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From "Robert Munteanu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (OAK-8530) Ensure MBean are deregister if the repository fails to start
Date Tue, 06 Aug 2019 11:53:00 GMT
Robert Munteanu created OAK-8530:
------------------------------------

             Summary: Ensure MBean are deregister if the repository fails to start
                 Key: OAK-8530
                 URL: https://issues.apache.org/jira/browse/OAK-8530
             Project: Jackrabbit Oak
          Issue Type: Improvement
          Components: core
            Reporter: Robert Munteanu
            Assignee: Robert Munteanu
             Fix For: 1.18.0


When used in OSGi environments the repository service is unfortunately prone to restarts (
see SLING-7811 for the gory details ). Besides the performance problem, the repository typically
fails to restart since MBeans that were registered once were not deregistered. The failures
happen before repository is constructed, so there is no instance to close.

A typical stack trace is

{noformat}
06.08.2019 09:55:03.894 *ERROR* [Apache Sling Repository Startup Thread #4] org.apache.aries.jmx.whiteboard.MBeanHolder
register: Failure registering MBean org.apache.jackrabbit.oak.management.RepositoryManager@5e05b159
javax.management.InstanceAlreadyExistsException: org.apache.jackrabbit.oak:name=repository
manager,type=RepositoryManagement
	at com.sun.jmx.mbeanserver.Repository.addMBean(Repository.java:437)
	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerWithRepository(DefaultMBeanServerInterceptor.java:1898)
	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerDynamicMBean(DefaultMBeanServerInterceptor.java:966)
	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:900)
	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:324)
	at com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:522)
	at org.apache.aries.jmx.whiteboard.MBeanHolder.register(MBeanHolder.java:114)
	at org.apache.aries.jmx.whiteboard.JmxWhiteboardSupport.registerMBean(JmxWhiteboardSupport.java:88)
	at org.apache.aries.jmx.whiteboard.Activator$MBeanTracker.addingService(Activator.java:102)
	at org.osgi.util.tracker.ServiceTracker$Tracked.customizerAdding(ServiceTracker.java:943)
	at org.osgi.util.tracker.ServiceTracker$Tracked.customizerAdding(ServiceTracker.java:871)
	at org.osgi.util.tracker.AbstractTracked.trackAdding(AbstractTracked.java:256)
	at org.osgi.util.tracker.AbstractTracked.track(AbstractTracked.java:229)
	at org.osgi.util.tracker.ServiceTracker$Tracked.serviceChanged(ServiceTracker.java:903)
	at org.apache.felix.framework.EventDispatcher.invokeServiceListenerCallback(EventDispatcher.java:990)
	at org.apache.felix.framework.EventDispatcher.fireEventImmediately(EventDispatcher.java:838)
	at org.apache.felix.framework.EventDispatcher.fireServiceEvent(EventDispatcher.java:545)
	at org.apache.felix.framework.Felix.fireServiceEvent(Felix.java:4833)
	at org.apache.felix.framework.Felix.registerService(Felix.java:3804)
	at org.apache.felix.framework.BundleContextImpl.registerService(BundleContextImpl.java:328)
	at org.apache.felix.framework.BundleContextImpl.registerService(BundleContextImpl.java:302)
	at org.apache.jackrabbit.oak.osgi.OsgiWhiteboard.register(OsgiWhiteboard.java:79)
	at org.apache.jackrabbit.oak.spi.whiteboard.WhiteboardUtils.registerMBean(WhiteboardUtils.java:115)
[org.apache.jackrabbit.oak-core-spi:1.18.0.SNAPSHOT]
	at org.apache.jackrabbit.oak.spi.whiteboard.WhiteboardUtils.registerMBean(WhiteboardUtils.java:99)
[org.apache.jackrabbit.oak-core-spi:1.18.0.SNAPSHOT]
	at org.apache.jackrabbit.oak.Oak.createNewContentRepository(Oak.java:772) [org.apache.jackrabbit.oak-core:1.18.0.SNAPSHOT]
	at org.apache.jackrabbit.oak.Oak.createContentRepository(Oak.java:671) [org.apache.jackrabbit.oak-core:1.18.0.SNAPSHOT]
	at org.apache.jackrabbit.oak.jcr.Jcr.createContentRepository(Jcr.java:376) [org.apache.jackrabbit.oak-jcr:1.18.0.SNAPSHOT]
	at org.apache.sling.jcr.oak.server.internal.OakSlingRepositoryManager.acquireRepository(OakSlingRepositoryManager.java:152)
[org.apache.sling.jcr.oak.server:1.2.2]
	at org.apache.sling.jcr.base.AbstractSlingRepositoryManager.initializeAndRegisterRepositoryService(AbstractSlingRepositoryManager.java:481)
[org.apache.sling.jcr.base:3.0.6]
	at org.apache.sling.jcr.base.AbstractSlingRepositoryManager.access$300(AbstractSlingRepositoryManager.java:86)
[org.apache.sling.jcr.base:3.0.6]
{noformat}

I will propose a patch shortly.



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