PQ68522: CLUSTERED WEBSPHERE WITH WLM ON AIX GETS OUTOFMEMORY ERRORS.

 A fix is available

4.0.5: WebSphere Application Server Version 4.0 Fix Pack 5 (Version 4.0.5)



APAR status
Closed as program error.

Error description
If WLM is not in use, then the locatedIOR for a given
ClientDelegate will not change.  However, if WLM is in use,
then each call to the WLM getNextTarget() will return a new
IOR pointing to a different clone.
.
The threading problem arises when multiple client threads
access the same instance of ClientDelegate.  Thread 1 (T-1)
stub calls this ClientDelegate createRequest, which sets
locatedIOR based on a call to WLM getNextTarget.  Thread 2
(T-2) stub calls this same ClientDelegate createRequest,
which re-sets locatedIOR to another value based on a call
to WLM getNextTarget.  That is, T-1 stub uses the value
IOR-1 to talk to the first clone, and T-2 stub uses the
value IOR-2 to talk to a second clone.  The problem is that
ClientDelegate locatedIOR was not thread-specific, so after
T-2 had modified the located IOR, T-1 would call another
ClientDelegate method such as invoke(), and it would try to
use the wrong locatedIOR, IOR-2.
Local fix Problem summary
****************************************************************
* USERS AFFECTED: WebSphere Application Server users of Work   *
*                 Load Management (WLM).                       *
****************************************************************
* PROBLEM DESCRIPTION: When using 4.0.4 with WLM enabled, a    *
*                      memory leak was observed.               *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
Memory leak in ORB component during stress test while user
enabled WLM.
Problem conclusion
ORB component substitutes the ThreadLocal object with
Hashtable object to avoid memory leak.
Temporary fix Comments
APAR information
APAR number PQ68522
Reported component name WEBSPHERE AE AI
Reported component ID 5630A2200
Reported release 400
Status CLOSED PER
PE NoPE
HIPER NoHIPER
Submitted date 2002-11-22
Closed date 2003-01-05
Last modified date 2003-01-17

APAR is sysrouted FROM one or more of the following:
IY37467

APAR is sysrouted TO one or more of the following:

Modules/Macros
ORB          

SRLS

Fix information
Fixed component name WEBSPHERE AE AI
Fixed component ID 5630A2200

Applicable component levels
R400 PSY    UP


Document Information


Product categories: Software > Application Servers > Distributed Application & Web Servers > WebSphere Application Server > General
Operating system(s):
Software version: 400
Software edition:
Reference #: PQ68522
IBM Group: Software Group
Modified date: Jan 17, 2003