OptimisticLockFailedException error on "Unbound vpn service from interface" on https://git.opendaylight.org/gerrit/#/c/63951

2017-10-11 20:58:33,933 | INFO  | nPool-2-worker-3 | VpnInterfaceManager              | 344 - org.opendaylight.netvirt.vpnmanager-impl - 0.6.0.SNAPSHOT | processVpnInterfaceDown: Unbound vpn service from interface 74948951037359:br-physnet1-pa:trunk on dpn 74948951037359 for vpn 51ffd304-a57d-4b07-9a65-c64f02f9d098 successful
2017-10-11 20:58:33,934 | WARN  | d-dispatcher-118 | ShardDataTree                    | 218 - org.opendaylight.controller.sal-distributed-datastore - 1.7.0.SNAPSHOT | member-1-shard-default-operational: Store Tx member-1-datastore-operational-fe-0-txn-16823-0: Conflicting modification for path /(urn:opendaylight:netvirt:elan?revision=2015-06-02)elan-forwarding-tables/mac-table/mac-table[{(urn:opendaylight:netvirt:elan?revision=2015-06-02)elan-instance-name=51ffd304-a57d-4b07-9a65-c64f02f9d098}].
2017-10-11 20:58:33,934 | ERROR | lt-dispatcher-41 | LocalThreePhaseCommitCohort      | 218 - org.opendaylight.controller.sal-distributed-datastore - 1.7.0.SNAPSHOT | Failed to prepare transaction member-1-datastore-operational-fe-0-txn-16823-0 on backend
OptimisticLockFailedException{message=Optimistic lock failed., errorList=[RpcError [message=Optimistic lock failed., severity=ERROR, errorType=APPLICATION, tag=resource-denied, applicationTag=null, info=null, cause=org.opendaylight.yangtools.yang.data.api.schema.tree.ConflictingModificationAppliedException: Node was deleted by other transaction.]]}
	at org.opendaylight.controller.cluster.datastore.ShardDataTree.lambda$processNextPendingTransaction$0(ShardDataTree.java:731)[218:org.opendaylight.controller.sal-distributed-datastore:1.7.0.SNAPSHOT]
	at org.opendaylight.controller.cluster.datastore.ShardDataTree.processNextPending(ShardDataTree.java:769)[218:org.opendaylight.controller.sal-distributed-datastore:1.7.0.SNAPSHOT]
	at org.opendaylight.controller.cluster.datastore.ShardDataTree.processNextPendingTransaction(ShardDataTree.java:716)[218:org.opendaylight.controller.sal-distributed-datastore:1.7.0.SNAPSHOT]
	at org.opendaylight.controller.cluster.datastore.ShardDataTree.startCanCommit(ShardDataTree.java:799)[218:org.opendaylight.controller.sal-distributed-datastore:1.7.0.SNAPSHOT]
	at org.opendaylight.controller.cluster.datastore.SimpleShardDataTreeCohort.canCommit(SimpleShardDataTreeCohort.java:90)[218:org.opendaylight.controller.sal-distributed-datastore:1.7.0.SNAPSHOT]
	at org.opendaylight.controller.cluster.datastore.CohortEntry.canCommit(CohortEntry.java:97)[218:org.opendaylight.controller.sal-distributed-datastore:1.7.0.SNAPSHOT]
	at org.opendaylight.controller.cluster.datastore.ShardCommitCoordinator.handleCanCommit(ShardCommitCoordinator.java:236)[218:org.opendaylight.controller.sal-distributed-datastore:1.7.0.SNAPSHOT]
	at org.opendaylight.controller.cluster.datastore.ShardCommitCoordinator.handleReadyLocalTransaction(ShardCommitCoordinator.java:200)[218:org.opendaylight.controller.sal-distributed-datastore:1.7.0.SNAPSHOT]
	at org.opendaylight.controller.cluster.datastore.Shard.handleReadyLocalTransaction(Shard.java:729)[218:org.opendaylight.controller.sal-distributed-datastore:1.7.0.SNAPSHOT]
	at org.opendaylight.controller.cluster.datastore.Shard.handleNonRaftCommand(Shard.java:333)[218:org.opendaylight.controller.sal-distributed-datastore:1.7.0.SNAPSHOT]
	at org.opendaylight.controller.cluster.raft.RaftActor.handleCommand(RaftActor.java:270)[203:org.opendaylight.controller.sal-akka-raft:1.7.0.SNAPSHOT]
	at org.opendaylight.controller.cluster.common.actor.AbstractUntypedPersistentActor.onReceiveCommand(AbstractUntypedPersistentActor.java:44)[211:org.opendaylight.controller.sal-clustering-commons:1.7.0.SNAPSHOT]
	at akka.persistence.UntypedPersistentActor.onReceive(PersistentActor.scala:170)[37:com.typesafe.akka.persistence:2.4.18]
	at org.opendaylight.controller.cluster.common.actor.MeteringBehavior.apply(MeteringBehavior.java:104)[211:org.opendaylight.controller.sal-clustering-commons:1.7.0.SNAPSHOT]
	at akka.actor.ActorCell$$anonfun$become$1.applyOrElse(ActorCell.scala:544)[34:com.typesafe.akka.actor:2.4.18]
	at akka.actor.Actor$class.aroundReceive(Actor.scala:502)[34:com.typesafe.akka.actor:2.4.18]
	at akka.persistence.UntypedPersistentActor.akka$persistence$Eventsourced$$super$aroundReceive(PersistentActor.scala:168)[37:com.typesafe.akka.persistence:2.4.18]
	at akka.persistence.Eventsourced$$anon$1.stateReceive(Eventsourced.scala:727)[37:com.typesafe.akka.persistence:2.4.18]
