PM10591: FILESTORE NEVER RECOVERS FROM OBJECTSTOREFULLEXCEPTION (CWSOM1042E)

Fixes are available

APAR status

Closed as program error.

Error description

When using WebSphere Application Server Service Integration Bus
with a filestore, if the store becomes full
(ObjectStoreFullException CWSOM1042E), no more messages can
ever be sent.  Even consuming every message on the messaging
engine will not allow more messages to be sent because
ObjectStoreFullException is still thrown despite the store
being effectively empty.

Local fix

Problem summary

****************************************************************
* USERS AFFECTED:  Users of the default messaging provider     *
*                  for IBM WebSphere Application Server        *
*                  Version 6.1 and Version 7.0                 *
****************************************************************
* PROBLEM DESCRIPTION: If the filestore becomes full           *
*                      (CWSOM1042E), no more messages can      *
*                      ever be sent even if all existing       *
*                      messages are consumed.                  *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
The problem is caused by a programming error in an
algorithm that determines if the store is full.  Once the
store becomes full the programming error means that even if
all messages are consumed (so the store is effectively empty)
the algorithm still reports that the store is full.

Problem conclusion

This APAR fixes the problem by correcting the programming
error to ensure that if enough free space exists after some
messages have been consumed, the algorithm correctly
determines that the store is no longer full.

Even with the corrected algorithm, once the store has become
full it can only become not full again after a checkpoint
of the Log file has been completed.
The checkpoint reconciles all message sends and receives since
the last checkpoint, and might take some time to complete.

The fix for this APAR also introduces a messaging engine
custom property to control how likely the messaging engine is
to throw exceptions to applications while recovering from a
full store:

sib.msgstore.storeFullWaitForCheckPoint

If the property is 'false', an application thread attempting
to send a message when the store is full will request that a
checkpoint is performed, and then immediately throw a
ObjectStoreFullException to the application.

If the property is 'true', the thread will request a
checkpoint and wait until it has completed before returning.
If the checkpoint has been able to free space in the store,
then the thread can proceed and send messages.  However, if
after the checkpoint the store is still full, the thread will
still get ObjectStoreFullException.

The default value of this property is 'false'.

The primary case where a user might choose to set this
property to 'true', is when applications logically know that
the store is no longer full because it has deleted all
messages, and requires that a subsequent attempt to
send a message will succeed. With the default value of
'false', these applications might still receive exceptions
(and need to retry the send) while the checkpoint completes

The fix for this APAR is currently targeted for inclusion in
fix pack 6.1.0.33 and 7.0.0.13.  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
PM10591
Reported component name
PLAT MSG COM
Reported component ID
620600101
Reported release
200
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2010-03-23
Closed date
2010-04-29
Last modified date
2010-05-04

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
PLAT MSG COM
Fixed component ID
620600101

Applicable component levels

R200 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

PM10591: FILESTORE NEVER RECOVERS FROM OBJECTSTOREFULLEXCEPTION (CWSOM1042E)

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

R200 PSY

Document Information

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