APAR status
Closed as program error.
Error description
IBM MQ incorrectly writes channel completion messages with an MQMD format of MQCHCOM to SYSTEM.CHANNEL.INITQ when SVRCONN channels end. These extraneous messages can lead to an increase of CURDEPTH on the SYSTEM.CHANNEL.INITQ which may inhibit the channel initiator from performing its scheduled tasks in a timely manner. Under extreme circumstances, the initiation queue may fill preventing new trigger messages from being queued. The queue manager error log may contain AMQ7208 error entries indicating that the channel initiation queue is full (MQRC_Q_FULL).
Local fix
Problem summary
**************************************************************** USERS AFFECTED: Any users that connect clients to a queue manager could generate unnecessary channel completion messages for SVRCONN channels when the client connections are closed. Whether the extraneous messages have a noticeable impact on the normal operation of the channel initiator (channel triggering, channel retry and healthchecking) will depend upon the number of connections closures and the existing workload on the channel initiator. Platforms affected: MultiPlatform **************************************************************** PROBLEM DESCRIPTION: When a channel agent terminates, it performs a check to see if a channel initiator will be scheduled to wake in time to perform a channel retry, it may also produce a channel stopped event if configured - this process is unnecessary for SVRCONN channel agents.
Problem conclusion
The logic in channel termination was corrected to the expected behaviour for SVRCONN channel agents. --------------------------------------------------------------- The fix is targeted for delivery in the following PTFs: Version Maintenance Level v8.0 8.0.0.13 v9.0 LTS 9.0.0.8 v9.1 CD 9.1.3 v9.1 LTS 9.1.0.3 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
IT28243
Reported component name
IBM MQ BASE MP
Reported component ID
5724H7251
Reported release
800
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2019-02-27
Closed date
2019-05-17
Last modified date
2019-05-17
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 MP
Fixed component ID
5724H7251
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":"8.0.0.0","Edition":"","Line of Business":{"code":"LOB45","label":"Automation"}}]
Document Information
Modified date:
17 May 2019