PK04470: MESSAGE-DRIVEN BEANS STOP RECEIVING MESSAGES AFTER UPGRADE TO WEBSPHERE APPLICATION SERVER V5.1.1.4

 Fixes are available

PK04470; 5.1.1.4: Deadlock condition after server session was returned to pool
5.1.1.8: WebSphere Application Server 5.1.1 Cumulative Fix 8 for AIX
5.1.1.8: WebSphere Application Server 5.1.1 Cumulative Fix 8 for Windows
5.1.1.8: WebSphere Application Server 5.1.1 Cumulative Fix 8 for HP-UX
5.1.1.8: WebSphere Application Server 5.1.1 Cumulative Fix 8 for Solaris
5.1.1.6: WebSphere Application Server Version 5.1.1 Cumulative Fix 6
5.1.1.7: WebSphere Application Server Version 5.1.1 Cumulative Fix 7
PK09325; 5.1.1.4: Deadlock conditions after server sessions are returned to pool
5.1.1.8: WebSphere Application Server 5.1.1 Cumulative Fix 8 for Linux
PK09325; 5.1.1.4: Deadlock conditions after server sessions are returned to pool



APAR status
Closed as program error.

Error description
Due to an error in one of the APARs that was included in
Cumulative Fix 4 (V5.1.1.4) for WebSphere Application Server
V5.1.1, message-driven beans (MDBs) will only process a small
number of messages after starting.  Additional messages will
remain on the queue or topic and the MDB will not receive them.
The number of messages that the MDB will receive after it starts
is equal to the Maximum sessions setting on the listener port
that the MDB is associated with.
.
This problem only occurs in WebSphere Application Server
V5.1.1.4, but it impacts all users of MDBs at the V5.1.1.4
level.
Local fix Problem summary
****************************************************************
* USERS AFFECTED: WebSphere Application Server version 5.1.1.x *
*                 users                                        *
****************************************************************
* PROBLEM DESCRIPTION: After several hours of a long-running   *
*                      test, the application Message-Driven    *
*                      Beans (MDBs) stopped receiving          *
*                      messages.                               *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
This i-fix prevented a three way deadlock which was the
original error. Once all the server sessions have been used the
queue agent will block until another one becomes available.
The problem here was that when a server session was returned to
the pool the queue agent would pick it up and the pool would
become empty again.  It would then continue to block due to the
pool being empty even though it had just obtained a server
session.  The only way it would come out of this is if two
server sessions became available at the same time.
Problem conclusion
The call to obtain a server session was moved out of the while
loop that ensures the pool is not empty.

The fix for this APAR is currently targeted for inclusion
in 5.1.1.5.
Please refer to the recommended updates page for delivery
information:

http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
Temporary fix Comments
APAR information
APAR number PK04470
Reported component name WAS NETWRK DEPL
Reported component ID 5630A3601
Reported release 10A
Status CLOSED PER
PE NoPE
HIPER NoHIPER
Special Attention NoSpecatt
Submitted date 2005-04-19
Closed date 2005-04-25
Last modified date 2007-06-26

APAR is sysrouted FROM one or more of the following:

APAR is sysrouted TO one or more of the following:

Modules/Macros
MQ          

Publications Referenced

Fix information
Fixed component name WAS NETWRK DEPL
Fixed component ID 5630A3601

Applicable component levels
R003 PSN    UP
R00A PSN    UP
R00H PSN    UP
R00I PSN    UP
R00P PSN    UP
R00S PSN    UP
R00W PSN    UP
R103 PSY    UP
R10A PSY    UP
R10H PSY    UP
R10I PSY    UP
R10P PSY    UP
R10S PSY    UP
R10W PSY    UP


Document Information


Product categories: Software > Application Servers > Distributed Application & Web Servers > WebSphere Application Server > General
Operating system(s):
Software version: 10A
Software edition:
Reference #: PK04470
IBM Group: Software Group
Modified date: Jun 26, 2007