PK93210: APPLICATION SERVER MAY HANG UNDER LOAD WHEN JOINING GLOBAL TRANSACTIONS AS A SUBORDINATE TO ANOTHER APPLICATION SERVER

Fixes are available

APAR status

Closed as program error.

Error description

A WebSphere Application Server for z/OS controller region may
hang when it is running near capacity and is joining global
transactions as a subordinate to another OTS compliant
application server.  This can occur when distributing EJBs
between two application servers, and the EJBs are configured to
participate in the same global transaction.

When viewing an SVC dump of the hung controller region, the
traceback of many of the controller region threads will show
com/ibm/ws390/tx/WorkRequestDispatcher.dispatch() at the bottom
of the stack, and
com/ibm/ws390/orb/ClientDelegate.invokeRequestCFW() at the top
of the stack.  An example stack trace is shown below:

com/ibm/ws390/orb/ClientDelegate.invokeRequestCFW
     ClientDelegate.java
com/ibm/ws390/orb/ClientDelegate.commonInvoke
     ClientDelegate.java:1016
com/ibm/ws390/orb/ClientDelegate.invoke
     ClientDelegate.java:863
org/omg/CORBA/portable/ObjectImpl._invoke
     ObjectImpl.java:484
.......
.......
com/ibm/ws390/tx/WorkRequestDispatcher.dispatchExit
     WorkRequestDispatcher.java:538
com/ibm/ws390/tx/WorkRequestDispatcher.dispatch
     WorkRequestDispatcher.java:108

Local fix

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server V7.0                                 *
****************************************************************
* PROBLEM DESCRIPTION: WebSphere Application Server for        *
*                      z/OS stops processing requests when     *
*                      running near capacity and when          *
*                      joining a global transaction with       *
*                      another OTS compliant application       *
*                      server.                                 *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
WebSphere Application Server for z/OS may stop processing
requests when the server is running near capacity and is also
joining global transactions originating from another OTS
compliant application server.  During the transaction join,
the controller region may use up all of its worker threads
communicating with the application server originating the
transaction.  This leaves no threads for the WebSphere
Application Server to use to process application requests.

Problem conclusion

Code was added to prevent transaction join processing from
using all of the controller region worker threads.

The following minor codes and abend codes were added to the
WebSphere Application Server for z/OS as a result of APAR
PK93210:

APAR PKPK93210 requires changes to documentation.

NOTE: Periodically, we refresh the documentation on our
Web site, so the changes might have been made before you
read this text. To access the latest on-line
documentation, go to the product library page at:

http://www.ibm.com/software/webservers/appserv/library

A change to the z/OS version of the WebSphere Application
Server Version 7.0 Information Center will be made to add
the following minor codes:

C9C21A9D
Explanation: IBM Internal Only
Suggested Action:  For support, look up problem determination
information on WebSphere Application Server eSupport page at:
http://www.ibm.com/software/webservers/appserv/zos_os390/support

C9C21A9E
Explanation: IBM Internal Only
Suggested Action:  For support, look up problem determination
information on WebSphere Application Server eSupport page at:
http://www.ibm.com/software/webservers/appserv/zos_os390/support

C9C21A9F
Explanation: IBM Internal Only
Suggested Action:  For support, look up problem determination
information on WebSphere Application Server eSupport page at:
http://www.ibm.com/software/webservers/appserv/zos_os390/support

A change to the z/OS version of the WebSphere Application
Server Version 7.0 Information Center will be made to add
the follwoing abend codes:
Abend Code: EC3
Abend Reason: 06110001
Explanation: A call to RRS service ATREINT5 or ATR4EINT
returned a UR_STATE_ERROR return code.  The context which
WebSphere was trying to express interest in is owned by the
servant region which is  being terminated with this abend
reason code.  The cause of the UR_STATE_ERROR is typically a
previous abend in this same servant region, which can cause
the context to end abnormally, or an abend in  another
resource manager which switched the context onto a task in its
address space using the CTXSWCH service.
Suggested Action: WebSphere terminates the servant region
owning the context with this abend and reason code.  Look for
previous abends and/or error messages in the job log for this
servant region, and in the job log for any resource managers
that this servant region connects to.  In most cases, the
UR_STATE_ERROR can be prevented by correcting the cause of the
initial abend and/or error condition.  For further assistance
look up problem determination information on WebSphere
Application Server eSupport page at:
http://www.ibm.com/software/webservers/appserv/zos_os390/support

APAR PK93210 is currently targeted for inclusion in
Service Level (Fix Pack) 7.0.0.7 of WebSphere
Application Server V7.0.

Please refer to URL:
//www.ibm.com/support/docview.wss?rs=404&uid=swg27006970
for Fix Pack availability.

Temporary fix

Comments

APAR Information

APAR number
PK93210
Reported component name
WEBSPHERE FOR Z
Reported component ID
5655I3500
Reported release
700
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2009-08-05
Closed date
2009-09-17
Last modified date
2009-12-02

APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:

Fix information

Fixed component name
WEBSPHERE FOR Z
Fixed component ID
5655I3500

Applicable component levels

R700 PSY UK51554
UP09/11/10 P F911

Fix is available

Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SS7K4U","label":"WebSphere Application Server for z\/OS"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"7.0","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
24 October 2021

Tips

PK93210: APPLICATION SERVER MAY HANG UNDER LOAD WHEN JOINING GLOBAL TRANSACTIONS AS A SUBORDINATE TO ANOTHER APPLICATION SERVER

Fixes are available

Subscribe

APAR status

Closed as program error.

Error description

Local fix

Problem summary

Problem conclusion

Temporary fix

Comments

APAR Information

APAR number

Reported component name

Reported component ID

Reported release

Status

PE

HIPER

Special Attention

Submitted date

Closed date

Last modified date

APAR is sysrouted FROM one or more of the following:

APAR is sysrouted TO one or more of the following:

Fix information

Fixed component name

Fixed component ID

Applicable component levels

R700 PSY UK51554

Fix is available

Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.

Document Information

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