[JBoss JIRA] Created: (JBAS-5570) URLDeploymentScanner: relies on FileInputStream finalizer - causes too many open files too easily
by Toomas Rￃﾃￂﾶmer (JIRA)
URLDeploymentScanner: relies on FileInputStream finalizer - causes too many open files too easily
-------------------------------------------------------------------------------------------------
Key: JBAS-5570
URL: http://jira.jboss.com/jira/browse/JBAS-5570
Project: JBoss Application Server
Issue Type: Feature Request
Security Level: Public (Everyone can see)
Components: Deployers
Affects Versions: JBossAS-4.2.2.GA
Environment: Running on Debian unstable with JDK 1.6_06
Reporter: Toomas Rￃﾃￂﾶmer
Assigned To: Ales Justin
I'm a JavaRebel developer from ZeroTurnaround and have been debugging an issue with "Too many open files" with JBoss that we got reported against JavaRebel.
The problem:
Users are getting "Too many open files" exceptions when starting and then using JBoss.
The reason:
*) JBoss by default has configured a mbean org.jboss.deployment.scanner.URLDeploymentScanner which scans every 5 seconds for changes in the deployment descriptors
*) The implementation does a connection = URL.openConnection() and then connection.getLastModified() to check for changes.
*) The underlying implementation for regular files is java.io.FileInputStream
*) The resource is not explicitly closed as FileInputStream will doit it by itself in the finalizer()
*) Handles are freed when GC happens (finalizer logic)
I came to this conclusion by getting the number of filehandles (lsof -p <jboss-pid>). Stepping through URLDeploymentScanner and seeing the handles grow by one after every connection.getLastModified(). In all tests the handles grow by one after this call.
I also let the handles grow to a few thousand and then attached a debugger and after hitting a breakpoint called System.gc() on the JVM and the number of filehandles nicely went down to ~380 with my deployment folder.
Possible solution:
Check for the file modification date with explicit closing.
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16 years, 4 months
[JBoss JIRA] Created: (JBAS-6443) org.jboss.ejb3.security.SecurityActions thows NPE
by Juergen Zimmermann (JIRA)
org.jboss.ejb3.security.SecurityActions thows NPE
-------------------------------------------------
Key: JBAS-6443
URL: https://jira.jboss.org/jira/browse/JBAS-6443
Project: JBoss Application Server
Issue Type: Bug
Security Level: Public (Everyone can see)
Affects Versions: JBossAS-5.0.0.GA
Reporter: Juergen Zimmermann
org.jboss.ejb3.security.SecurityActions throws a NPE. The stacktrace is shown below.
A session bean has a remote interface being invoked by a JUnit test. This session bean is just a remote facade for another session bean just having a local interface. Inside this session bean I'm adding a new role to the role table, and then I refresh the authentication cache (see below). The NPE is thrown when the wrapping "remote" session bean returns to the JUnit client.
try {
Context ctx = new InitialContext();
MBeanServerConnection server = (MBeanServerConnection) ctx.lookup("jmx/invoker/RMIAdaptor");
ctx.close();
server.invoke(new ObjectName("jboss.security", "service", "JaasSecurityManager"),
"flushAuthenticationCache",
new String[] { "hska" },
new String[] { "java.lang.String" });
}
catch (Exception e) {
throw new EJBException(e);
}
Here is the stacktrace for the NPE:
javax.ejb.EJBException: java.lang.NullPointerException
at org.jboss.ejb3.tx.Ejb3TxPolicy.handleExceptionInOurTx(Ejb3TxPolicy.java:77)
at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:83)
at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:190)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.security.RunAsSecurityInterceptorv2.invoke(RunAsSecurityInterceptorv2.java:94)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.security.RoleBasedAuthorizationInterceptorv2.invoke(RoleBasedAuthorizationInterceptorv2.java:201)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.security.Ejb3AuthenticationInterceptorv2.invoke(Ejb3AuthenticationInterceptorv2.java:159)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:41)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.BlockContainerShutdownInterceptor.invoke(BlockContainerShutdownInterceptor.java:65)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.aspects.currentinvocation.CurrentInvocationInterceptor.invoke(CurrentInvocationInterceptor.java:67)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(StatelessContainer.java:486)
at org.jboss.ejb3.session.InvokableContextClassProxyHack._dynamicInvoke(InvokableContextClassProxyHack.java:56)
at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:91)
at org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRemotingInvocationHandler.java:82)
at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:908)
at org.jboss.remoting.transport.socket.ServerThread.completeInvocation(ServerThread.java:742)
at org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:695)
at org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:522)
at org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:230)
Caused by: java.lang.NullPointerException
at org.jboss.ejb3.security.SecurityActions$14.run(SecurityActions.java:415)
at org.jboss.ejb3.security.SecurityActions$14.run(SecurityActions.java:412)
at java.security.AccessController.doPrivileged(Native Method)
at org.jboss.ejb3.security.SecurityActions.popRunAs(SecurityActions.java:410)
at org.jboss.ejb3.security.RunAsSecurityInterceptorv2.invoke(RunAsSecurityInterceptorv2.java:99)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.security.RoleBasedAuthorizationInterceptorv2.invoke(RoleBasedAuthorizationInterceptorv2.java:201)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.security.Ejb3AuthenticationInterceptorv2.invoke(Ejb3AuthenticationInterceptorv2.java:159)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:41)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.BlockContainerShutdownInterceptor.invoke(BlockContainerShutdownInterceptor.java:65)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.aspects.currentinvocation.CurrentInvocationInterceptor.invoke(CurrentInvocationInterceptor.java:67)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.session.SessionSpecContainer.invoke(SessionSpecContainer.java:219)
