Fix (APAR):  PI53566

Status:  Fix

Release:  8.5.5.8,8.5.5.7,8.5.5.6,8.5.5.5,8.5.5.4,8.5.5.3

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

Supersedes Fixes:  PI45639,PI47114,PI50672,PI51978

CMVC Defect:  xxxxxx

Byte size of APAR:  277676

Date: 2016-03-10

Abstract:  on demand router memory leak when upgrading applications under load

Description/symptom of problem:  
PI53566 resolves the following problem:

ERROR DESCRIPTION:                                              
The On Demand Router (ODR) has a memory leak related to         
HttpRouteAction objects such that when the system is under load 
and there are configuration changes such as uninstalling and    
installing applications it is possible that multiple, redundant 
HttpRouteAction objects can be created with registered          
listeners for ODC tree changes but never removed.  This will    
eventually fill up the available heap space and cause an Out Of 
Memory issue on the ODR.  Restarting the ODR will correct the   
problem.                                                        

LOCAL FIX:                                                      
Restart the ODR.                                                

PROBLEM SUMMARY

USERS AFFECTED:
 All users of IBM WebSphere Application
Server Intelligent Management using the
java On Demand Router (ODR).

PROBLEM DESCRIPTION:
An Out Of Memory error can be seen on
the On Demand Router because
HttpRouteAction objects can
accumulate.

RECOMMENDATION:
None

There is a code bug where HttpRouteAction objects can
accumulate because they are not freed. This is particularly
noticeable when there are routing rules present, many
applications installed, and multiple configuration changes
happening on the system (such as installing or removing
applications). Over time this can cause exhaustion of the
available heap and an Out Of Memory error for the On Demand
Router.

PROBLEM CONCLUSION:                                             
The area of code was corrected to release the HttpRouteAction   
objects. This fix supercedes PI51978.                           
                                                                
The fix for this APAR is currently targeted for inclusion in    
fix pack 8.5.5.9.  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: