Cluster HA test: 500 Server Error when failed owner instance is recovered

https://jenkins.opendaylight.org/releng/job/openflowplugin-csit-verify-3node-clustering-helium-design/12/robot/report/log.html

I see this ERROR very often when I recover a failed owner instance and try to do a PUT/GET operation in the datastore:

{"errors":{"error":[

{"error-type":"application","error-tag":"operation-failed","error-message":"canCommit encountered an unexpected failure","error-info":"java.lang.Exception: Error creating READ_WRITE transaction on shard inventory\n\tat org.opendaylight.controller.cluster.datastore.RemoteTransactionContextSupport.createTransactionContext(RemoteTransactionContextSupport.java:222)\n\tat org.opendaylight.controller.cluster.datastore.RemoteTransactionContextSupport.onCreateTransactionComplete(RemoteTransactionContextSupport.java:200)\n\tat org.opendaylight.controller.cluster.datastore.RemoteTransactionContextSupport.access$000(RemoteTransactionContextSupport.java:40)\n\tat org.opendaylight.controller.cluster.datastore.RemoteTransactionContextSupport$1.onComplete(RemoteTransactionContextSupport.java:135)\n\tat akka.dispatch.OnComplete.internal(Future.scala:247)\n\tat akka.dispatch.OnComplete.internal(Future.scala:245)\n\tat akka.dispatch.japi$CallbackBridge.apply(Future.scala:175)\n\tat akka.dispatch.japi$CallbackBridge.apply(Future.scala:172)\n\tat scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32)\n\tat akka.dispatch.BatchingExecutor$AbstractBatch.processBatch(BatchingExecutor.scala:55)\n\tat akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply$mcV$sp(BatchingExecutor.scala:91)\n\tat akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply(BatchingExecutor.scala:91)\n\tat akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply(BatchingExecutor.scala:91)\n\tat scala.concurrent.BlockContext$.withBlockContext(BlockContext.scala:72)\n\tat akka.dispatch.BatchingExecutor$BlockableBatch.run(BatchingExecutor.scala:90)\n\tat akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:40)\n\tat akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:397)\n\tat scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)\n\tat scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)\n\tat scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)\n\tat scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)\nCaused by: akka.actor.InvalidActorNameException: actor name [shard-member-1-txn-21] is not unique!\n\tat akka.actor.dungeon.ChildrenContainer$NormalChildrenContainer.reserve(ChildrenContainer.scala:130)\n\tat akka.actor.dungeon.Children$class.reserveChild(Children.scala:76)\n\tat akka.actor.ActorCell.reserveChild(ActorCell.scala:369)\n\tat akka.actor.dungeon.Children$class.makeChild(Children.scala:201)\n\tat akka.actor.dungeon.Children$class.actorOf(Children.scala:37)\n\tat akka.actor.ActorCell.actorOf(ActorCell.scala:369)\n\tat org.opendaylight.controller.cluster.datastore.ShardTransactionActorFactory.newShardTransaction(ShardTransactionFactory.java:60)\n\tat org.opendaylight.controller.cluster.datastore.Shard.createTypedTransactionActor(Shard.java:538)\n\tat org.opendaylight.controller.cluster.datastore.Shard.createTransaction(Shard.java:570)\n\tat org.opendaylight.controller.cluster.datastore.Shard.createTransaction(Shard.java:549)\n\tat org.opendaylight.controller.cluster.datastore.Shard.handleCreateTransaction(Shard.java:521)\n\tat org.opendaylight.controller.cluster.datastore.Shard.onReceiveCommand(Shard.java:230)\n\tat akka.persistence.UntypedPersistentActor.onReceive(Eventsourced.scala:430)\n\tat org.opendaylight.controller.cluster.common.actor.MeteringBehavior.apply(MeteringBehavior.java:97)\n\tat akka.actor.ActorCell$$anonfun$become$1.applyOrElse(ActorCell.scala:534)\n\tat akka.persistence.Recovery$State$class.process(Recovery.scala:30)\n\tat akka.persistence.ProcessorImpl$$anon$2.process(Processor.scala:103)\n\tat akka.persistence.ProcessorImpl$$anon$2.aroundReceive(Processor.scala:114)\n\tat akka.persistence.Recovery$class.aroundReceive(Recovery.scala:265)\n\tat akka.persistence.UntypedPersistentActor.akka$persistence$Eventsourced$$super$aroundReceive(Eventsourced.scala:428)\n\tat akka.persistence.Eventsourced$$anon$2.doAroundReceive(Eventsourced.scala:82)\n\tat akka.persistence.Eventsourced$$anon$2.aroundReceive(Eventsourced.scala:78)\n\tat akka.persistence.Eventsourced$class.aroundReceive(Eventsourced.scala:369)\n\tat akka.persistence.UntypedPersistentActor.aroundReceive(Eventsourced.scala:428)\n\tat akka.actor.ActorCell.receiveMessage(ActorCell.scala:516)\n\tat akka.actor.ActorCell.invoke(ActorCell.scala:487)\n\tat akka.dispatch.Mailbox.processMailbox(Mailbox.scala:238)\n\tat akka.dispatch.Mailbox.run(Mailbox.scala:220)\n\t... 5 more\n"}

]}}