+ return newServerInfoList;
+ }
+ }
+
+ private class WaitingForLeaderElected extends OperationState {
+ private final ServerConfigurationPayload previousServerConfig;
+ private final ChangeServersVotingStatusContext operationContext;
+ private final Cancellable timer;
+
+ WaitingForLeaderElected(ChangeServersVotingStatusContext operationContext,
+ ServerConfigurationPayload previousServerConfig) {
+ this.operationContext = operationContext;
+ this.previousServerConfig = previousServerConfig;
+
+ timer = newTimer(raftContext.getConfigParams().getElectionTimeOutInterval(),
+ new ServerOperationTimeout(operationContext.getLoggingContext()));
+ }
+
+ @Override
+ void onNewLeader(String newLeader) {
+ if (newLeader == null) {
+ return;
+ }
+
+ LOG.debug("{}: New leader {} elected", raftContext.getId(), newLeader);
+
+ timer.cancel();
+
+ if (raftActor.isLeader()) {
+ persistNewServerConfiguration(operationContext);
+ } else {
+ // Edge case - some other node became leader so forward the operation.
+ LOG.debug("{}: Forwarding {} to new leader", raftContext.getId(), operationContext.getOperation());
+
+ // Revert the local server config change.
+ raftContext.updatePeerIds(previousServerConfig);
+
+ changeToIdleState();
+ RaftActorServerConfigurationSupport.this.onNewOperation(operationContext);
+ }
+ }
+
+ @Override
+ void onServerOperationTimeout(ServerOperationTimeout timeout) {
+ LOG.warn("{}: Leader election timed out - cannot apply operation {}",
+ raftContext.getId(), timeout.getLoggingContext());
+
+ // Revert the local server config change.
+ raftContext.updatePeerIds(previousServerConfig);
+ raftActor.initializeBehavior();
+
+ tryToForwardOperationToAnotherServer();
+ }
+
+ private void tryToForwardOperationToAnotherServer() {
+ Collection<String> serversVisited = new HashSet<>(operationContext.getOperation().getServersVisited());
+
+ LOG.debug("{}: tryToForwardOperationToAnotherServer - servers already visited {}", raftContext.getId(),
+ serversVisited);