PI58800: High CPU utilization can occur for WebSocket sessions that expir e using a non-default MaxIdleTimeout value

Fixes are available

APAR status

Closed as program error.

Error description

Remove session timeout timer for all connection close paths

Local fix

Problem summary

****************************************************************
* USERS AFFECTED:  IBM WebSphere Application Server Liberty    *
*                  V8.5.5 users of WebSockets                  *
****************************************************************
* PROBLEM DESCRIPTION: High CPU utilization can occur for      *
*                      WebSocket sessions that expire using a  *
*                      non-default MaxIdleTimeout value        *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
When the non-default value (default is no timeout) is used for a
WebSocket Session MaxIdleTimeout, in some cases an internal
session timer object may not be removed if the session is closed
due to the timeout expiring.  If this happens to enough
sessions, then the accumulating timer objects can cause the CPU
to periodically spike.

Problem conclusion

WebSocket connection Timers are now always removed when the
connection is closed due to the timer expiring.

The fix for this APAR is currently targeted for inclusion in fix
pack 16.0.0.2.  Please refer to the Recommended Updates page for
delivery information:
http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980

Temporary fix

Do not set a value for the Session MaxIdleTimeout.  The default
is to not have a value set for this parameter.

Comments

APAR Information

APAR number
PI58800
Reported component name
WAS LIBERTY COR
Reported component ID
5725L2900
Reported release
855
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2016-03-09
Closed date
2016-05-04
Last modified date
2016-06-13

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 LIBERTY COR
Fixed component ID
5725L2900

Applicable component levels

R855 PSY
UP

[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSD28V","label":"WebSphere Application Server Liberty Core"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"855","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
04 May 2022

Tips

PI58800: High CPU utilization can occur for WebSocket sessions that expir e using a non-default MaxIdleTimeout value

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

R855 PSY

Document Information

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