PI37801: THREAD SLEEP IN WLM RULE.ETIQUETTE REGISTERNOTIFICATIONTYPE CAUSES THREAD HANGS WHEN CLUSTER MEMBER DESCRIPTIONS NOT AVAIL

Fixes are available

APAR status

Closed as program error.

Error description

A Thread sleep in WLM RuleEtiquette.registerNotificationType
was causing thread hangs when cluster member descriptions were
not available. Code was changed to skip the wait loop to avoid
thread hangs while descriptions are propagating.

Local fix

```
N/A
```

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server V7.0, V8.0, and V8.5 workload        *
*                  management (WLM)                            *
****************************************************************
* PROBLEM DESCRIPTION: Thread hangs can occur with             *
*                      RuleEtiquette.registerNotificationType  *
*                      on stack                                *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
The WLM rule processing code was waiting asynchronously for
descriptions of members as they are started. Descriptions are
received for these members on the IIOP request response flow.
If the description for a newly started member is not included
in an IIOP response to the client, the thread will sleep in an
attempt to wait for the necessary description. However there
is no other mechanism from which a description can be expected
in this request flow so waiting is of no value and can lead to
a hung thread.

Problem conclusion

A custom property IBM_CLUSTER_HANDLE_DESCRIPTION_WAIT is added
to skip thread sleep processing if no description is received
for the RuleEtiquette to act on. The description will be
processed later as it is included in a future IIOP response.

To define the IBM_CLUSTER_HANDLE_DESCRIPTION_WAIT custom
property for the cell:

1. In the administrative console, select System administration
> Cell > Custom properties > New.
2. Set the property name to IBM_CLUSTER_HANDLE_DESCRIPTION_WAIT
and value to false.
3. Click OK, and save your changes.

The change takes effect the next time that a server is
started.

The fix for this APAR is currently targeted for inclusion in
fix packs 7.0.0.41, 8.0.0.12, and 8.5.5.6.  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
PI37801
Reported component name
WEBS APP SERV N
Reported component ID
5724H8800
Reported release
700
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2015-03-25
Closed date
2015-06-05
Last modified date
2016-11-29

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

R850 PSY
UP

[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"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:
28 April 2022

Tips

PI37801: THREAD SLEEP IN WLM RULE.ETIQUETTE REGISTERNOTIFICATIONTYPE CAUSES THREAD HANGS WHEN CLUSTER MEMBER DESCRIPTIONS NOT AVAIL

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

R850 PSY

Document Information

Share your feedback

Need support?