PQ57888: TWO SERVER REGIONS WITH SESSION.DBENABLE=FALSE NOT WORKING

 A fix may be available

Obtain the fix for this APAR



APAR status
Closed as program error.

Error description
When customer has two server regions running, the session state
data seems to be lost if the session is managed by a server
other than the initial one that established the session.
Customer has session.dbenable=false and would like to have the
problem fixed instead of changing to session.dbenable=true.
Local fix
Change to session.dbenable=true.
Problem summary
****************************************************************
* USERS AFFECTED: Any WebSphere Application Server Version     *
*                 V4.0.1 for z/OS and OS/390 user attempting   *
*                 to save HTTP Session state in-memory while   *
*                 running multiple server regions under a      *
*                 single control region will experience        *
*                 apparent session data loss.                  *
****************************************************************
* PROBLEM DESCRIPTION: Session data will intermittently be     *
*                      lost between HTTP requests.             *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
When session data is stored in-memory, it cannot be shared
across server regions.  If a session is created in one server
region, any request that gets routed to a different server
region will not have access to the session data.  A new session
will be created in this server region, thus making it appear to
the application that the initial session data has been lost.
  Internally, the data has not actually been lost, but it can
no longer be accessed.  Even if a subsequent request goes back
to the original server region, the session ID provided by the
client will be that of the new session, so the original session
will eventually time out and the data will be invalidated.
Problem conclusion
With this new support, called Session Affinity, all requests
specific to a particular session will be routed back to the
server region where the session was created.

This change affects COMPID 5655A9800 R401 for z/OS and OS/390.
The code changes are stored in CMVC under defect PQ57888, 80388,
and 80448.

Documentation Change:

A separate document, entitled "WebSphere Application
Server V4.0.1 for z/OS and OS/390: Session Affinity" is
available for this APAR.  To download the document, go to
the following Web site, then click "Product information."

  
http://www-4.ibm.com/software/webservers/appserv/zos_os390
         /support.html

At a later time, the information in this document will be
integrated into the WebSphere for z/OS formal
publications.  To access the latest publications, go to
the product library page at:

   
http://www-4.ibm.com/software/webservers/appserv/zos_os390

401Y
EJSCASIN
EJSCCLAS
EJSCCMSV
EJSCCNFG
EJSCJNUT
EJSCJNWR
EJSCLOAD
EJSCLOGR
EJSCOEUT
EJSCOSUT
EJSCPLUG
EJSCPLUT
EJSCPOOL
EJSCPROP
EJSCRULS
EJSCSTUB
EJSCSVHS
EJSCVALD
EJSCVERS
EJSCWSUT
EJSJSVJR
EJSJWBJR
EJSJWCSC
EJSJWCWC
EJSJWC04
EJSLNLS
EJSPWCNF
EJSTLDAT
EJSXASIN
EJSXJVMX

* Cross Reference between External and Internal Names
Temporary fix Comments
APAR information
APAR number PQ57888
Reported component name WEBSPHERE OS/39
Reported component ID 5655A9800
Reported release 401
Status CLOSED PER
PE NoPE
HIPER NoHIPER
Submitted date 2002-02-15
Closed date 2002-03-12
Last modified date 2002-04-02

APAR is sysrouted FROM one or more of the following:

APAR is sysrouted TO one or more of the following:

Modules/Macros
EJSCASIN EJSCCLAS EJSCCMSV EJSCCNFG EJSCJNUT EJSCJNWR
EJSCLOAD EJSCLOGR EJSCOEUT EJSCOSUT EJSCPLUG EJSCPLUT
EJSCPOOL EJSCPROP EJSCRULS EJSCSTUB EJSCSVHS EJSCVALD
EJSCVERS EJSCWSUT EJSJSVJR EJSJWBJR EJSJWCSC EJSJWCWC
EJSJWC04 EJSLNLS EJSPWCNF EJSTLDAT EJSXASIN EJSXJVMX

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

Applicable component levels
R401 PSY UQ64031    UP02/03/21 P F203

  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: 401
Software edition:
Reference #: PQ57888
IBM Group: Software Group
Modified date: Apr 2, 2002