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IT21970: IN MQ V5.3.1.11 FOR HP NONSTOP , MQGMO_LOCK HAS BEEN CONFIGURED BUT FAILS TO PREVENT DUPLICATE MESSAGE PROCESSING

A fix is available

WebSphere MQ for HP NonStop Server V5.3.1 fix pack 5.3.1.14

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APAR status

  • Closed as program error.

Error description

  • In MQ v5.3.1.11 for HP NonStop, MQGMO_LOCK has been configured
to prevent duplicate message processing.

Two receivers unexpectedly get same message using mqget with
browse option at same time even though specifying MQGMO_LOCK
option.

Local fix

  • 



Problem summary


    

  • If MQGMO_BROWSE and MQGMO_LOCK are set
and the same message is browsed again, the message will
be  erroneously unlocked, waiters be notified and then
the message locked again. This can lead to the message
being delivered multiple times.

    



Problem conclusion


    

  • The product has been changed in a way
that if the same message is being browsed again with MQGMO_LOCK
being set, it will not be unlocked and waiters will not be
mistakenly notified.

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IT21970
    • 

  • Reported component name
    WEBS MQ NSS ITA
    • 

  • Reported component ID
    5724A3902
    • 

  • Reported release
    531
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2017-08-10
    • 

  • Closed date
    2017-08-11
    • 

  • Last modified date
    2017-08-11
    • 





    

  • 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
    WEBS MQ NSS ITA
    • 

  • Fixed component ID
    5724A3902
    • 



Applicable component levels


    

  • R531  PSY
       UP
    • 








      
              
                            

              

              [{"Line of Business":{"code":"LOB45","label":"Automation"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSFKSJ","label":"WebSphere MQ"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"5.3.1"}]
              

                          

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            28 September 2021
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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