Fix (APAR):  PI41114

Status:  Fix

Release:  8.5.5.6,8.5.5.5,8.5.5.4

Operating System:  AIX,HP-UX,Inspur K-UX,Linux,Mac OS,Solaris,Windows,z/OS

Supersedes Fixes:  

CMVC Defect:  xxxxxx

Byte size of APAR:  262849

Date: 2015-08-06

Abstract:  apc hang problem causing uneven load balancing

Description/symptom of problem:  
PI41114 resolves the following problem:

ERROR DESCRIPTION:                                              
WebSphere Application Server logs contain errors like these:    
DCPC0322I: The application placement controller detected that   
the system performance can be improved by a reallocation of     
dynamic cluster instances. Review the strategy for              
automatically modifying the placement of dynamic cluster        
instances in the action plan.  The dynamic cluster operating    
mode is set to automatic.                                       
DCPC0342I: The Application Placement Controller is suggesting   
to stop server because it is on a host with insufficient memory.
NGRP0010E: Error notifying app placement controller of          
maintenance mode change on node <nodename> to value false.      
Exception: javax.management.MBeanException: RuntimeException    
thrown in RequiredModelMBean                                    

LOCAL FIX:                                                      
none                                                            

PROBLEM SUMMARY

USERS AFFECTED:
 All users of the Dynamic cluster
function in IBM WebSphere Application
Server

PROBLEM DESCRIPTION:
After the Application Placement
controller (APC) takes some multiple
placement actions, it stops working.

RECOMMENDATION:
None

The Application Placement Controller (dynamic cluster
function) stops working.

PROBLEM CONCLUSION:                                             
The problem in the product code has been identified and         
corrected.                                                      
                                                                
The fix for this APAR is currently targeted for inclusion in    
fix pack 8.5.5.7.  Please refer to the Recommended Updates      
page for delivery information:                                  
http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980   


Directions to apply fix:  
Fix applies to Editions:
Release 8.5
__ Application Server (Express or BASE)
_X Network Deployment (ND)
__ Liberty Core
__ Edge Components
__ Developer

Install Fix to all WebSphere installations unless special instructions are included below.

Special Instructions: None

NOTE:
The user must:
* Logged in with the same authority level when unpacking a fix, fix pack or refresh pack.
* Be at V1.4.3 or newer of the Installation Manager. Certain iFixes may require a newer version of the Installation Manager and the Installation Manager will inform you during the installation process if a newer version is required.

The IBM Knowledge Center can provide details, if needed, on the use of the Installation Manager to apply the iFixes.
http://publib.boulder.ibm.com/infocenter/install/v1r4/index.jsp.  Shutdown WebSphere Application Server before applying the iFixes.  Restart WebSphere Application Server after applying the iFixes.

Directions to remove fix:  

The IBM Knowledge Center can provide details, if needed, on the use of the Installation Manager to remove the iFixes.
http://publib.boulder.ibm.com/infocenter/install/v1r4/index.jsp.  Shutdown WebSphere Application Server before removing the iFixes.  Restart WebSphere Application Server after removing the iFixes.

Directions to re-apply fix:  
1) Shutdown WebSphere Application Server.

2) Follow the Fix instructions to apply the fix.

3) Restart WebSphere Application Server.



Additional Information: