IT43706: INTEGRATION NODE WIDE LISTENER CAN GIVE TIMEOUT RESPONSE UNDER HEAVY LOAD.

APAR status

• Closed as program error.

Error description

• If HTTP Listener using flow is using  HTTP Request to invoke
  another HTTP Listener using flow then same thread allocation can
  lead do deadlock and hence timeout for first invoked HTTP
  Listener using flow.
  

Local fix

• setting MaxKeepAliveRequests to 1 and increasing ListenerThreads
  to a value based on incoming request load might help.
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  All Users of App Connect Enterprise V12 using the Integration
  Node listener to execute web services flows which then make an
  inline call to another web service flow implemented on the same
  Integration Node.
  
  An example of an affected configuration would be:
  
  Flow 1
  HTTP Input Node (/flow1) -> HTTPRequestNode to (/flow2) -> HTTP
  Reply Node
  
  Flow 2
  <span style="background-color:rgb(255, 255, 255)">HTTP Input
  Node (/flow2)</span><span style="background-color:rgb(255, 255,
  255)"> </span><span style="background-color:rgb(255, 255,
  255)">-> HTTP Reply Node</span>
  
  Affected nodes include flows starting with HTTPInput or
  SOAPInput Nodes and making requests using any of the
  HTTPRequest, SOAPRequest, RESTRequest, HTTP Async Request, SOAP
  Async Request or REST Async Request Nodes.
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  Requests to the second flow may timeout unexpectedly. The
  problem is caused by the listener scheduling work on the same
  thread which is waiting for a response from the first message
  flow in the scenario.
  

Problem conclusion

• The Integration Node level listener has been modified such that
  work is no longer scheduled on threads which are waiting for a
  response.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v12.0      12.0.9.0
  
  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

  5724J0560

Applicable component levels