at org.jboss.ejb3.proxy.handler.ProxyInvocationHandlerBase.invoke(ProxyInvocationHandlerBase.java:261)
at org.jboss.ejb3.proxy.handler.session.SessionSpecProxyInvocationHandlerBase.invoke(SessionSpecProxyInvocationHandlerBase.java:101)
at $Proxy426.addRolle(Unknown Source)
at de.hska.test.KundenverwaltungTestBean.addRolle(KundenverwaltungTestBean.java:110)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.jboss.aop.joinpoint.MethodInvocation.invokeTarget(MethodInvocation.java:122)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:111)
at org.jboss.ejb3.EJBContainerInvocationWrapper.invokeNext(EJBContainerInvocationWrapper.java:69)
at org.jboss.ejb3.interceptors.aop.InterceptorSequencer.invoke(InterceptorSequencer.java:73)
at org.jboss.ejb3.interceptors.aop.InterceptorSequencer.aroundInvoke(InterceptorSequencer.java:59)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.jboss.aop.advice.PerJoinpointAdvice.invoke(PerJoinpointAdvice.java:174)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor.fillMethod(InvocationContextInterceptor.java:72)
at org.jboss.aop.advice.org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor_z_fillMethod_4437435.invoke(InvocationContextInterceptor_z_fillMethod_4437435.java)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor.setup(InvocationContextInterceptor.java:88)
at org.jboss.aop.advice.org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor_z_setup_4437435.invoke(InvocationContextInterceptor_z_setup_4437435.java)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:62)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:56)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.tx.NullInterceptor.invoke(NullInterceptor.java:42)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:68)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:79)
at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:190)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.security.RunAsSecurityInterceptorv2.invoke(RunAsSecurityInterceptorv2.java:94)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.security.RoleBasedAuthorizationInterceptorv2.invoke(RoleBasedAuthorizationInterceptorv2.java:201)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.security.Ejb3AuthenticationInterceptorv2.invoke(Ejb3AuthenticationInterceptorv2.java:159)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:41)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.BlockContainerShutdownInterceptor.invoke(BlockContainerShutdownInterceptor.java:65)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.aspects.currentinvocation.CurrentInvocationInterceptor.invoke(CurrentInvocationInterceptor.java:67)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(StatelessContainer.java:486)
at org.jboss.ejb3.session.InvokableContextClassProxyHack._dynamicInvoke(InvokableContextClassProxyHack.java:56)
at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:91)
at org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRemotingInvocationHandler.java:82)
at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:908)
at org.jboss.remoting.transport.socket.ServerThread.completeInvocation(ServerThread.java:742)
at org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:695)
at org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:522)
at org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:230)
at org.jboss.remoting.MicroRemoteClientInvoker.invoke(MicroRemoteClientInvoker.java:206)
at org.jboss.remoting.Client.invoke(Client.java:1708)
at org.jboss.remoting.Client.invoke(Client.java:612)
at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:60)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:61)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.security.client.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:65)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:76)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.aspects.remoting.PojiProxy.invoke(PojiProxy.java:62)
at $Proxy16.invoke(Unknown Source)
at org.jboss.ejb3.proxy.handler.ProxyInvocationHandlerBase.invoke(ProxyInvocationHandlerBase.java:261)
at org.jboss.ejb3.proxy.handler.session.SessionSpecProxyInvocationHandlerBase.invoke(SessionSpecProxyInvocationHandlerBase.java:101)
at $Proxy14.addRolle(Unknown Source)
at de.hska.test.KundenverwaltungTest.addAndRemoveRolle(KundenverwaltungTest.java:745)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.experimental.theories.Theories$TheoryAnchor$2.evaluate(Theories.java:157)
at org.junit.internal.runners.statements.ExpectException.evaluate(ExpectException.java:22)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
at org.junit.experimental.theories.Theories$TheoryAnchor$1$1.evaluate(Theories.java:123)
at org.junit.experimental.theories.Theories$TheoryAnchor.runWithCompleteAssignment(Theories.java:109)
at org.junit.experimental.theories.Theories$TheoryAnchor.runWithAssignment(Theories.java:93)
at org.junit.experimental.theories.Theories$TheoryAnchor.evaluate(Theories.java:79)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:73)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:46)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:180)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:41)
at org.junit.runners.ParentRunner$1.evaluate(ParentRunner.java:173)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
