PH59514: UNDER SOME CONDITIONS, NOT ALL THE PERSISTENCY SUBSCRIPTIONS CAN AUTO-RESTART SUCCESSFUL AT THEIR FIRST ATTEMPT.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• When a large number of persistent subscriptions are configured
  with the same CDC target engine, the auto-restart for all of the
  persistence subscriptions would trigger many connection requests
  instantaneously, which may exceed the size of the connection
  accept queue for the target TCP/IP stack and cause some of the
  connection requests to be dropped.When such a situation occurs,
  the source engine issues the messages, CHC6455E from CMO task
  and CHC9694W from SCT task, several minutes after the CHC0220I
  message for the same subscription's SCT task is seen.
  

Local fix

• No local fix is available.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users of InfoSphere Change Data Capture      *
  *                 for z/OS                                     *
  ****************************************************************
  * PROBLEM DESCRIPTION: When a large number of persistent       *
  *                      subscriptions are configured with the   *
  *                      same CDC target engine, the             *
  *                      auto-restart for all of the persistent  *
  *                      subscriptions would trigger many        *
  *                      connection requests instantaneously,    *
  *                      which may exceed the size of the        *
  *                      connection accept queue for the target  *
  *                      TCP/IP stack and cause some of the      *
  *                      connection requests to be dropped.When  *
  *                      such a situation occurs, the source     *
  *                      engine issues the messages, CHC6455E    *
  *                      from CMO task and CHC9694W from SCT     *
  *                      task, several minutes after the         *
  *                      CHC0220I message for the same           *
  *                      subscription's SCT task is seen.        *
  ****************************************************************
  Under some conditions, not all the persistent subscriptions can
  auto-restart successfully on their first attempt.
  

Problem conclusion

• A mechanism for pacing the startup 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:

  UI96277

Modules/Macros

• CHCDSCDB CHCDSCIQ CHCDSCPF CHCDSCUT CHCOSCIQ CHCPAAUT
  

Fix information

• Fixed component name

  INFO SRVR CDC Z

• Fixed component ID

  5655U7600

Applicable component levels

• RA21 PSY UI96277

     UP24/04/05 P F404

Fix is available

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