IP23572: CONNECTION MANAGER DOES NOT SUPPORT MULTIPLE LISTENER THREADS ON A SINGLE DBSERVERNAME OR DBSERVERALIASES PORT

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APAR status

  • Closed as program error.

Error description

  • Informix Dynamic Server allows for startup of multiple listener
    threads on a single dbserver port through adding a "-<number>"
    flag to the server name in the onconfig file's DBSERVERNAME and
    DBSERVERALIASES parameters.  For example:
    
    DBSERVERALIASES informix1-2,informix2-2,informix3
    
    In this example, 2 listener threads would be started on the
    informix1 and informix2 dbserver aliases, while only a single
    listener thread would be started on the informix3 alias.
    
    Connection Manager does not currently support this
    configuration.  This can result in messages in the Connection
    Manager log indicating registration issues such as "<CM name> is
    already registered" upon Connection Manager startup.
    Alternately, an onstat -g cmsm can show multiple clusters that
    include a cluster named 'main' associated with the CM, when no
    'main' cluster is defined in the Connection Manager
    configuration.
    
    It appears that when multiple listener threads are started on
    the database server, Connection Manager will add a cluster for
    each listener thread, even if those additional clusters are not
    defined in the configuration.  However, this may cause some
    stability issues with the connections to the server under heavy
    load.
    

Local fix

  • The current workaround for this limitation is to start up only a
    single listener thread on each database server port.
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * Connection Manager connects to IDS with multiple listeners   *
    * enabled                                                      *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Update to CSDK-4.10.xC2                                      *
    ****************************************************************
    

Problem conclusion

  • Problem Fixed In CSDK-4.10.xC2
    

Temporary fix

Comments

APAR Information

  • APAR number

    IP23572

  • Reported component name

    CONNECTION MANA

  • Reported component ID

    5724C2382

  • Reported release

    410

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-07-31

  • Closed date

    2014-02-26

  • Last modified date

    2014-02-26

  • 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

    CONNECTION MANA

  • Fixed component ID

    5724C2382

Applicable component levels

  • R370 PSY

       UP

  • R410 PSY

       UP



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Document information


More support for:

Informix Tools
Informix Client Software Development Kit (CSDK)

Software version:

410

Reference #:

IP23572

Modified date:

2014-02-26

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