PI44121: A long timeout can occur when connections to all catalog server endpoints time out on a client connection.

APAR status

• Closed as program error.

Error description

• If all catalog server endpoints result in a timeout during a
  client connect, the overall timeout before the client receives a
  connection is longer in WebSphere eXtreme Scale Server V8.6.0.6
  and later than it was in WebSphere eXtreme Scale Server
  8.6.0.5. For example, when the defaults are used for JVM
  arguments,
  com.ibm.websphere.xs.determine.transport.timeout and
  com.ibm.websphere.xs.determine.transport.attempts, then the time
  that an exception occurs can go to 90 seconds instead of 30
  seconds.
  
  See the following example messages when the timeout takes 90 or
  more seconds, where the CWOBJ0210W lists "Probe returned null"
  instead of a communication exception.
  
  CWOBJ0204I: The transport type of this Client JVM is
  being determined by contacting the catalog service domain with
  the catalog service endpoints of: myHost:2809.
  
  CWOBJ0210W: The transport type of the remote server
  on myHost:2809 cannot be determined. The following exception
  occurred while determining the transport type: Probe returned
  null
  
  CWOBJ7851W: Received a timeout while waiting for a
  response to a
  com.ibm.ws.xs.xio.protobuf.XIOMessage$XIORefLookupRequest/reqID=
  0 message from endpoint IP_ADDR:2809. The current timeout is
  30 seconds. When the message was added, the queue size was 0.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  WebSphere eXtreme Scale users who           *
  *                  experience timeouts against all listed      *
  *                  catalog server endpoints.                   *
  ****************************************************************
  * PROBLEM DESCRIPTION: A long timeout can occur when           *
  *                      connections to all catalog server       *
  *                      endpoints time out on a client          *
  *                      connect.                                *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  If all catalog server endpoints result in a timeout during a
  client connect, the overall timeout before the client receives
  a
  connection is longer in WebSphere eXtreme Scale Server 8.6.0.6
  and later than it was in WebSphere eXtreme Scale Server
  8.6.0.5. For example, when the defaults are used for JVM
  arguments,
  com.ibm.websphere.xs.determine.transport.timeout and
  com.ibm.websphere.xs.determine.transport.attempts, then the
  time
  to exception can go to 90 seconds instead of 30 seconds.
  See the following example messages when the timeout takes 90 or
  more seconds, where the CWOBJ0210W lists "Probe returned null"
  instead of a communication exception.
  CWOBJ0204I: The transport type of this Client JVM is
  being determined by contacting the catalog service domain with
  the catalog service endpoints of: myHost:2809.
  CWOBJ0210W: The transport type of the remote server
  on myHost:2809 cannot be determined. The following exception
  occurred while determining the transport type: Probe returned
  null
  CWOBJ7851W: Received a timeout while waiting for a
  response to a
  com.ibm.ws.xs.xio.protobuf.XIOMessage$XIORefLookupRequest/reqID=
  0 message from endpoint IP_ADDR:2809. The current timeout is
  30 seconds. When the message was added, the queue size was 0.
  

Problem conclusion

• A timing window was fixed and when all catalog server endpoints
  provided in the client connection request time out, an
  exception is returned to the client instead of trying an XIO
  and ORB connection.
  

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

  WS EXTREME SCAL

• Fixed component ID

  5724X6702

Applicable component levels

• R860 PSY

     UP