PI93114: Prevent thread hang by removing unnecessary sleep in WLM RuleEtiquette.registerNotificationType

APAR status

• Closed as program error.

Error description

• Under certain rare conditions customers may experience a
  thread hang in the WLM RuleEtiquette.registerNotificationType.
  This is an example stack:
  
  [15/02/10 17:56:44:809 JST] 0000008a TimeoutManage IWTRN0124I:
  
  Thread[WorkManager.DefaultWorkManager : 1,5,main] ...
  java.lang.Thread.sleep(Native Method)
  java.lang.Thread.sleep(Thread.java:908)
  com.ibm.ws.cluster.selection.rule.
  RuleEtiquette.registerNotificationType(RuleEtiquette.java:328)
  com.ibm.ws.cluster.router.selection.IIOPSelectionCriteria.subset
  (IIOPSelectionCriteria.java:94)
  

Local fix

• Customers can implement this custom parameter in their
  application.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server                                      *
  ****************************************************************
  * PROBLEM DESCRIPTION: Under certain rare conditions           *
  *                      customers may experience a              *
  *                      thread hang in the WLM                  *
  *                      RuleEtiquette.registerNotificationType. *
  *                                                              *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  :
  Under certain rare conditions customers may experience a
  thread hang in the WLM RuleEtiquette.registerNotificationType.
  This is an example stack:
  [15/02/10 17:56:44:809 JST] 0000008a TimeoutManage IWTRN0124I:
  Thread[WorkManager.DefaultWorkManager : 1,5,main] ...
  java.lang.Thread.sleep(Native Method)
  java.lang.Thread.sleep(Thread.java:908)
  com.ibm.ws.cluster.selection.rule.
  RuleEtiquette.registerNotificationType(RuleEtiquette.java:328)
  com.ibm.ws.cluster.router.selection.IIOPSelectionCriteria.subset
  (IIOPSelectionCriteria.java:94)
  

Problem conclusion

• This problem in the WebSphere distributed WLM component is
  resolved by removing an unnecessary sleep in WLM
  RuleEtiquette.registerNotificationType
  which under certain rare conditions can cause thread hangs.
  
  The fix for this APAR is currently targeted for inclusion in
  fix pack 8.5.5.14 and 9.0.0.8.  Please refer to the Recommended
  Updates
  page for delivery information:
  http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
  

Temporary fix

• no temporary fix
  

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  WEBS APP SERV N

• Fixed component ID

  5724H8800

Applicable component levels

• R850 PSY

     UP

• R900 PSY

     UP