Suddenly we get thousands of log entries of level ERROR with respect to ObservationManager and intermediary nodes

We get the following type of errors in very large numbers and very fast.

Mar 17 11:05:27 s1720 2010-03-17 11:05:26,969 ERROR [ClusterNode-s1720] org.apache.jackrabbit.core.observation.ObservationDispatcher - Synchronous EventConsumer threw exception.
Mar 17 11:05:27 s1720 javax.jcr.RepositoryException: failed to retrieve state of intermediary node: 133ca9cd-44b7-4725-9459-af0cc31c8fe9: 133ca9cd-44b7-4725-9459-af0cc31c8fe9
Mar 17 11:05:27 s1720 at org.apache.jackrabbit.core.HierarchyManagerImpl.resolvePath(HierarchyManagerImpl.java:329)
Mar 17 11:05:27 s1720 at org.apache.jackrabbit.core.HierarchyManagerImpl.resolvePropertyPath(HierarchyManagerImpl.java:377)
Mar 17 11:05:27 s1720 at org.hippoecm.repository.jackrabbit.HippoHierarchyManager.resolvePropertyPath(HippoHierarchyManager.java:60)
Mar 17 11:05:27 s1720 at org.hippoecm.repository.security.HippoAccessManager.getNodeId(HippoAccessManager.java:911)
Mar 17 11:05:27 s1720 at org.hippoecm.repository.security.HippoAccessManager.canRead(HippoAccessManager.java:419)
Mar 17 11:05:27 s1720 at org.apache.jackrabbit.core.observation.EventConsumer.canRead(EventConsumer.java:296)
Mar 17 11:05:27 s1720 at org.apache.jackrabbit.core.observation.EventConsumer.consumeEvents(EventConsumer.java:228)
Mar 17 11:05:27 s1720 at org.apache.jackrabbit.core.observation.ObservationDispatcher.dispatchEvents(ObservationDispatcher.java:201)
Mar 17 11:05:27 s1720 at org.apache.jackrabbit.core.state.SharedItemStateManager.externalUpdate(SharedItemStateManager.java:1129)
Mar 17 11:05:27 s1720 at org.apache.jackrabbit.core.RepositoryImpl$WorkspaceInfo.externalUpdate(RepositoryImpl.java:2098)
Mar 17 11:05:27 s1720 at org.apache.jackrabbit.core.cluster.ChangeLogRecord.process(ChangeLogRecord.java:384)
Mar 17 11:05:27 s1720 at org.apache.jackrabbit.core.journal.AbstractJournal.doSync(AbstractJournal.java:213)
Mar 17 11:05:27 s1720 at org.apache.jackrabbit.core.cluster.ClusterNode.sync(ClusterNode.java:315)
Mar 17 11:05:27 s1720 at java.lang.Thread.run(Thread.java:619)
Mar 17 11:05:27 s1720 at org.apache.jackrabbit.core.state.SessionItemStateManager.getItemState(SessionItemStateManager.java:185)
Mar 17 11:05:27 s1720 at org.apache.jackrabbit.core.ZombieHierarchyManager.getItemState(ZombieHierarchyManager.java:62)
Mar 17 11:05:27 s1720 at org.apache.jackrabbit.core.HierarchyManagerImpl.resolvePath(HierarchyManagerImpl.java:325)
Mar 17 11:05:27 s1720 ... 19 more