APAR status
Closed as program error.
Error description
A Clean Session Record message which contains only a client ID is put to the SYSTEM.MQTT.PERSISTENT.STATE queue every time a MQTT client connects and requests a clean session. This Clean Session Record message should get removed from the queue when either the client disconnects or during a client takeover. However, this message was not removed during a client takeover, leading to a buildup of messages on the SYSTEM.MQTT.PERSISTENT.STATE queue.
Local fix
NA
Problem summary
**************************************************************** USERS AFFECTED: This issue affects MQTT Clients connecting with same client ID as an existing connected MQTT client, and also specifying clean session true in the connect options. Platforms affected: MultiPlatform **************************************************************** PROBLEM DESCRIPTION: MQTT Client takeover is a situation in which a MQTT client connects to the MQXR service, specifying the same client ID as a client that is already connected. If the original client connected specifying clean session true, it would have put a clean session record message to the SYSTEM.MQTT.PERSISTENT.STATE queue. The new client taking over this client's session did not remove the previous client's clean session record message from the SYSTEM.MQTT.PERSISTENT.STATE queue before putting its own message, leading to a buildup of these messages on that queue.
Problem conclusion
This fix ensures that during a MQTT client takeover, the previous client's clean session record is deleted and the clean session record from the newly connected client is saved to the SYSTEM.MQTT.PERSISTENT.STATE queue. --------------------------------------------------------------- The fix is targeted for delivery in the following PTFs: Version Maintenance Level v9.0 LTS 9.0.0.6 v9.1 LTS 9.1.0.2 The latest available maintenance can be obtained from 'WebSphere MQ Recommended Fixes' http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037 If the maintenance level is not yet available information on its planned availability can be found in 'WebSphere MQ Planned Maintenance Release Dates' http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309 ---------------------------------------------------------------
Temporary fix
Comments
APAR Information
APAR number
IT25290
Reported component name
IBM MQ BASE M/P
Reported component ID
5724H7261
Reported release
900
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2018-06-06
Closed date
2018-09-27
Last modified date
2018-09-27
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
IBM MQ BASE M/P
Fixed component ID
5724H7261
Applicable component levels
[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSYHRD","label":"IBM MQ"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"9.0","Edition":"","Line of Business":{"code":"LOB45","label":"Automation"}}]
Document Information
Modified date:
27 September 2018