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https://issues.apache.org/jira/browse/AXIS-2878?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andreas Veithen resolved AXIS-2878.
-----------------------------------
Resolution: Fixed
Fix Version/s: 1.4.1
> 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
> Assignee: Andreas Veithen
> Fix For: 1.4.1
>
>
> 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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