PM23655: IBM WEBSPHERE SERVICE INTEGRATION BUS MESSAGING ENGINE FAILS TO START AFTER A NETWORK CONNECTION IS LOST AND RE-ESTABLISHED

Fixes are available

APAR status

Closed as program error.

Error description

When a database is taken down for maintenance while an
IBM WebSphere Application Server Service Integration Bus
messaging engine is running, the messaging engine loses its
lock on the datastore. When the connection to the database is
re-established , the messaging engine still fails to acquire
lock on the datastore and the following messages are logged
repeatedly in the SystemOut.log:

CWSIS1546I: The messaging engine, ME_UUID={0}, INC_UUID={1},
has lost an existing lock or failed to gain an initial lock
on the data store

CWSIS1538I: The messaging engine, ME_UUID={0}, INC_UUID={1},
is attempting to obtain an exclusive lock on the data store.

Local fix

Restart the server hosting the messaging engine

Problem summary

****************************************************************
* USERS AFFECTED:  Users of the default messaging provider for *
*                  IBM WebSphere Application Server            *
****************************************************************
* PROBLEM DESCRIPTION: The lock on the messaging engine        *
*                      database table is not reacquired even   *
*                      when the lock held by the previous      *
*                      instance of the messaging engine has    *
*                      been removed.                           *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
The messaging engine is not able to acquire a lock on the data
store, and the following messages are output:

CWSIS1546I: The messaging engine, ME_UUID={0}, INC_UUID={1},
has lost an existing lock or failed to gain an initial lock
on the data store

CWSIS1538I: The messaging engine, ME_UUID={0}, INC_UUID={1},
is attempting to obtain an exclusive lock on the data store.

If these messages occur when there is a lock held on the
SIBOWNER table of the data store then this is expected, and the
database will normally remove the lock after a period of time.

If these messages still occur even when the lock no longer
exists, then it is likely that the thread attempting to do the
locking is not running. This can be verified by taking a
javacore of the messaging engine process that is showing the
CWSIS1546I message and looking for a thread named:
sib.LockThread-<ME_UUID>  where <ME_UUID> is the uuid of the
messaging engine with the problem.

The thread stopped running due to a timing window where the
connection to the database was re-established so we could
create a connection but was then lost again before we could
attempt to get a lock.

Problem conclusion

This APAR makes sure that the locking thread is always running
when attempting to acquire the lock on the data store.

The fix for this APAR is currently targeted for inclusion in
fix pack 7.0.0.15.  Please refer to the Recommended Updates
page for delivery information:
http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980

Temporary fix

```
Restart the messaging engine process.
```

Comments

APAR Information

APAR number
PM23655
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
2010-10-01
Closed date
2010-11-26
Last modified date
2010-11-26

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

PM23655: IBM WEBSPHERE SERVICE INTEGRATION BUS MESSAGING ENGINE FAILS TO START AFTER A NETWORK CONNECTION IS LOST AND RE-ESTABLISHED

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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