PK99225: DURING A FAILOVER THAT INVOLVES A CONVERGED APPLICATION, THE HTTP PROXY MAY SEND HTTP REQUESTS TO SERVERS THAT DON'T OWN THEM

Fixes are available

APAR status

Closed as program error.

Error description

During failover of a converged application (SIP/HTTP), HTTP
requests may get sent to servers in the cluster that may not own
them.  There is a small timing window that exists in which the
sessions affinity id (logical server name) is not able to be
looked up which causes the HTTP proxy to just send them to any
server in the cluster.  For a converged application these need
to be sent to the failed server's peer replica server which
owns all the failed sessions.

Local fix

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server that have deployed a converged       *
*                  Hypertext Transfer Protocol (HTTP) /        *
*                  Session Initiation Protocol (SIP)           *
*                  application into a high availability        *
*                  cluster.                                    *
****************************************************************
* PROBLEM DESCRIPTION: During a failover, the HTTP proxy       *
*                      could send an HTTP request to the       *
*                      incorrect Application Server.           *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
The HTTP proxy does not have currently have a way to look for
this failover event. If the lookup of the HTTP session id
fails, the HTTP proxy will route the HTTP request to any server
in the cluster.  Not necessarily to the peer replica server for
the failed server.

Problem conclusion

A new HTTP proxy filter was created to look for this
failover event and "pause" HTTP requests when the lookup of
the HTTP session id will fail.  This filter will "resume"
these HTTP requests when the lookup of this HTTP session id
will succeed and forward the HTTP request to the correct
application server.   This filter is only applicable for when
the WebSphere Proxy server is configured for both SIP and HTTP.

The fix for this APAR is currently targeted for inclusion in
fix pack 7.0.0.9.  Please refer to the Recommended Updates
page for delivery information:
http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980

Temporary fix

Comments

APAR Information

APAR number
PK99225
Reported component name
WEBS APP SERV N
Reported component ID
5724H8800
Reported release
700
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2009-10-21
Closed date
2009-11-11
Last modified date
2009-11-11

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
WEBS APP SERV N
Fixed component ID
5724H8800

Applicable component levels

R700 PSY
UP

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSEQTP","label":"WebSphere Application Server"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"7.0","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
24 October 2021

Tips

PK99225: DURING A FAILOVER THAT INVOLVES A CONVERGED APPLICATION, THE HTTP PROXY MAY SEND HTTP REQUESTS TO SERVERS THAT DON'T OWN THEM

Fixes are available

Subscribe

APAR status

Closed as program error.

Error description

Local fix

Problem summary

Problem conclusion

Temporary fix

Comments

APAR Information

APAR number

Reported component name

Reported component ID

Reported release

Status

PE

HIPER

Special Attention

Submitted date

Closed date

Last modified date

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

Fixed component ID

Applicable component levels

R700 PSY

Document Information

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