PI67532: OPTIMIZE CONNECTION POOL BEHAVIOR WHEN THE FREE POOL DISTRIBUTION TABLE SIZE IS SET TO ONE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Default behavior in most cases calls for a connection pool to
  hit it's max connections before attempting to reuse and
  re-authenticate over existing matching connections.  This
  avoids the overhead of searching the multiple hash tables that
  organize the connections and prepping the connection for reuse.
  But, when the free pool distribution table size is set to one,
  this searching is not a concern and the overhead is mitigated
  making it reasonable to reuse first, whenever possible, which
  has the added benefit of a reduced memory foot print to handle
  a given workload.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server V7.0 using connection factories      *
  *                  that support reathentication                *
  ****************************************************************
  * PROBLEM DESCRIPTION: Connection pool hits it's max           *
  *                      connections before attempting to reuse  *
  *                      re-authenticateable connections.        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Connection pool reaches max connections for
  re-authenticateable connection factories even when not under
  load.
  

Problem conclusion

• The connection pool with re-authenticateable connection
  factories will maintain fewer connections in the connection
  pool when not under a load.
  
  APAR PI67532 is currently targeted for inclusion in Fix Pack
  7.0.0.43 of WebSphere Application Server V7.0.
  
  Please refer to the Recommended Updates page for delivery
  information:
  http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
  
  In addition, please refer to URL:
  http://www.ibm.com/support/docview.wss?rs=404&uid=swg27006970
  for Fix Pack PTF information.
  

Temporary fix

Comments

APAR Information

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

  PI61989

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

Fix information

• Fixed component name

  WEBSPHERE FOR Z

• Fixed component ID

  5655I3500

Applicable component levels

• R700 PSY UI46199

     UP17/04/24 P F704

Fix is available

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