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PH20952: FFST errors with ProbeIDs 21 and 31 when all cluster full repositories are demoted.

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APAR status

  • Closed as program error.

Error description

  • When all Full Repositories for a given cluster name are demoted,
the partial repository queue managers began to generate failure
data capture (FDC) records with one or both of the following
errors:

******
Probe Id     :- RM702021
Component     :- rrmCheckSubsForQMgr
Comment1     :- Missing subscription
MQM Function Stack
amqrrfma_main
rrmMain
rrmRepository
rrmGetMsg
rrmRunTimers
rrmMaintenance
rfxEnumCLQMGR
rrmMaintainClqMgr
rrmCheckSubsForQMgr
xcsFFST
******

******
Probe Id     :- RM883031
Component     :- rrmCheckSubsForQueue
MQM Function Stack
amqrrfma_main
rrmMain
rrmRepository
rrmGetMsg
rrmRunTimers
rrmMaintenance
rfxEnumCLQ
rrmMaintainClq
rrmCheckSubsForQueue
xcsFFST
******

Local fix

  •

Problem summary

  • ****************************************************************
* USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
*                 Release 0 Modification 0 and Release 1       *
*                 Modification 0.                              *
****************************************************************
* PROBLEM DESCRIPTION: FFST errors with ProbeIDs 21 and 31     *
*                      when all cluster full repositories are  *
*                      demoted.                                *
****************************************************************
In this case, the FDC records were written by code running on an
internal schedule in the cluster repository manager process.
The code that is checking that proper subscription records exist
internally within the clustering component of the queue manager.

The FDC is a "false positive".  That is, there is no problem.

The reason the FDC appears is that no subscriptions exist for a
particular queue or queue manager object, in the particular
cluster for which there are now no Full Repositories.

However, the fact there are no Full Repositories for that
cluster means it is valid that there are no subscriptions.

Problem conclusion

  • The MQ code has been corrected so that the subscriptions
validity check on a  Partial Repository is only performed for a
cluster in which there is at least one Full Repository known.
This then means that, in the scenario described in this APAR,
the FFSTs are no longer written.

This APAR is a route of IT31028.

Temporary fix

  •

Comments

  •

APAR Information

  • APAR number

    PH20952

  • Reported component name

    IBM MQ Z/OS V9

  • Reported component ID

    5655MQ900

  • Reported release

    000

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2020-01-13

  • Closed date

    2020-10-20

  • Last modified date

    2021-01-04

  • APAR is sysrouted FROM one or more of the following:

    IT31028

  • APAR is sysrouted TO one or more of the following:

    UI72153 UI72154

Modules/Macros

  • CMQXRECO CMQXRMNT

Fix information

  • Fixed component name

    IBM MQ Z/OS V9

  • Fixed component ID

    5655MQ900

Applicable component levels

  • R000 PSY UI72154

       UP20/12/07 P F012

  • R100 PSY UI72153

       UP20/12/07 P F012

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.

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Document Information

Modified date:
27 March 2021

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