APAR status |
Closed as program error.
| Error description
Basically, a JVM crash or system failure will make the
requests in certain cases to be routed to another JVM.
The plugin was already handling these failures by
attempting to reroute these requests to other clones
based on a hashing algorithm which would result in
the same clone for different requests. However, if these
retry attempts(3 of them) failed to find a clone which could
serve the request , the WLM algorithm kicked in which would
randomly select a clone.
This could lead to request being
served by multiple jvms concurrently. Local fixProblem summary
****************************************************************
* USERS AFFECTED: All WebSphere Application Server users *
* of Session Affinity. *
****************************************************************
* PROBLEM DESCRIPTION: In failover situations selection of *
* clones when using session affinity *
* is sometimes performed via the round- *
* robin. This causes problems because *
* the same clone is not guaranteed to *
* be selected for subsequent requests *
* with the same session id. This only *
* occurs in failover situations (when *
* the clone that the session has *
* affinity to is unavailable). *
****************************************************************
* RECOMMENDATION: *
****************************************************************
In failover situations selection of clones when using session
affinity is sometimes performed via the round-robin. This
causes problems because the same clone is not guaranteed to be
selected for subsequent requests with the same session id.
This only occurs in failover situations (when the clone that
the session has affinity to is unavailable). Problem conclusion
Modified the clones selection algorithm so that in failover
situations clones will chosen in a predefined order. Temporary fix
session.zip Comments
APAR information | APAR number | PQ51255 | Reported component name | WAS ADVANCED AI | Reported component ID | 5648C8400 | Reported release | 350 | Status | CLOSED PER | PE | NoPE | HIPER | NoHIPER | Submitted date | 2001-08-07 | Closed date | 2001-10-30 | Last modified date | 2001-10-30 |
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:APAR is sysrouted FROM one or more of the following:
Modules/Macros APAR is sysrouted TO one or more of the following:Modules/Macros
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Fix information |
Fixed component name | WAS ADVANCED AI | Fixed component ID | 5648C8400 |
Applicable component levels | R350 PSY | UP |
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