[Building Sakai] gradebook thread result in high app cpu

Zhen Qian zqian at umich.edu
Fri Mar 15 08:50:18 PDT 2013 

Hi, developers:

We are running Gradebook Sakai-2.9.0 tag. Recently we have seen multiple
threads similar to the following pattern got spawned and triggered high app
cpu.

Where is the transformToOrderedEnrollmentMapWithFunction() called from UI?
Is this related to any previously reported Gradebook performance problems?

Thanks,

- Zhen

ajp-apr-127.0.0.1-8009-exec-23" daemon prio=10 tid=0x0000000001b77800
nid=0x5f6d runnable [0x00007fda5165b000]
   java.lang.Thread.State: RUNNABLE
    at sun.text.ComposedCharIter.next(ComposedCharIter.java:70)
    at java.text.RBTableBuilder.addComposedChars(RBTableBuilder.java:182)
    at java.text.RBTableBuilder.build(RBTableBuilder.java:158)
    at java.text.RBCollationTables.<init>(RBCollationTables.java:83)
    at java.text.RuleBasedCollator.<init>(RuleBasedCollator.java:300)
    at java.text.RuleBasedCollator.<init>(RuleBasedCollator.java:281)
    at
org.sakaiproject.tool.gradebook.ui.EnrollmentTableBean$1.compare(EnrollmentTableBean.java:71)
    at
org.sakaiproject.tool.gradebook.ui.EnrollmentTableBean$1.compare(EnrollmentTableBean.java:66)
    at java.util.TimSort.binarySort(TimSort.java:265)
    at java.util.TimSort.sort(TimSort.java:208)
    at java.util.TimSort.sort(TimSort.java:173)
    at java.util.Arrays.sort(Arrays.java:659)
    at java.util.Collections.sort(Collections.java:217)
    at
org.sakaiproject.tool.gradebook.ui.EnrollmentTableBean.transformToOrderedEnrollmentMapWithFunction(EnrollmentTableBean.java:371)
    at
org.sakaiproject.tool.gradebook.ui.EnrollmentTableBean.getOrderedEnrollmentMapForItem(EnrollmentTableBean.java:262)
    at
org.sakaiproject.tool.gradebook.ui.AssignmentDetailsBean.init(AssignmentDetailsBean.java:338)
    at
org.sakaiproject.tool.gradebook.ui.InitializableBean.startRenderResponse(InitializableBean.java:69)
    at
org.sakaiproject.jsf.component.FlowState.encodeBegin(FlowState.java:131)
    at
javax.faces.webapp.UIComponentTag.encodeBegin(UIComponentTag.java:467)
    at javax.faces.webapp.UIComponentTag.doStartTag(UIComponentTag.java:320)
    at
org.apache.jsp.assignmentDetails_jsp._jspx_meth_sakai_005fflowState_005f0(assignmentDetails_jsp.java:677)
    at
org.apache.jsp.assignmentDetails_jsp._jspService(assignmentDetails_jsp.java:379)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
    at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at
org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:286)
    at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:749)
    at
org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:487)
    at
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:412)
    at
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:339)
    at
org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(ServletExternalContextImpl.java:419)
    at
org.apache.myfaces.application.jsp.JspViewHandlerImpl.renderView(JspViewHandlerImpl.java:211)
    at
org.sakaiproject.jsf.app.SakaiViewHandler.renderView(SakaiViewHandler.java:159)
    at
org.apache.myfaces.lifecycle.RenderResponseExecutor.execute(RenderResponseExecutor.java:41)
    at
org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:132)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:140)
    at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:634)
    at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at
org.sakaiproject.tool.gradebook.ui.RoleFilter.doFilter(RoleFilter.java:145)
    at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at
org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:349)
    at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:749)
    at
org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:487)
    at
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:412)
    at
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:339)
    at
org.sakaiproject.jsf.util.HelperAwareJsfTool.dispatch(HelperAwareJsfTool.java:170)
    at org.sakaiproject.jsf.util.JsfTool.doPost(JsfTool.java:256)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:749)
    at
org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:487)
    at
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:379)
    at
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:339)
    at
org.sakaiproject.tool.impl.ActiveToolComponent$MyActiveTool.forward(ActiveToolComponent.java:511)
    at
org.sakaiproject.portal.charon.SkinnableCharonPortal.forwardTool(SkinnableCharonPortal.java:1482)
    at
org.sakaiproject.portal.charon.handlers.ToolHandler.doTool(ToolHandler.java:213)
    at
org.sakaiproject.portal.charon.handlers.ToolHandler.doGet(ToolHandler.java:96)
    at
org.sakaiproject.portal.charon.handlers.ToolHandler.doPost(ToolHandler.java:73)
    at
org.sakaiproject.portal.charon.SkinnableCharonPortal.doPost(SkinnableCharonPortal.java:1272)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:695)
    at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
    at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
    at
org.apache.coyote.ajp.AjpAprProcessor.process(AjpAprProcessor.java:197)
    at
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at
org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1822)
    - locked <0x00000005bd1c4d40> (a
org.apache.tomcat.util.net.SocketWrapper)
    at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:722)
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