APAR status
Closed as program error.
Error description
The application server had been set up to use Memory to Memory
replication of HTTP Session objects between application servers
in the cluster. It was observed that when such a cluster of
application servers was subjected to a high stress of HTTP
requests, JMSMessageQueueOverflowExceptions were seen in the
logs and traces. The problem was isolated to the Data
Replication component.
Local fix
A fix for this problem has been provided in the cumulative fix
dated 09/26 for the Data Replication component. The fix involved
fixing some synchronization issues and revising queue sizes, so
that they can withstand elevated loads.
Problem summary
****************************************************************
* USERS AFFECTED: All users of Websphere Application Server *
* using HTTPSession Memory to memory *
* replication for failover capability. *
****************************************************************
* PROBLEM DESCRIPTION: When configured to use Memory to *
* memory replication for HTTP Session *
* replication, the application server *
* throws JMSMessageQueueOverflow *
* Exceptions under stress. *
****************************************************************
* RECOMMENDATION: *
****************************************************************
The problem is caused by messages being received faster than
the rate at which they can be processed, thereby causing the
queue to overflow.
Problem conclusion
This defect has been fixed in the cumulative fix
of the Data Replication component for the 5.0.1 release.
(WAS_DRS_09-26-2003_5.0.1_cumulative_Fix). The fix involved
fixing some synchronization issues & revising queue sizes so
that they can withstand elevated loads.
Temporary fix
WAS_Sessions_07-09-2003_5.0.1-5.0.0_cumulative_Test
Comments
APAR information |
APAR number |
PQ75365 |
Reported component name |
WEBSPHERE AE AI |
Reported component ID |
5630A3600 |
Reported release |
00A |
Status |
CLOSED PER |
PE |
NoPE |
HIPER |
NoHIPER |
Special Attention |
NoSpecatt |
Submitted date |
2003-06-17 |
Closed date |
2003-10-03 |
Last modified date |
2003-10-03 |
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
PQ79096
Modules/Macros
Publications Referenced
Applicable component levels |
R00A PSY |
UP |
R00W PSY |
UP |
|