IT40883: PROVIDE OPTION TO CONTROL JAVA DNS CACHING BEHAVIOUR

APAR status

• Closed as new function.

Error description

• By default portions of App Connect Enterprise which make TCP
  connections via Java will cache DNS entries indefinitely. It is
  possible to override this behaviour by setting the
  network.cache.ttl java system property however it would be
  convenient to have a product setting to control this in the
  server.conf.yaml document so that it is encapsulated in the
  Integration Server definition. Additionally, with the prevalence
  of elastically scaled environments the default behaviour to
  cache results indefinitely is no longer desirable.
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  All users of App Connect Enterprise version 11 or 12.
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  By default portions of App Connect Enterprise which make TCP
  connections via Java will cache DNS entries indefinitely. It is
  possible to override this behaviour by setting the
  network.cache.ttl java system property however it would be
  convenient to have a product setting to control this in the
  server.conf.yaml document so that it is encapsulated in the
  Integration Server definition. Additionally, with the prevalence
  of elastically scaled environments the default behaviour to
  cache results indefinitely is no longer desirable.
  

Problem conclusion

• The following property has been added to the JVM Resource
  manager and can be set via the server.conf.yaml file:
  
  #networkaddressCacheTtl: 60      # Default DNS cache timeout,
  applied to both networkaddress.cache.ttl and
                                                        #
  sun.net.inetaddr.ttl unless either are already set.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v11.0      11.0.0.24
  v12.0      12.0.5.0
  
  The latest available maintenance can be obtained from:
  http://www-01.ibm.com/support/docview.wss?rs=849&uid=swg27006041
  
  If the maintenance level is not yet available,information on
  its planned availability can be found on:
  http://www-1.ibm.com/support/docview.wss?rs=849&uid=swg27006308
  ---------------------------------------------------------------
  

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:

Fix information

• Fixed component name

  APP CONNECT ENT

• Fixed component ID

  5724J0550

Applicable component levels