songdacheng created AXIS-2878:
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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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