PH30152: PERFORMANCE DEGRADATION DUE TO LOCK CONTENTION WITH UCDWEBAPPCLASSLOADER

APAR status

• Closed as program error.

Error description

• Switching tabs and performing other actions in the web UI will
  take significantly longer when the server is under heavy load.
  The thread dumps will contain entries like:
  
  Owns Monitor Lock on
  com/urbancode/container/tomcat/UCDWebappClassLoader@0x0000000800
  82BD20,
  com/urbancode/ds/plugin/automation/AutomationPluginMigratorLooku
  p@0x000000080A9E0F80
  
  Waiting for Monitor Lock on
  com/urbancode/container/tomcat/UCDWebappClassLoader@0x0000000800
  82BD20
  

Local fix

• Remove UCDWebappClassLoader from server.xml and use the default
  class loader, which is parallel capable.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All end users on all supported browsers.                     *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * Switching tabs and performing other actions in the web UI    *
  * will                                                         *
  * take significantly longer when the server is under heavy     *
  * load.                                                        *
  * The thread dumps will contain entries like:                  *
  *                                                              *
  * Owns Monitor Lock on                                         *
  * com/urbancode/container/tomcat/UCDWebappClassLoader@0x000000 *
  * 0800                                                         *
  * 82BD20,                                                      *
  * com/urbancode/ds/plugin/automation/AutomationPluginMigratorL *
  * ooku                                                         *
  * p@0x000000080A9E0F80                                         *
  *                                                              *
  * Waiting for Monitor Lock on                                  *
  * com/urbancode/container/tomcat/UCDWebappClassLoader@0x000000 *
  * 0800                                                         *
  * 82BD20                                                       *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Fixed in version 7.1.1.1                                     *
  ****************************************************************
  

Problem conclusion

• Fix is provided in IBM UrbanCode Deploy 7.1.1.1
  

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

  UC DEPLOY

• Fixed component ID

  5725M5400

Applicable component levels