery

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