Attempting to fetch data from the second follower in a 3-node cluster when original owner is down, causes a java exception to be returned in the response text:

<errors xmlns="urn:ietf:params:xml:ns:yang:ietf-restconf"><error><error-type>application</error-type><error-tag>operation-failed</error-tag><error-message>Problem to get data from transaction.</error-message><error-info>akka.pattern.AskTimeoutException: Ask timed out on [Actor[akka.tcp://opendaylight-cluster-data@10.29.11.243:2550/user/topology-netconf/netconf-test-device/mountpoint#1234942408]] after [5000 ms]
at akka.pattern.PromiseActorRef$$anonfun$1.apply$mcV$sp(AskSupport.scala:334)
at akka.actor.Scheduler$$anon$7.run(Scheduler.scala:117)
at scala.concurrent.Future$InternalCallbackExecutor$.unbatchedExecute(Future.scala:599)
at scala.concurrent.BatchingExecutor$class.execute(BatchingExecutor.scala:109)
at scala.concurrent.Future$InternalCallbackExecutor$.execute(Future.scala:597)
at akka.actor.LightArrayRevolverScheduler$TaskHolder.executeTask(Scheduler.scala:467)
at akka.actor.LightArrayRevolverScheduler$$anon$8.executeBucket$1(Scheduler.scala:419)
at akka.actor.LightArrayRevolverScheduler$$anon$8.nextTick(Scheduler.scala:423)
at akka.actor.LightArrayRevolverScheduler$$anon$8.run(Scheduler.scala:375)
at java.lang.Thread.run(Thread.java:745)
</error-info></error></errors>

The response code returned is 500.
The URI requested was: /restconf/config/network-topology:network-topology/topology/topology-netconf/node/netconf-test-device/yang-ext:mount

The request is successful when the first follower (the new owner) is querried

Sandbox test results: https://jenkins.opendaylight.org/sandbox/job/netconf-csit-3node-clustering-only-beryllium/3/

Test to look for is in "Entity" suite under the name "Check_Config_Data_Before_Modification_With_Original_Owner_Down"