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From j...@apache.org
Subject [jira] Created: (JAMES-283) James should use default backLog value when creating a ServerSocket
Date Wed, 12 May 2004 15:08:56 GMT

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Here is an overview of the issue:
        Key: JAMES-283
    Summary: James should use default backLog value when creating a ServerSocket
       Type: Improvement

     Status: Unassigned
   Priority: Major

    Project: James
             James Core

   Reporter: Hes Siemelink

    Created: Wed, 12 May 2004 8:08 AM
    Updated: Wed, 12 May 2004 8:08 AM

We have a test where we send 100 messages simultaneously. James does not handle this well.
With a standard setup 40-70 messages are NOT handled. After tweaking the config file (allocating
more threads and connections) still 10-30 messages are not picked up.

We discovered that James specifies a very tight 'backLog' value when creating a ServerSocket.
This happens in org.apache.james.core.AbstractJamesService.initialize() on line 302:

  ServerSocket serverSocket = factory.createServerSocket(port, 5, bindTo);

(Sorry no time to do a proper diff)

We suppose that eventually a java.net.ServerSocket is created with this value. According to
the javadoc of ServerSocket, the default value is 50. This can be specified by setting the
backLog parameter to 0. See http://java.sun.com/j2se/1.4.2/docs/api/java/net/ServerSocket.html

We changed the above line in AbstractJamesService to

  ServerSocket serverSocket = factory.createServerSocket(port, 0, bindTo);

With this fix all 100 messages are accepted (on Windows 2000 Server).

We advise that James uses the default value for the backLog parameter. If there is a special
reason why the default value should be 5, please make it a parameter we can specify in the
config file.



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