PQ89799: DELAY FROM THE WAS HTTP TRANSPORT FROM SENDING BACK AN ACK.

 A fix is available

Obtain the fix for this APAR



APAR status
Closed as program error.

Error description
A delay from the WAS HTTP transport from sending back ACK is
creating a performance problem.
Initially seeing a 300 ms delay when the request went to the
HTTP in IHS and ASDisableNagle was set to true.
Local fix Problem summary
****************************************************************
* USERS AFFECTED: All users of WebSphere Application Server    *
*                 V5.0 for z/OS                                *
****************************************************************
* PROBLEM DESCRIPTION: Perfomance issues with Servlet flush()  *
*                      support on z/OS.                        *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
After support was added for the servlet API flush() method, it
was determined that several Web Container flush() calls are
made when driving chained or forwarded servlets. These internal
flush() calls were causing unnecessary traffic between the
Controller and Servant regions.
In addition, the Servlet API isCommmitted() call was always
returning false with Servlet Caching enabled on the Web
Container.
Problem conclusion
The Web Container has been changed to suppress its internal
flush() calls. Response data will be buffered until an
application flush() call is made, or the response buffer size
limit is reached, or the servlet's service method exits.
In addition, the Servlet API isCommitted() call has been
modified to return the correct value when Servlet Caching is in
effect.

APAR PQ89799 is associated with SERVICE LEVEL W502012 of
WebSphere Application Server V5.0 for z/OS.
Temporary fix Comments
ž**** PE04/10/11 FIX IN ERROR. SEE APAR 
PQ95568  FOR DESCRIPTION
APAR information
APAR number PQ89799
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 2004-06-07
Closed date 2004-06-30
Last modified date 2004-10-28

APAR is sysrouted FROM one or more of the following:

APAR is sysrouted TO one or more of the following:

Modules/Macros
BBOUBINF          

Publications Referenced

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

Applicable component levels
R500 PSY UQ90251    UP04/07/09 P F407

  Fix is available
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Document Information


Current web document: swg1PQ89799.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 #: PQ89799
IBM Group: Software Group
Modified date: Oct 28, 2004