PH47898: BETTER HANDLING OF CONNECTION ERROR EVENTS ON FREE CONNECTIONS.

APAR status

• Closed as new function.

Error description

• Port Liberty change Better handling of connection error events
  on free connections #19063 to twas.
  (https://github.com/OpenLiberty/open-liberty/pull/19063)
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server                                      *
  *                  using resource adapters with heart beat     *
  *                  connection health checks.                   *
  ****************************************************************
  * PROBLEM DESCRIPTION: When a connection error event occurs    *
  *                      from                                    *
  *                      a heart beat thread, multithreaded      *
  *                      access                                  *
  *                      to the same connection can occur.       *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Multithreaded access to the same connection can cause connection
  pool state to report incorrect total connection count values or
  unexpected behavior while the application is using the
  connection.
  Assuming the heart beat thread checking connection and only
  using
  connection error event on bad connections, it's likely the
  application would have experiences error.   The main focus of
  this
  apar is on the state of the connection pools total connection
  count.
  

Problem conclusion

• The multithreaded access to the connection pool when using
  connection error event has been fixed to handle the heart beat
  connection health check threads that call connection error event
  without knowing the current usage of the connection.
  
  
  
  The fix for this APAR is targeted for inclusion in fix pack
  8.5.5.24 and 9.0.5.15. For more information, see 'Recommended
  Updates for WebSphere Application Server':
  https://www.ibm.com/support/pages/node/715553
  

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

  WEBSPHERE APP S

• Fixed component ID

  5724J0800

Applicable component levels