A fix is available
APAR status
Closed as program error.
Error description
With MONCHL set to LOW, MEDIUM, or HIGH, the DISPLAY CHSTATUS(channel-name) MONITOR command sometimes shows extremely high NETTIME values for channels connecting to a z/OS 9.1.0 queue manager. The problem is more likely to occur with higher volumes of messages. So far, it has been observed with Linux and Windows senders, although it might occur in other environments. The problem does not affect the operation of the channel but does give misleading values for NETTIME. The problem can be recreated with regularity by setting the channel with MONCHL(HIGH) and BATCHSZ(10), putting 60 messages with the channel inactive, and then starting the channel. During periods of low message activity, the NETTIME values look more reasonable. rriConfirmAccept needs a fix similar to the one made by APAR PH13648 in rriConfirm for z/OS sender channels.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All users of IBM MQ for z/OS Version 9 * * Release 1 Modification 0. * **************************************************************** * PROBLEM DESCRIPTION: When a distributed QMGR connects to a * * z/OS QMGR with channel monitoring * * enabled, issuing a DISPLAY CHSTATUS may * * result in unusually high values for the * * NETTIME field. * * * * If the connection instead originates * * from a z/OS QMGR, then the NETTIME * * field may not be updated. * **************************************************************** A sporadic error in the receiver code causes the calculation of the elapsed time to be larger than expected. This in turn results in an elapsed time greater than the total time being returned to the sender side. The distributed QMGR code fails to notice this and subsequently calculates a negative value for the NETTIME, which is interpreted as a large positive number by DISPLAY CHSTATUS.
Problem conclusion
The receiver code has been corrected to calculate the correct value for the elapsed time.
Temporary fix
Comments
APAR Information
APAR number
PH29093
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
2020-09-02
Closed date
2020-09-21
Last modified date
2020-11-02
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI71661
Modules/Macros
CSQXCCAX CSQXREXT CSQXRMRC
Fix information
Fixed component name
IBM MQ Z/OS V9
Fixed component ID
5655MQ900
Applicable component levels
R100 PSY UI71661
UP20/10/13 P F010
Fix is available
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Document Information
Modified date:
03 November 2020