PQ75605, 4.0.4, 4.0.5, 4.0.6: Periodic loss of Administration
 Downloadable files
 
Abstract
Administration server hangs and the admin server will error; OutOfMemory.
This APAR marks only remote nodes off-line,
 
Download Description

USERS AFFECTED:
WebSphere Application Server 4.0 users with a heavily loaded system,(more than 50 application server).

PROBLEM DESCRIPTION:
Limited to no administration capabilities which appear to stem from an Admin Server hanging.
Intermittent hangs occur when a system is heavily loaded (more than 50 application servers).

RECOMMENDATION:
On heavily loaded systems, the admin server will hang in the checkOutOfOrders method waiting for an epoch change, which will never happen. It was determined that whenever a module failed to start, an epoch change was erroneously being made by the node, resulting in the node marking itself offline. Then, during subsequent application server starts, the admin server will wait for an epoch change on the node, which never takes place.

PROBLEM CONCLUSION:
Two modifications were made:
1. The code will prevent a node from marking itself offline.
2. The code was modified so the indefinite wait in CheckOutOfOrders module was changed to a timed wait and rollback.
 
Prerequisites
-WebSphere Application Server 4.0.5 and 4.0.6 the interm-fix can be applied as is.
-WebSphere Application Server 4.0.4 the Interm-fix will need the prerequisite SM cumulative ifix:
WAS_SysMgmt_05-01-2003_4.0.5-4.0.4-4.0.3-4.0.2_AE_Solaris_cumulative APAR
 
 
Installation instructions
Please review the readme.txt for detailed instructions.
 
URL LANGUAGE SIZE(Bytes)
Readme US English 3326
 
Download package
What is DD?
DOWNLOAD RELEASE DATE LANGUAGE SIZE(Bytes) Download Options
PQ75605 8/19/2003 US English 1110256 FTP DD
 
Technical support
1-800-IBM-SERV(US-Only)
 
Problems (APARs) fixed
PQ75605
 
 


Document Information


Product categories: Software > Application Servers > Distributed Application & Web Servers > WebSphere Application Server > General
Operating system(s): HP-UX
Software version: 4.0.5
Software edition:
Reference #: 4005170
IBM Group: Software Group
Modified date: Aug 25, 2003