IT41852: STARTING 1000 USER APPLICATION PROCESSES SIMULTANEOUSLY GENERATES FDCS WITH ZRCC_E_ZCG_SERVER_CONNECTIONS_EXHAUSTED

APAR status

• Closed as program error.

Error description

• Under rare, high load scenarios, when a very large number of
  applications simultaneously connect to the queue manager, the
  EC may temporarily exhaust its internal connection pool.When
  this happens the EC rejects the connection causing the MQ
  application to issue an FDC with
  zrcC_E_ZCG_SERVER_CONNECTIONS_EXHAUSTED. The MQCONN is rejected
  with reason code MQRC_UNEXPECTED_ERROR (2195). Retrying the
  connection succeeds.
  

Local fix

• The condition is temporary so retrying the application
  connection (MQCONN) to the queue manager will succeed.
  

Problem summary

• The EC's internal connection pool was set to 1000 and in very
  rare situations, this is not enough.
  

Problem conclusion

• The EC's internal connection pool size is increased to a higher
  value.
  

Temporary fix

• The condition is temporary so retrying the application
  connection (MQCONN) to the queue manager will succeed.
  

Comments

APAR Information

• 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

  MQ FOR HPE NS O

• Fixed component ID

  5724A3904

Applicable component levels