PM56984: MDB on remote servant cannot consume any Best effort non persistent messages in ZOS.

Fixes are available

APAR status

Closed as program error.

Error description

If consumer application (e.g MDB) is running on different
application server than the Messaging Engine (ME), MDB cannot
consume  &#65442;&#65506;&#65410;&#65452; &#65427;Best effort nonpersistent" messges in ZOS platfor
Remote servant region (where consumer application deployed)
throws the following exception during message consumption:

[3/2/12 9:21:39:461 GMT] 0000000c SibRaDispatch 1
(com.ibm.ws.sib.ra.inbound.impl.SibRaDispatchEndpointActivation)
 [:/8b408b4] Tracing exception:
com.ibm.ws.sib.comms.common.CommsByteBuffer$CommsSIMessageNotLoc
kedException: CWSIC8007E: An exception was caught from the
remote server with Probe Id 3-025-0010. Exception: CWSIP0173E:
Unable to locate message [<system message ID>] on destination
<queue name> on messaging engine <ME name>.
 at
com.ibm.ws.sib.comms.common.CommsByteBuffer.parseSingleException
(CommsByteBuffer.java:1866)
 at
com.ibm.ws.sib.comms.common.CommsByteBuffer.getException(CommsBy
teBuffer.java:1263)
 at
com.ibm.ws.sib.comms.common.JFAPCommunicator.checkFor_SIMessageN
otLockedException(JFAPCommunicator.java:1526)
 at
com.ibm.ws.sib.comms.client.BifurcatedConsumerSessionProxy._read
AndDeleteSet(BifurcatedConsumerSessionProxy.java:521)
 at
com.ibm.ws.sib.comms.client.BifurcatedConsumerSessionProxy.readA
ndDeleteSet(BifurcatedConsumerSessionProxy.java:439)
 at
com.ibm.ws.sib.ra.inbound.impl.SibRaDispatchEndpointActivation.d
ispatch(SibRaDispatchEndpointActivation.java:277)
 at
com.ibm.ws.sib.ra.inbound.impl.SibRaDispatchTarget.dispatch(SibR
aDispatchTarget.java:94)
..
..

Mssages other than "Best effort nonpersistent" Quality of
Service(QoS) can be consumed by remote consumer application
without any problem in ZOS.

Local fix

```
n/a
```

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server z/OS V7.0 and V8.0                   *
****************************************************************
* PROBLEM DESCRIPTION: None of the Best Effort Non             *
*                      Persistent(BENP) messages are           *
*                      consumed by remotely deployed consumer  *
*                      application in z/OS.                    *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
In z/OS, consumer applications are running on the "servant"
region and Messaging Engine (ME) is running on the "adjunct"
region. When consumer application deployed on the remote
application server which is remote to the ME (e.g ME is
running on "adjunct" region on server1 and MDB is running on
"servant" region of server2), the ME delivered the BENP message
to the remote consumer and deleted the message. The remote
"servant" region (where consumer runs) initially gets the token
which is the representation of original message. During message
consumption, remote "servant" attempted to connect to the local
ME to obtain the message (for the token). This lead to
CWSIP0173E error, as the local ME has already deleted BENP
messages.
The fix is to keep BENP messages on the ME until consumed by
the remote consumer application deployed on the remote
"servant" region. Some times messages can be discarded from
the heap before message consumption if there is a garbage
collection request. But this is fine, because as per design it
is expected to lose some BENP messages. This fix only ensures
that we do not lose all the BENP messages when consumer
application is remote to the ME in z/OS.

Problem conclusion

Source code has been modified to retain BENP messages on the
ME until message consumption hence we don't lose all
the BENP messages in z/OS.

APAR PM56984 is currently targeted for inclusion in Fix Pack
7.0.0.25 of WebSphere Application Server V7.0 and Fix Pack
8.0.0.4 of WebSphere Application Server V8.0.

Please refer to URL:
//www.ibm.com/support/docview.wss?rs=404&uid=swg27006970
for Fix Pack availability.

Temporary fix

Fix 1:

Add ME on the remote adjunct region which is local to the
servant region where consumer application is deployed.

Fix 2"

Increase the QoS of the message from BE NP to Reliable Non
Persistent or higher.

Comments

APAR Information

APAR number
PM56984
Reported component name
WEBSPHERE FOR Z
Reported component ID
5655I3500
Reported release
700
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2012-01-30
Closed date
2012-04-18
Last modified date
2012-11-02

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 FOR Z
Fixed component ID
5655I3500

Applicable component levels

R700 PSY UK81738
UP12/10/04 P F210

Fix is available

Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.

[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SS7K4U","label":"WebSphere Application Server for z\/OS"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"7.0","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
28 October 2021

Tips

PM56984: MDB on remote servant cannot consume any Best effort non persistent messages in ZOS.

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 UK81738

Fix is available

Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.

Document Information

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