PI30994: OVERLAPPING URIS IN A SINGLE ODR WORKCLASS CAN CAUSE THE ODR TO SELECT THE WRONG COOKIE WHEN ATTEMPTING TO HONOR SERVERAFFINITY

8.5.5.5: WebSphere Application Server V8.5.5 Fix Pack 5
IBM WebSphere Virtual Enterprise Version 7.0 Fix Pack 6, also known as Version 7.0.0.6 is available for download.
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Copy of: 8.5.5.14: WebSphere Application Server V8.5.5 Fix Pack 14
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8.5.5.21: WebSphere Application Server V8.5.5.21

APAR status

• Closed as program error.

Error description

• When there overlapping Uniform Resource Identifiers (URIs) in a
  single On Demand Router (ODR) workclass routing to multiple
  Generic Server Clusters (GSCs) it is possible that the wrong
  session cookie will be used when attempting to honor session
  affinity.  This is especially problematic when
  RulesOverAffinity is set in which case a difference in the
  rules cluster and the presumed affinity cluster (using the
  wrong cookie) will result in the ODR breaking session affinity.
  

Local fix

• No workaround
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  Any user of Generic Server Clusters with    *
  *                  multiple over-lapping URIs within a single  *
  *                  workclass that require session affinity.    *
  ****************************************************************
  * PROBLEM DESCRIPTION: Overlapping URIs result in multiple     *
  *                      JSESSIONID cookies. The wrong cookie    *
  *                      is sometimes selected breaking server   *
  *                      affinity.                               *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When using GSCs with mutltiple overlapping URIs in a single
  workclass using ODR rules to enforce session affinity can
  sometimes result in broken sessions. This is because multiple
  JSESSIONID cookies are included in the request and the
  previous ODR processing simply looked for any JSESSIONID
  cookie if one was present and used the first one found. The
  code has been changed so that the ODR prefers a cookie
  associated with the target GSC cluster over other cookies
  present on the request.
  

Problem conclusion

• Corrected the ODR logic to give preference to cookies for the
  target GSC based upon the rules present in the ODR.  This fix
  is being delivered in WVE 7.0.0.6 and WAS 8.5.5.5.
  

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

  WAS VIRTUAL ENT

• Fixed component ID

  5725C9203

Applicable component levels

• R700 PSY

     UP