PK13087: CacheMonitor application triggering OutOfMemory condition

 Fixes are available

PK13087; 5.1.1.7: CacheMonitor application triggering OutOfMemory condition
PK13087; 5.1.1.7: CacheMonitor application triggering OutOfMemory condition
5.0.2.17: WebSphere Application Server 5.0.2 Cumulative Fix 17 for Solaris
5.0.2.17: WebSphere Application Server 5.0.2 Cumulative Fix 17 for Windows
5.1.1.10: WebSphere Application Server V5.1.1 Cumulative Fix 10 for Windows
5.1.1.10: WebSphere Application Server V5.1.1 Cumulative Fix 10 for AIX
5.0.2.17: WebSphere Application Server 5.0.2 Cumulative Fix 17 for HP-UX
5.0.2.17: WebSphere Application Server 5.0.2 Cumulative Fix 17 for AIX
5.0.2.17: WebSphere Application Server 5.0.2 Cumulative Fix 17 for Linux
5.1.1.10: WebSphere Application Server V5.1.1 Cumulative Fix 10 for HP-UX
5.1.1.10: WebSphere Application Server V5.1.1 Cumulative Fix 10 for Linux
5.0.2.16: WebSphere Application Server 5.0.2 Cumulative Fix 16 for HP-UX
5.0.2.16: WebSphere Application Server 5.0.2 Cumulative Fix 16 for Solaris
5.0.2.16: WebSphere Application Server 5.0.2 Cumulative Fix 16 for Windows
5.0.2.16: WebSphere Application Server 5.0.2 Cumulative Fix 16 for AIX
5.0.2.18: WebSphere Application Server 5.0.2 Cumulative Fix 18 for Solaris
5.0.2.18: WebSphere Application Server 5.0.2 Cumulative Fix 18 for Windows
5.0.2.18: WebSphere Application Server 5.0.2 Cumulative Fix 18 for HP-UX
5.0.2.18: WebSphere Application Server 5.0.2 Cumulative Fix 18 for AIX
5.0.2.18: WebSphere Application Server 5.0.2 Cumulative Fix 18 for Linux
5.0.2.16: WebSphere Application Server 5.0.2 Cumulative Fix 16 for Linux
5.1.1.10: WebSphere Application Server V5.1.1 Cumulative Fix 10 for Solaris



APAR status
Closed as program error.

Error description
Currently CacheMonitor application fetches all the cache entries
in memory (on the JVM heap) in one go when the client clicks
on 'Cache Contents' link, stores all cache entries on the
session and displays 100 entries at a time. Under some
circumstances the attribute on the session can be quite large,
such as >10 MB, some tests with WCS (WebSphere
Commerce Suite) application showed that the object that was
created by CacheMonitor application can be >40 MB.  This
can cause several problems, such as OutOfMemory conditions
on the heap, temporary performance degradation when the
large object is allocated on the heap, failures when this
Dynacache attribute is replicated across several nodes or
persisted to a database.
.
We will need to create a new version of CacheMonitor
application which will not create a large object on the heap &
which will not store it  (cache entries) on the session.
Local fix
Not available at this time, the workaround is not to use
CacheMonitor application at all so that it will not create
a large object on the heap.
Problem summary
****************************************************************
* USERS AFFECTED: All WebSphere Application Server users       *
*                 using the Cache Monitor application          *
****************************************************************
* PROBLEM DESCRIPTION: Cache Monitor application triggering    *
*                      OutOfMemory condition                   *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
When viewing cache contents via the CacheMonitor application,
Cache Monitor saves all the cache contents as a request
attribute and displays them 100 at a time. This triggers an
OutOfMemory condition
Problem conclusion
This apar fixes the OutOfMemory condition triggered by the
Cache Monitor application.

The fix for this APAR is currently targeted for inclusion
in cumulative fixes 5.02.16 and 5.1.1.10.
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 PK13087
Reported component name WAS NETWRK DEPL
Reported component ID 5630A3601
Reported release 00A
Status CLOSED PER
PE NoPE
HIPER NoHIPER
Special Attention NoSpecatt
Submitted date 2005-10-06
Closed date 2006-01-12
Last modified date 2006-01-12

APAR is sysrouted FROM one or more of the following:

APAR is sysrouted TO one or more of the following:

Modules/Macros
CACHEMON          

Publications Referenced

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

Applicable component levels
R003 PSY    UP
R00A PSY    UP
R00H PSY    UP
R00I PSY    UP
R00P PSY    UP
R00S PSY    UP
R00W PSY    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: 00A
Software edition:
Reference #: PK13087
IBM Group: Software Group
Modified date: Jan 12, 2006