Fix (APAR):  PH46154

Status:  Fix

Release:  8.5.5.22

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

Supersedes Fixes:  

CMVC Defect:  xxxxxx

Byte size of APAR:  303002

Date: 2022-10-31

Abstract:  blocked threas in com/ibm/ws/bo/boextendedmetadata.containspackage under heavy load

Description/symptom of problem:  
PH46154 resolves the following problem:

ERROR DESCRIPTION:
If a user application is programmed to create a lot of          
DataObjects, this will have a significant performance impact and
may result in hung threads.                                     

LOCAL FIX:
                                                                

PROBLEM SUMMARY

USERS AFFECTED:
 All users of IBM Business Automation
Workflow which uses Eclipse Modeling
Framework (EMF) included in WebSphere
Application Server

PROBLEM DESCRIPTION:
Slow performance noticed in Eclipse
Modeling Framework (EMF) included in
WebSphere Application Server.

RECOMMENDATION:
None

The EPackageRegistry component of EMF has synchronization
which makes usage by multiple threads mutually exclusive.  This
blocking of other threads causes a performance problem in IBM
Business Automation Workflow.
The reason for the synchronization is that packages may be
added or removed from the registry while the package registry
is being accessed.

PROBLEM CONCLUSION:
A new API is added to the EMF library included in               
WebSphere Application Server which can be used to indicate      
that no further updates will be made to the package registry.   
When this API is called, EMF will stop using synchronization    
in the EPackageRegistry.                                        
                                                                
Business Automation Workflow APAR JR64790 adds usage of this    
new API which removes the performance problem.                  
                                                                
The fix for this APAR is targeted for inclusion in fix pack     
8.5.5.23 and 9.0.5.13. For more information, see 'Recommended   
Updates for WebSphere Application Server':                      
https://www.ibm.com/support/pages/node/715553                   


Directions to apply fix:  Fix applies to Editions:
Release 8.5
_x_ 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: