[SLING-4882] Shared session usage in Sling MapEntries causes contention

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: Resource Resolver 1.4.0
• Component/s: ResourceResolver
• Assignee: Antonio Sanso
• Reporter: Antonio Sanso
• Created: 15/Jul/15 04:39
• Updated: 08/Feb/16 22:12
• Resolved: 15/Jul/15 09:11

Description

"pool-7-thread-103" prio=10 tid=0x00007fede006c000 nid=0x6db8 waiting on condition [0x00007fecdbb7a000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000005063f5b00> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)
	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:867)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1197)
	at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:214)
	at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:290)
	at org.apache.jackrabbit.oak.jcr.delegate.SessionDelegate$WarningLock.lock(SessionDelegate.java:744)
	at org.apache.jackrabbit.oak.jcr.delegate.SessionDelegate$WarningLock.lock(SessionDelegate.java:775)
	at org.apache.jackrabbit.oak.jcr.delegate.SessionDelegate.perform(SessionDelegate.java:271)
	at org.apache.jackrabbit.oak.jcr.session.SessionImpl.perform(SessionImpl.java:127)
	at org.apache.jackrabbit.oak.jcr.session.SessionImpl.refresh(SessionImpl.java:430)
	at sun.reflect.GeneratedMethodAccessor46.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.apache.sling.jcr.base.SessionProxyHandler$SessionProxyInvocationHandler.invoke(SessionProxyHandler.java:113)
	at com.sun.proxy.$Proxy7.refresh(Unknown Source)
	at org.apache.sling.jcr.resource.internal.helper.jcr.JcrResourceProvider.refresh(JcrResourceProvider.java:545)
	at org.apache.sling.resourceresolver.impl.helper.ResourceResolverContext.refresh(ResourceResolverContext.java:192)
	at org.apache.sling.resourceresolver.impl.ResourceResolverImpl.refresh(ResourceResolverImpl.java:1186)
	at org.apache.sling.resourceresolver.impl.mapping.MapEntries.doAddAttributes(MapEntries.java:321)
	at org.apache.sling.resourceresolver.impl.mapping.MapEntries.handleEvent(MapEntries.java:776)
	at org.apache.felix.eventadmin.impl.handler.EventHandlerProxy.sendEvent(EventHandlerProxy.java:412)
	at org.apache.felix.eventadmin.impl.tasks.SyncDeliverTasks.execute(SyncDeliverTasks.java:118)
	at org.apache.felix.eventadmin.impl.handler.EventAdminImpl.sendEvent(EventAdminImpl.java:114)
	at org.apache.felix.eventadmin.impl.security.EventAdminSecurityDecorator.sendEvent(EventAdminSecurityDecorator.java:96)
	at org.apache.sling.jcr.resource.internal.OakResourceListener.sendOsgiEvent(OakResourceListener.java:243)
	at org.apache.sling.jcr.resource.internal.OakResourceListener.added(OakResourceListener.java:109)
	at org.apache.jackrabbit.oak.plugins.observation.NodeObserver$NodeEventHandler.leave(NodeObserver.java:209)
	at org.apache.jackrabbit.oak.plugins.observation.FilteredHandler.leave(FilteredHandler.java:51)
	at org.apache.jackrabbit.oak.plugins.observation.EventGenerator$Continuation.run(EventGenerator.java:182)
	at org.apache.jackrabbit.oak.plugins.observation.EventGenerator.generate(EventGenerator.java:124)
	at org.apache.jackrabbit.oak.plugins.observation.NodeObserver.contentChanged(NodeObserver.java:163)
	at org.apache.jackrabbit.oak.spi.commit.BackgroundObserver$1$1.call(BackgroundObserver.java:124)
	at org.apache.jackrabbit.oak.spi.commit.BackgroundObserver$1$1.call(BackgroundObserver.java:118)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)