A fix is available
APAR status
Closed as program error.
Error description
Queue service interval high events are getting generated more frequently after maintenance was applied. If multiple getters are checking for service interval high events at the same time, it is possible for the sequence of processing on two threads to result in a negative service interval being calculated. Because a negative interval is not expected, it is interpreted as a very large interval which exceeds the service interval threshold defined on the queue, so a service interval high event is issued. . Additional keywords: QSVCINT QSVCIEV HIGH SYSTEM.ADMIN.PERFM.EVENT MQRC_Q_SERVICE_INTERVAL_HIGH
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All users of IBM MQ for z/OS Version 9 * * Release 1 Modification 0. * **************************************************************** * PROBLEM DESCRIPTION: Frequent queue service interval high * * events may be produced when multiple * * applications are serving messages on * * the same queue. * **************************************************************** With performance events enabled, and an appropriate high service interval set on the queue. When multiple applications are servicing messages on the queue, if multiple gets occur within a short period of time, CSQMIAGM may wait for the object latch for the queue. However this may result in the calculation for elapsed time to return a negative value into an unsigned value. This results in the service interval high performance events being produced more frequently than expected.
Problem conclusion
The processing has been altered to correctly calculate the time used prior to issuing the events to correctly deal with multiple getters waiting on the same object latch.
Temporary fix
Comments
APAR Information
APAR number
PH03169
Reported component name
IBM MQ Z/OS V9
Reported component ID
5655MQ900
Reported release
100
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2018-09-24
Closed date
2019-01-30
Last modified date
2019-03-01
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI61009
Modules/Macros
CSQMIAGM
Fix information
Fixed component name
IBM MQ Z/OS V9
Fixed component ID
5655MQ900
Applicable component levels
R100 PSY UI61009
UP19/02/28 P F902
Fix is available
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Document Information
Modified date:
01 March 2019