PM01066: DYNACACHE DATA CORRUPTION UNDER HIGH CONCURRENCY CONDITIONS WHEN DISK CACHING IS ENABLED.

Fixes are available

APAR status

Closed as program error.

Error description

Dynacache data corruption under high concurrency conditions when
disk caching is enabled.

WebSphere Application Server V6.1.
Distributed Operating Systems.

Local fix

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server V7.0 using the disk offload feature  *
*                  of dynacache.                               *
****************************************************************
* PROBLEM DESCRIPTION: An incorrect object is being returned   *
*                      on a distributed map (DMAP) get         *
*                      invocation when cache entries have      *
*                      been offloaded to disk.                 *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
In a high-load, concurrent environment a low-level get method
in dynacache lack synchronization.  When multiple threads
accessed a get function concurrently it was possible a thread
would receive the object intended for another thread.

Problem conclusion

Synchronization has been added to a low-level get method in
dynacache when disk offload has been enabled.

The fix for this APAR is currently targeted for inclusion in
fix pack 7.0.0.11.  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
PM01066
Reported component name
WEBSPHERE APP S
Reported component ID
5724J0800
Reported release
61A
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2009-11-12
Closed date
2010-03-23
Last modified date
2010-03-23

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
WEBSPHERE APP S
Fixed component ID
5724J0800

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":"6.1","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
24 October 2021

Tips

PM01066: DYNACACHE DATA CORRUPTION UNDER HIGH CONCURRENCY CONDITIONS WHEN DISK CACHING IS ENABLED.

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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