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From "songdacheng (JIRA)" <axis-...@ws.apache.org>
Subject [jira] [Created] (AXIS-2878) 100% CPU hang when high pressure of concurrent requests
Date Sat, 22 Sep 2012 07:23:07 GMT
songdacheng created AXIS-2878:
---------------------------------

             Summary: 100% CPU hang when high pressure of concurrent requests
                 Key: AXIS-2878
                 URL: https://issues.apache.org/jira/browse/AXIS-2878
             Project: Axis
          Issue Type: Bug
          Components: Basic Architecture
    Affects Versions: 1.4
         Environment: R2+, R3
            Reporter: songdacheng


When we are doing the performace testing. we simulate high pressure of concurrent requests
to invoke soap service. severals hours later, CPU will be 100% and can not be released when
the pressure is stopped.
We check the stack log and have found several threads are locked at

java.util.WeakHashMap.getEntry(WeakHashMap.java:375)
java.util.WeakHashMap.containsKey(WeakHashMap.java:361)
org.apache.axis.handlers.soap.SOAPService.addSession(SOAPService.java:125)
org.apache.axis.providers.java.JavaProvider.getSessionServiceObject(JavaProvider.java:185)
org.apache.axis.providers.java.JavaProvider.getServiceObject(JavaProvider.java:100)
org.apache.axis.providers.java.JavaProvider.invoke(JavaProvider.java:287)
org.apache.axis.strategies.InvocationStrategy.visit(InvocationStrategy.java:32)
org.apache.axis.SimpleChain.doVisiting(SimpleChain.java:118)
org.apache.axis.SimpleChain.invoke(SimpleChain.java:83)
org.apache.axis.handlers.soap.SOAPService.invoke(SOAPService.java:454)
org.apache.axis.server.AxisServer.invoke(AxisServer.java:281)
org.apache.axis.transport.http.AxisServlet.doPost(AxisServlet.java:700)
javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
org.apache.axis.transport.http.AxisServletBase.service(AxisServletBase.java:327)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)


Because WeakHashMap is not safe within concurrent threads so I doubt maybe there is a problem.
I modify the method: addSession of SOAPService.java (org.apache.axis.handlers.soap)
add the 'synchronized ':
synchronized (map)
    {
      if (!(map.containsKey(session)))
      {
        map.put(session, null);
      }
    }

Then the cpu problem does not occur.


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