Issue

AEM is using MongoMK for storage.  A MongoTimeoutException error is observed during AEM startup and startup fails: 

03.04.2017 15:16:38.907 *ERROR* [FelixStartLevel] org.apache.jackrabbit.oak-core [org.apache.jackrabbit.oak.plugins.document.DocumentNodeStoreService(157)] The activate method has thrown an exception (com.mongodb.MongoTimeoutException: Timed out after 10000 ms while waiting for a server that matches {serverSelectors=[ReadPreferenceServerSelector{readPreference=primary}, LatencyMinimizingServerSelector{acceptableLatencyDifference=15 ms}]}. Client view of cluster state is {type=ReplicaSet, servers=[{address=host1:30000, type=ReplicaSetArbiter, averageLatency=0.6 ms, state=Connected}, {host2:27017, type=Unknown, state=Connecting}, {address=host3:27017, type=ReplicaSetSecondary, averageLatency=0.7 ms, state=Connected}])
com.mongodb.MongoTimeoutException: Timed out after 10000 ms while waiting for a server that matches {serverSelectors=[ReadPreferenceServerSelector{readPreference=primary}, LatencyMinimizingServerSelector{acceptableLatencyDifference=15 ms}]}. Client view of cluster state is {type=ReplicaSet, servers=[{address=host1:30000, type=ReplicaSetArbiter, averageLatency=0.6 ms, state=Connected}, {address=host2:27017, type=Unknown, state=Connecting}, {address=host3:27017, type=ReplicaSetSecondary, averageLatency=0.7 ms, state=Connected}]
at com.mongodb.BaseCluster.getServer(BaseCluster.java:82)
at com.mongodb.DBTCPConnector.getServer(DBTCPConnector.java:669)
at com.mongodb.DBTCPConnector.access$500(DBTCPConnector.java:40)
at com.mongodb.DBTCPConnector$MyPort.getConnection(DBTCPConnector.java:518)
at com.mongodb.DBTCPConnector$MyPort.get(DBTCPConnector.java:461)
at com.mongodb.DBTCPConnector.innerCall(DBTCPConnector.java:288)
at com.mongodb.DBTCPConnector.call(DBTCPConnector.java:273)
at com.mongodb.DBCollectionImpl.find(DBCollectionImpl.java:86)
at com.mongodb.DB.command(DB.java:320)
at com.mongodb.DB.command(DB.java:299)
at com.mongodb.DB.command(DB.java:374)
at com.mongodb.DB.command(DB.java:246)
at com.mongodb.DB.command(DB.java:401)
at org.apache.jackrabbit.oak.plugins.document.mongo.MongoDocumentStore.checkVersion(MongoDocumentStore.java:254)
at org.apache.jackrabbit.oak.plugins.document.mongo.MongoDocumentStore.<init>(MongoDocumentStore.java:201)
at org.apache.jackrabbit.oak.plugins.document.DocumentMK$Builder.setMongoDB(DocumentMK.java:576)
at org.apache.jackrabbit.oak.plugins.document.DocumentMK$Builder.setMongoDB(DocumentMK.java:559)
at org.apache.jackrabbit.oak.plugins.document.DocumentNodeStoreService.registerNodeStore(DocumentNodeStoreService.java:466)
at org.apache.jackrabbit.oak.plugins.document.DocumentNodeStoreService.registerNodeStoreIfPossible(DocumentNodeStoreService.java:374)
at org.apache.jackrabbit.oak.plugins.document.DocumentNodeStoreService.activate(DocumentNodeStoreService.java:358)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.felix.scr.impl.helper.BaseMethod.invokeMethod(BaseMethod.java:222)
at org.apache.felix.scr.impl.helper.BaseMethod.access$500(BaseMethod.java:37)
at org.apache.felix.scr.impl.helper.BaseMethod$Resolved.invoke(BaseMethod.java:615)
at org.apache.felix.scr.impl.helper.BaseMethod.invoke(BaseMethod.java:499)
at org.apache.felix.scr.impl.helper.ActivateMethod.invoke(ActivateMethod.java:295)
at org.apache.felix.scr.impl.manager.SingleComponentManager.createImplementationObject(SingleComponentManager.java:302)
at org.apache.felix.scr.impl.manager.SingleComponentManager.createComponent(SingleComponentManager.java:113)
at org.apache.felix.scr.impl.manager.SingleComponentManager.getService(SingleComponentManager.java:866)
at org.apache.felix.scr.impl.manager.SingleComponentManager.getServiceInternal(SingleComponentManager.java:833)
at org.apache.felix.scr.impl.manager.AbstractComponentManager.activateInternal(AbstractComponentManager.java:724)
at org.apache.felix.scr.impl.manager.AbstractComponentManager.enable(AbstractComponentManager.java:399)
at org.apache.felix.scr.impl.config.ConfigurableComponentHolder.enableComponents(ConfigurableComponentHolder.java:676)
at org.apache.felix.scr.impl.BundleComponentActivator.initialEnable(BundleComponentActivator.java:339)
at org.apache.felix.scr.impl.Activator.loadComponents(Activator.java:360)
at org.apache.felix.scr.impl.Activator.access$000(Activator.java:53)
at org.apache.felix.scr.impl.Activator$ScrExtension.start(Activator.java:260)
at org.apache.felix.utils.extender.AbstractExtender.createExtension(AbstractExtender.java:259)
at org.apache.felix.utils.extender.AbstractExtender.modifiedBundle(AbstractExtender.java:232)
at org.osgi.util.tracker.BundleTracker$Tracked.customizerModified(BundleTracker.java:482)
at org.osgi.util.tracker.BundleTracker$Tracked.customizerModified(BundleTracker.java:415)
at org.osgi.util.tracker.AbstractTracked.track(AbstractTracked.java:232)
at org.osgi.util.tracker.BundleTracker$Tracked.bundleChanged(BundleTracker.java:444)
at org.apache.felix.framework.util.EventDispatcher.invokeBundleListenerCallback(EventDispatcher.java:916)
at org.apache.felix.framework.util.EventDispatcher.fireEventImmediately(EventDispatcher.java:835)
at org.apache.felix.framework.util.EventDispatcher.fireBundleEvent(EventDispatcher.java:517)
at org.apache.felix.framework.Felix.fireBundleEvent(Felix.java:4541)
at org.apache.felix.framework.Felix.startBundle(Felix.java:2172)
at org.apache.felix.framework.Felix.setActiveStartLevel(Felix.java:1371)
at org.apache.felix.framework.FrameworkStartLevelImpl.run(FrameworkStartLevelImpl.java:308)
at java.lang.Thread.run(Thread.java:745)
03.04.2017 15:16:38.908 *ERROR* [FelixStartLevel] org.apache.jackrabbit.oak-core [org.apache.jackrabbit.oak.plugins.document.DocumentNodeStoreService(157)] Failed creating the component instance; see log for reason

Cause

There could be some firewall problem, network connectivity issue, or Mongo Java Driver problem.

Resolution

Set the connectTimeoutMS to 120000 (2 minutes) in the MongoURI to increase the timeout time.  Your MongoURI is either set in the start script JVM parameters or in the org.apache.jackrabbit.oak.plugins.document.DocumentNodeStoreService.config file under crx-quickstart/install.

For example, your MongoURI might look something like this: 

mongodb://db1.example.net,db2.example.net:2500/?replicaSet=test&connectTimeoutMS=120000

If this doesn't solve the problem then work with your Network operations and DBA team that manages MongoDB.  Debug the network connectivity between the AEM server and the MongoDB servers.  Check the replica set connectivity as well.

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