PQ55344: ALTHOUGH SERVLET RELOADING IS NOT SUPPORTED FOR V4.0, IT IS NOT DISABLED AND CAUSES A PERFORMANCE DEGRADATION

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APAR status
Closed as program error.

Error description
Performance is degraded in WebSphere Application Server
Version 4.0 for z/OS and OS/390.  This is due to class
reloading being enabled at a 3-second interval, by default,
even though servlet reloading is not supported for V4.0.
Local fix Problem summary
****************************************************************
* USERS AFFECTED: All users of WebSphere Application Server    *
*                 Version 4.0 for z/OS and OS/390.             *
****************************************************************
* PROBLEM DESCRIPTION: Although servlet reloading is not       *
*                      supported, the reloading function in    *
*                      the Web container of WebSphere          *
*                      Application Server Version 4.0 for z/OS *
*                      and OS/390 is, by default, enabled and  *
*                      occurs at 3-second intervals.  This     *
*                      causes a performance degradation.       *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
The servlet reloading function that existed in previous versions
of the Application Server is not supported for Version 4.0 for
z/OS and OS/390.  WLM commands are now used to refresh servlets
without causing an interruption of service.  However, the
reloading function is not currently disabled, causing a
significant performance degradation for the Web container.

A timer thread checks every three seconds for classes needing
to be reloaded.  If any class needs to be reloaded, all classes
currently loaded in the Web application's class loader are
reloaded.  This causes significant overhead.  Class reloading
is disabled in Version 4.0.1, and needs to be disabled in
Version 4.0.
Problem conclusion
The WebSphere Application Server Version 4.0 for z/OS and OS/390
is changed to fully disable servlet reloading to improve the
performance of the Web container.

The following COMPID is affected by these changes:

5655A9800 R400 on z/OS and OS/390.

The code changes are stored in CMVC under defect 79101.

400Y
EJSJWCWC

* Cross Reference between External and Internal Names
Temporary fix Comments
APAR information
APAR number PQ55344
Reported component name WEBSPHERE OS/39
Reported component ID 5655A9800
Reported release 400
Status CLOSED PER
PE NoPE
HIPER NoHIPER
Submitted date 2001-11-30
Closed date 2001-12-10
Last modified date 2002-01-03

APAR is sysrouted FROM one or more of the following:

APAR is sysrouted TO one or more of the following:

Modules/Macros
EJSJWCWC          

Fix information
Fixed component name WEBSPHERE OS/39
Fixed component ID 5655A9800

Applicable component levels
R400 PSY UQ60995    UP01/12/14 P F112

  Fix is available
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Document Information


Product categories: Software > Application Servers > Distributed Application & Web Servers > WebSphere Application Server for z/OS
Operating system(s):
Software version: 400
Software edition:
Reference #: PQ55344
IBM Group: Software Group
Modified date: Jan 3, 2002