	at akka.persistence.Eventsourced$class.aroundReceive(Eventsourced.scala:183)[37:com.typesafe.akka.persistence:2.4.18]
	at akka.persistence.UntypedPersistentActor.aroundReceive(PersistentActor.scala:168)[37:com.typesafe.akka.persistence:2.4.18]
	at akka.actor.ActorCell.receiveMessage(ActorCell.scala:526)[34:com.typesafe.akka.actor:2.4.18]
	at akka.actor.ActorCell.invoke(ActorCell.scala:495)[34:com.typesafe.akka.actor:2.4.18]
	at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257)[34:com.typesafe.akka.actor:2.4.18]
	at akka.dispatch.Mailbox.run(Mailbox.scala:224)[34:com.typesafe.akka.actor:2.4.18]
	at akka.dispatch.Mailbox.exec(Mailbox.scala:234)[34:com.typesafe.akka.actor:2.4.18]
	at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)[413:org.scala-lang.scala-library:2.11.11.v20170413-090219-8a413ba7cc]
	at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)[413:org.scala-lang.scala-library:2.11.11.v20170413-090219-8a413ba7cc]
	at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)[413:org.scala-lang.scala-library:2.11.11.v20170413-090219-8a413ba7cc]
	at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)[413:org.scala-lang.scala-library:2.11.11.v20170413-090219-8a413ba7cc]
Caused by: org.opendaylight.yangtools.yang.data.api.schema.tree.ConflictingModificationAppliedException: Node was deleted by other transaction.
	at org.opendaylight.yangtools.yang.data.impl.schema.tree.AbstractNodeContainerModificationStrategy.checkTouchApplicable(AbstractNodeContainerModificationStrategy.java:285)[394:org.opendaylight.yangtools.yang-data-impl:1.2.0]
	at org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaAwareApplyOperation.checkApplicable(SchemaAwareApplyOperation.java:125)[394:org.opendaylight.yangtools.yang-data-impl:1.2.0]
	at org.opendaylight.yangtools.yang.data.impl.schema.tree.AbstractNodeContainerModificationStrategy.checkChildPreconditions(AbstractNodeContainerModificationStrategy.java:305)[394:org.opendaylight.yangtools.yang-data-impl:1.2.0]
	at org.opendaylight.yangtools.yang.data.impl.schema.tree.AbstractNodeContainerModificationStrategy.checkTouchApplicable(AbstractNodeContainerModificationStrategy.java:288)[394:org.opendaylight.yangtools.yang-data-impl:1.2.0]
	at org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaAwareApplyOperation.checkApplicable(SchemaAwareApplyOperation.java:125)[394:org.opendaylight.yangtools.yang-data-impl:1.2.0]
	at org.opendaylight.yangtools.yang.data.impl.schema.tree.AbstractNodeContainerModificationStrategy.checkChildPreconditions(AbstractNodeContainerModificationStrategy.java:305)[394:org.opendaylight.yangtools.yang-data-impl:1.2.0]
	at org.opendaylight.yangtools.yang.data.impl.schema.tree.AbstractNodeContainerModificationStrategy.checkTouchApplicable(AbstractNodeContainerModificationStrategy.java:288)[394:org.opendaylight.yangtools.yang-data-impl:1.2.0]
	at org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaAwareApplyOperation.checkApplicable(SchemaAwareApplyOperation.java:125)[394:org.opendaylight.yangtools.yang-data-impl:1.2.0]
	at org.opendaylight.yangtools.yang.data.impl.schema.tree.StructuralContainerModificationStrategy.checkApplicable(StructuralContainerModificationStrategy.java:99)[394:org.opendaylight.yangtools.yang-data-impl:1.2.0]
	at org.opendaylight.yangtools.yang.data.impl.schema.tree.AbstractNodeContainerModificationStrategy.checkChildPreconditions(AbstractNodeContainerModificationStrategy.java:305)[394:org.opendaylight.yangtools.yang-data-impl:1.2.0]
	at org.opendaylight.yangtools.yang.data.impl.schema.tree.AbstractNodeContainerModificationStrategy.checkTouchApplicable(AbstractNodeContainerModificationStrategy.java:288)[394:org.opendaylight.yangtools.yang-data-impl:1.2.0]
	at org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaAwareApplyOperation.checkApplicable(SchemaAwareApplyOperation.java:125)[394:org.opendaylight.yangtools.yang-data-impl:1.2.0]
	at org.opendaylight.yangtools.yang.data.impl.schema.tree.RootModificationApplyOperation.checkApplicable(RootModificationApplyOperation.java:72)[394:org.opendaylight.yangtools.yang-data-impl:1.2.0]
	at org.opendaylight.yangtools.yang.data.impl.schema.tree.AbstractDataTreeTip.validate(AbstractDataTreeTip.java:35)[394:org.opendaylight.yangtools.yang-data-impl:1.2.0]
	at org.opendaylight.controller.cluster.datastore.ShardDataTree.lambda$processNextPendingTransaction$0(ShardDataTree.java:723)[218:org.opendaylight.controller.sal-distributed-datastore:1.7.0.SNAPSHOT]
	... 28 more