[Design of Clustering on JBoss (Clusters/JBoss)] - Distributed Lock Mechanism
by epbernard
Hi guys,
For Hibernate Search, I'm in need for a DLM (Distributed Lock Mechanism). Basically a way to acquire a lock, do some stuff and release a lock clusterwise.
This is something that can be available and built on top of JGroups.
I've talked to a RH instructor and we discussed the DLM available in GFS (Global file System).
To summarize:
- there is a quorum (each node having a weight)
- a subset of the cluster is considered free to work if it has quorum/2+1
- when a node ask for a lock, it informs everybody, and everybody has to agree on the lock acquisition
- if a lock is acquired the demanding node is responsible for managing the lock
- if a node is playing the bad guy or has been cut from the majority, it reboots itself or is made rebooted hoping for a recovery
This implementation is not really fully self configurable (entering and leaving the quorum part might have to be manual)
Do you think we can build something similar as a common project for JBoss, I need it but most likely, some other projects need that too.
I'm pretty open to the feature support as well.
There may be something available already?
Thoughts?
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19 years, 2 months
[Design of Messaging on JBoss (Messaging/JBoss)] - Non connected remoting clients throwing java.lang.Exception
by clebert.suconic＠jboss.com
I guess we have changed remoting to disconnect clients when ConnectionValidator fails, and I have seen situations where invocations are failing on the testsuite.
FailoverTest(Clustering)::testFailoverMessageOnServer2 is an example of such behavior.
I guess we should change (or ask remoting team to do it), in such way We should not disconnect remoting clients... or at least throw a meaninful Exception we could catch on FailoverValveInterceptor.
This is the exception we are catching now:
anonymous wrote : java.lang.Exception: Can not make remoting client invocation due to not being connected to server.
| at org.jboss.remoting.Client.invoke(Client.java:639)
| at org.jboss.remoting.Client.invoke(Client.java:627)
| at org.jboss.jms.client.delegate.DelegateSupport.invoke(DelegateSupport.java:118)
| at org.jboss.jms.client.delegate.ClientSessionDelegate$createConsumerDelegate_N5002091796089334799.invokeNext(ClientSessionDelegate$createConsumerDelegate_N5002091796089334799.java)
| at org.jboss.jms.client.container.StateCreationAspect.handleCreateConsumerDelegate(StateCreationAspect.java:153)
| at org.jboss.aop.advice.org.jboss.jms.client.container.StateCreationAspect17.invoke(StateCreationAspect17.java)
| at org.jboss.jms.client.delegate.ClientSessionDelegate$createConsumerDelegate_N5002091796089334799.invokeNext(ClientSessionDelegate$createConsumerDelegate_N5002091796089334799.java)
| at org.jboss.jms.client.container.ConsumerAspect.handleCreateConsumerDelegate(ConsumerAspect.java:67)
| at org.jboss.aop.advice.org.jboss.jms.client.container.ConsumerAspect16.invoke(ConsumerAspect16.java)
| at org.jboss.jms.client.delegate.ClientSessionDelegate$createConsumerDelegate_N5002091796089334799.invokeNext(ClientSessionDelegate$createConsumerDelegate_N5002091796089334799.java)
| at org.jboss.jms.client.container.ClosedInterceptor.invoke(ClosedInterceptor.java:177)
| at org.jboss.aop.advice.PerInstanceInterceptor.invoke(PerInstanceInterceptor.java:117)
| at org.jboss.jms.client.delegate.ClientSessionDelegate$createConsumerDelegate_N5002091796089334799.invokeNext(ClientSessionDelegate$createConsumerDelegate_N5002091796089334799.java)
| at org.jboss.jms.client.container.ExceptionInterceptor.invoke(ExceptionInterceptor.java:71)
| at org.jboss.jms.client.delegate.ClientSessionDelegate$createConsumerDelegate_N5002091796089334799.invokeNext(ClientSessionDelegate$createConsumerDelegate_N5002091796089334799.java)
| at org.jboss.jms.client.container.FailoverValveInterceptor.invoke(FailoverValveInterceptor.java:112)
| at org.jboss.aop.advice.PerInstanceInterceptor.invoke(PerInstanceInterceptor.java:117)
| at org.jboss.jms.client.delegate.ClientSessionDelegate$createConsumerDelegate_N5002091796089334799.invokeNext(ClientSessionDelegate$createConsumerDelegate_N5002091796089334799.java)
| at org.jboss.jms.client.container.ClientLogInterceptor.invoke(ClientLogInterceptor.java:107)
| at org.jboss.jms.client.delegate.ClientSessionDelegate$createConsumerDelegate_N5002091796089334799.invokeNext(ClientSessionDelegate$createConsumerDelegate_N5002091796089334799.java)
| at org.jboss.jms.client.delegate.ClientSessionDelegate.createConsumerDelegate(ClientSessionDelegate.java)
| at org.jboss.jms.client.JBossSession.createConsumer(JBossSession.java:254)
| at org.jboss.jms.client.JBossSession.createConsumer(JBossSession.java:226)
| at org.jboss.test.messaging.jms.clustering.FailoverTest.testFailoverMessageOnServer2(FailoverTest.java:1483)
| 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:585)
| at junit.framework.TestCase.runTest(TestCase.java:154)
| at junit.framework.TestCase.runBare(TestCase.java:127)
| at junit.framework.TestResult$1.protect(TestResult.java:106)
| at junit.framework.TestResult.runProtected(TestResult.java:124)
| at junit.framework.TestResult.run(TestResult.java:109)
| at junit.framework.TestCase.run(TestCase.java:118)
| at junit.framework.TestSuite.runTest(TestSuite.java:208)
| at junit.framework.TestSuite.run(TestSuite.java:203)
| at junit.textui.TestRunner.doRun(TestRunner.java:116)
| at junit.textui.TestRunner.start(TestRunner.java:172)
| at org.jboss.test.messaging.tools.junit.SelectiveTestRunner.main(SelectiveTestRunner.java:58)
|
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19 years, 2 months