at org.junit.runners.ParentRunner.run(ParentRunner.java:220)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:45)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:72)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:61)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.security.client.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:65)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:76)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.aspects.remoting.PojiProxy.invoke(PojiProxy.java:62)
at $Proxy16.invoke(Unknown Source)
at org.jboss.ejb3.proxy.handler.ProxyInvocationHandlerBase.invoke(ProxyInvocationHandlerBase.java:261)
at org.jboss.ejb3.proxy.handler.session.SessionSpecProxyInvocationHandlerBase.invoke(SessionSpecProxyInvocationHandlerBase.java:101)
at $Proxy14.addRolle(Unknown Source)
at de.hska.test.KundenverwaltungTest.addAndRemoveRolle(KundenverwaltungTest.java:745)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.experimental.theories.Theories$TheoryAnchor$2.evaluate(Theories.java:157)
at org.junit.internal.runners.statements.ExpectException.evaluate(ExpectException.java:22)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
at org.junit.experimental.theories.Theories$TheoryAnchor$1$1.evaluate(Theories.java:123)
at org.junit.experimental.theories.Theories$TheoryAnchor.runWithCompleteAssignment(Theories.java:109)
at org.junit.experimental.theories.Theories$TheoryAnchor.runWithAssignment(Theories.java:93)
at org.junit.experimental.theories.Theories$TheoryAnchor.evaluate(Theories.java:79)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:73)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:46)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:180)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:41)
at org.junit.runners.ParentRunner$1.evaluate(ParentRunner.java:173)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
at org.junit.runners.ParentRunner.run(ParentRunner.java:220)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:45)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
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16 years, 4 months
[JBoss JIRA] Created: (JGRP-822) NAKACK: concurrent delivery of messages from the same sender
by Bela Ban (JIRA)
NAKACK: concurrent delivery of messages from the same sender
------------------------------------------------------------
Key: JGRP-822
URL: https://jira.jboss.org/jira/browse/JGRP-822
Project: JGroups
Issue Type: Feature Request
Reporter: Bela Ban
Assignee: Bela Ban
Fix For: 2.x
JGroups delivers messages from different senders concurrently. However, it delivers messages from the same sender sequentially. Sometimes, we can deliver messages from the same sender concurrently too, if the app tells us it is okay. For example:
- Node N was 3 HTTP sessions: A, B and C
- Clients update those sessions concurrently
- As a result, N sends the following messages: A1, B1, A2, C1, C2, C3, B2, A3
- As NAKACK assigns sequence numbers (seqnos) based on JGroups instances, all messages from N will have to be
delivered in the same order in which they were sent, e.g. (-> means followed by):
A1 -> B1 -> A2 -> C1 -> C2 -> C3 -> B2 -> A3
- This means that, for example, the first update to C (C1) has to wait until A1, B1 and A2 have been delivered
- This is not optimal, as updates for A, B and C are completely independent, and can be delivered in parallel
- So a better delivery would be ('||' means concurrent delivery):
A1 -> A2 -> A3 || B1 -> B2 || C1 -> C2 -> C3
- A3 needs to be delivered after A2 which needs to be delivered after A1. However, all updates for A can be delivered
concurrently with messages for B or C.
- OOB doesn't help: here all messages are delivered concurrently, but there is also no ordering within A, B or C !
SOLUTION: the sender adds a 'scope' token to a Message, e.g. the jsessionid (A, B or C). JGroups maintains NakReceiverWindows per *scope*, not per sender. The sender's address is the default token, so in the absence of a scope token, JGroups of course maintains NakReceiverWindows per sender. (NakReceiverWindows are used to keep track of seqnos).
In the above example, if the scopes sent with *each message* are A, B and C, then we'd have 3 NakReceiverWindows:
N::A, N::B, N::C.
Each window would start with seqno 1, so updates for A, B and C are delivered concurrently with respect to each other, but sequentially within the scope.
Issues:
- This is an API change, and should probably be propagated up to the building blocks, such as RpcDispatcher.
- A scope needs to be associated with an address A (of a JGroups instance): when A leaves or crashes, all associated scopes and their NakReceiverWindows needs to be released, too
- Should this be done for UNICAST too ?
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16 years, 4 months
[JBoss JIRA] Created: (JBAS-6293) Chapter 11 example missing from JBoss AS 5.0.0.GA
by Bruce Link (JIRA)
Chapter 11 example missing from JBoss AS 5.0.0.GA
-------------------------------------------------
Key: JBAS-6293
URL: https://jira.jboss.org/jira/browse/JBAS-6293
Project: JBoss Application Server
Issue Type: Bug
Security Level: Public (Everyone can see)
Components: Docs/Installation and Getting Started Guide
Affects Versions: JBossAS-5.0.0.GA
Environment: Not applicable
Reporter: Bruce Link
Assignee: Samson Kittoli
The installation and getting started guide discusses a jsfejb3 example.
"11.4.1. Building The Application
Let's look at building the example application and then explore the configuration files in detail.
In Chapter 10, Sample Applications , we looked at the directory structure of the jsfejb3 sample application. "
The example directory does not exist in the referenced %JBOSS_HOME%/docs/examples directory.
Chapter 10 does not look at the directory structure of this or any other sample application.
Reference to actual application directory and code/configuration and build files needs to be provided
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16 years, 4 months
