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From Laures <baetz.alexan...@googlemail.com>
Subject OutOfMemoryError: unable to create new native thread
Date Thu, 24 Mar 2011 12:08:30 GMT
Hi,

I'm currently load testing the native REST Api of activemq on our hardware.
I'm using pylot to generate several users.

Some time into the test i start to get:

 WARN | Error for /rest/message/FOO/BAR
java.lang.OutOfMemoryError: unable to create new native thread
        at java.lang.Thread.start0(Native Method)
        at java.lang.Thread.start(Thread.java:640)
        at
org.apache.activemq.thread.TaskRunnerFactory.execute(TaskRunnerFactory.java:92)
        at
org.apache.activemq.thread.TaskRunnerFactory.execute(TaskRunnerFactory.java:85)
        at
org.apache.activemq.broker.TransportConnector$1.onAccept(TransportConnector.java:211)
        at
org.apache.activemq.transport.vm.VMTransportServer.connect(VMTransportServer.java:91)
        at
org.apache.activemq.transport.vm.VMTransportFactory.doCompositeConnect(VMTransportFactory.java:145)
        at
org.apache.activemq.transport.vm.VMTransportFactory.doConnect(VMTransportFactory.java:53)
        at
org.apache.activemq.transport.TransportFactory.doConnect(TransportFactory.java:51)
        at
org.apache.activemq.transport.TransportFactory.connect(TransportFactory.java:80)
        at
org.apache.activemq.ActiveMQConnectionFactory.createTransport(ActiveMQConnectionFactory.java:243)
        at
org.apache.activemq.ActiveMQConnectionFactory.createActiveMQConnection(ActiveMQConnectionFactory.java:258)
        at
org.apache.activemq.ActiveMQConnectionFactory.createActiveMQConnection(ActiveMQConnectionFactory.java:230)
        at
org.apache.activemq.ActiveMQConnectionFactory.createConnection(ActiveMQConnectionFactory.java:178)
        at
org.apache.activemq.web.WebClient.getConnection(WebClient.java:246)
        at
org.apache.activemq.web.WebClient.createSession(WebClient.java:348)
        at org.apache.activemq.web.WebClient.getSession(WebClient.java:239)
        at
org.apache.activemq.web.MessageServletSupport.getDestination(MessageServletSupport.java:319)
        at
org.apache.activemq.web.MessageServletSupport.getDestination(MessageServletSupport.java:267)
        at
org.apache.activemq.web.MessageServlet.doPost(MessageServlet.java:110)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:713)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
        at
org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:527)
        at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1216)
        at
org.apache.activemq.web.SessionFilter.doFilter(SessionFilter.java:45)
        at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1187)
        at
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:421)
        at
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119)
        at
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:493)
        at
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:225)
        at
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:930)
        at
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:358)
        at
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:183)
        at
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:866)
        at
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)
        at
org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:126)
        at
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:456)
        at
org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:126)
        at
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:113)
        at org.eclipse.jetty.server.Server.handle(Server.java:351)
        at
org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:594)
        at
org.eclipse.jetty.server.HttpConnection$RequestHandler.content(HttpConnection.java:1059)
        at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:764)
        at
org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:217)
        at
org.eclipse.jetty.server.HttpConnection.handle(HttpConnection.java:424)
        at
org.eclipse.jetty.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:506)
        at
org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:436)
        at java.lang.Thread.run(Thread.java:662)

What causes the activemq to generate several thousand threads for my few
users?

I allready tried to use dedicatedTaskRunner=false in my broker conf. There
was no effect.

Greetings,
Alexander

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