PH60692: WHEN THE IIDR TARGET TERMINATES UNEXPECTANLY, NOT ALL PERSISTENTSUBSRIPTIONS CAN AUTO-RESTART SUCCESSFULLY ON FIRST ATTEMPT

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• When the IIDR target engine terminates unexpectedly a high
  number of persistent subscriptions from the same source system,
  the subscription auto-restart feature may require multiple
  attempts because the size of the connection accept queue for the
   target TCP/IP stack is saturated and rejects any other
  connection requests. In such a situation, the messages CHC6455E
  and CHC9694W are issued after the messages CHC0055I, CHC0057I
  and CHC0056I.
  

Local fix

• Reduce the number of persistent subscriptions for the same IIDR
  target
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users of IIDR CDC for DB2 for z/OS.          *
  ****************************************************************
  * PROBLEM DESCRIPTION: When the IIDR target engine terminates  *
  *                      unexpectedly a high number of           *
  *                      persistent subscriptions from the same  *
  *                      source system, the subscription         *
  *                      auto-restart feature may require        *
  *                      multiple attempts because the size of   *
  *                      the connection accept queue for the     *
  *                      target TCP/IP stack is saturated and    *
  *                      rejects any other connection requests.  *
  *                      In such a situation, the messages       *
  *                      CHC6455E and CHC9694W are issued after  *
  *                      the messages CHC0055I, CHC0057I and     *
  *                      CHC0056I.                               *
  ****************************************************************
  In certain conditions, when the IIDR target engine terminates
  unexpectedly and then is recovered during the subscription
  auto-restart interval, not all persistent subscriptions can
  auto-restart successfully on their first attempt.
  

Problem conclusion

• A mechanism for pacing the auto-restart feature of a group of
  subscriptions simultaneously is implemented.
  

Temporary fix

Comments

APAR Information

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

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

  UI97283

Modules/Macros

• CHCDSCPF CHCOSCIQ
  

Fix information

• Fixed component name

  INFO SRVR CDC Z

• Fixed component ID

  5655U7600

Applicable component levels

• RA21 PSY UI97283

     UP24/06/18 P F406

Fix is available

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