PQ87841: SHIP INTERNAL DEFECTS FOR SERVICE LEVEL W502007

 A fix is available

Obtain the fix for this APAR



APAR status
Closed as program error.

Error description
Ship internal defect fixes for Service Level W502007.
Local fix Problem summary
****************************************************************
* USERS AFFECTED: All users of WebSphere Application Server    *
*                 V5.0 for z/OS                                *
****************************************************************
* PROBLEM DESCRIPTION: APAR PQ878415 addresses various defects *
*                      in WebSphere Application Server V5.0    *
*                      for z/OS:                               *
*                                                              *
*                      (LIDB3082.1) WebSphere Application      *
*                      Server V5.0 for z/OS support for        *
*                      z/OS Work Load Manager (WLM)            *
*                      APAR 
OA04699.                           *
*                                                              *
*                      (MD19774) Heap damaged when running     *
*                      with detailed tracing on. CEE3703I In   *
*                      HANC Control Block, the Eye Catcher is  *
*                      damaged. CEE0802C Heap storage control  *
*                      information was damaged.                *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
APAR PQ87841 addresses the following defects in
WebSphere Application Server V5.0 for z/OS:

(LIDB3082.1) WebSphere Application Server for z/OS support for
z/OS WLM APAR 
OA04699.  The issue addressed by this fix is the
lack of even distribution of stateful sessions across all
available servants due to the fact that, at the time the
sessions are established, the system workload is low and thus
the "first available" servant (as determined by WLM to direct
work) is repeatedly the same servant.  While system workload
remains low, stateful sessions accumulate in the same "first
available" servant.  When workload increases, the established
stateful sessions force all work to be directed to the same
servant (that contains all the sessions) while all the other
servants maintain low workloads, or are simply idle waiting
for non-stateful work.

(MD19757) The comm_outbound_locate method creates a detailed
trace that includes a uuid from the object key found in the
IOR. The object key in an initial lookup IOR does not have a
uuid. The uuid is treated as a string. When comm_outbound_locate
copies what it thinks is a uuid it copies until a null is
encountered. The amount copied ends up being larger than was
allocated for the target.

CEE3701W Heap damage found by HEAPCHK run-time option.
CEE3707I Left  pointer is bad in the free tree at 2BF70CC8 in
         the heap segment beginning at 2BF14000.
2BF70CA8: 8194857E 8296A2A2 F0F1F0F6 4B979385
          A7F14B93 F24B8982 944B8396 94409796
2BF70CC8: 99A37EF9 F8F1F200 00000080 00000000
          00000000 00000000 00000000 00000000
CEE3707I Right pointer is bad in the free tree at 2BF70CC8 in
         the heap segment beginning at 2BF14000.
2BF70CA8: 8194857E 8296A2A2 F0F1F0F6 4B979385
          A7F14B93 F24B8982 944B8396 94409796
2BF70CC8: 99A37EF9 F8F1F200 00000080 00000000
          00000000 00000000 00000000 00000000
CEE3702S Program terminating due to heap damage.
Problem conclusion
APAR PQ87841 fixes various defects in WebSphere Application
Server V5.0 for z/OS.

(LIDB3082.1) This support allows the WebSphere administrator
to select a WLM distribution scheme for the placement of
stateful sessions. The default scheme is FIRST AVAILABLE
distribution, in which a newly established stateful session is
placed in the first available servant.  When workloads are low,
this scheme could possibly result in a disproportionate number
of stateful sessions being established in one particular servant
rather than evenly distributed across all available servants.
The alternative WLM distribution scheme is ROUND ROBIN, in which
stateful sessions are evenly established across all available
servants in a round robin distribution pattern, regardless of
system workload.

Please note:

Support provided by feature LIDB3082.1 delivered in APAR PQ87841
requires support provided by z/OS Work Load Manager (WLM)
APAR 
OA04699 to be made functional. The support provided in APAR
PQ87841 has been coded in such a manner that if the 
OA04699
support is not present on a system running with Service Level
W401611 (Service Level W401611 delivers APAR PQ87841) then the
support provided in APAR PQ87841 will not be active. There
exists no SMP/E apply dependency on the z/OS Work Load Manager
support provided by APAR 
OA04699, it is a functional runtime
issue.

Feature LIDB3082.1 delivered in APAR PQ87841 requires the
following change to the InfoCenter. To access the
latest online documentation, go to the product library page at:

www.ibm.com/software/webservers/appserv/zos_os390/library/

The change involves adding two new files to the InfoCenter:
"Configuring an Application Server to use the WLM even
distribution of HTTP requests function"
(trun_wlmsessionplacement.html) and
"WLM even distribution of HTTP requests"
(crun_wlm_sessionplacement.html)

In addition, the following description of the new
WebSphere variable has been added to the article
"Cell-wide z/OS variables:"

wlm_stateful_session_placement_on
Set this value to 1 to enable HTTP requests to be distributed
across servant regions without servant region affinity. See
"Configuring an Application Server to use the WLM even
distribution of HTTP requests function" for more information.

(MD19757) Changed comm_outbound_locate method to not look for a
uuid in a initial lookup IOR.

APAR PQ87841 is associated with SERVICE LEVEL W502007 of
WebSphere Application Server V5.0 for z/OS.
Temporary fix Comments
APAR information
APAR number PQ87841
Reported component name WEBSPHERE FOR Z
Reported component ID 5655I3500
Reported release 500
Status CLOSED PER
PE NoPE
HIPER NoHIPER
Special Attention NoSpecatt
Submitted date 2004-04-21
Closed date 2004-04-28
Last modified date 2004-05-05

APAR is sysrouted FROM one or more of the following:

APAR is sysrouted TO one or more of the following:
UQ87899

Modules/Macros
BBOCESES BBOCGIOP BBOCHSES BBOCHSSS BBOCHTTP BBOCSESS
BBOCSMGR BBOCSMHS BBOCSMRE BBOCSMRH BBOCSMRI BBOCSM
***This field was truncated. To obtain
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Publications Referenced

Fix information
Fixed component name WEBSPHERE FOR Z
Fixed component ID 5655I3500

Applicable component levels
R500 PSY UQ87899    UP04/05/03 P F404

  Fix is available
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Document Information


Current web document: swg1PQ87841.html
Product categories: Software > Application Servers > Distributed Application & Web Servers > WebSphere Application Server for z/OS
Operating system(s):
Software version: 500
Software edition:
Reference #: PQ87841
IBM Group: Software Group
Modified date: May 5, 2004