public void CanProperlySnapshot() { using (var state = new PersistentState("self", StorageEnvironmentOptions.CreateMemoryOnly(), CancellationToken.None) { CommandSerializer = new JsonCommandSerializer() }) { state.UpdateTermTo(null, 1); state.AppendToLeaderLog(new NopCommand()); for (int i = 0; i < 5; i++) { state.AppendToLeaderLog(new DictionaryCommand.Set { Key = i.ToString(), Value = i }); } state.MarkSnapshotFor(6, 1, 5); state.AppendToLeaderLog(new DictionaryCommand.Set { Key = "1", Value = 4 }); var lastLogEntry = state.LastLogEntry(); Assert.Equal(7, lastLogEntry.Index); } }
public RaftEngine(RaftEngineOptions raftEngineOptions) { //#if DEBUG // Console.WriteLine("Press any key to continue loading Raft -> opportunity to attach debugger"); // Console.ReadLine(); //#endif _raftEngineOptions = raftEngineOptions; Debug.Assert(raftEngineOptions.Stopwatch != null); _log = LogManager.GetLogger(raftEngineOptions.Name + "." + GetType().FullName); _eventLoopCancellationTokenSource = new CancellationTokenSource(); Name = raftEngineOptions.Name; PersistentState = new PersistentState(raftEngineOptions.Name, raftEngineOptions.StorageOptions, _eventLoopCancellationTokenSource.Token) { CommandSerializer = new JsonCommandSerializer() }; _currentTopology = PersistentState.GetCurrentTopology(); //warm up to make sure that the serializer don't take too long and force election timeout PersistentState.CommandSerializer.Serialize(new NopCommand()); var thereAreOthersInTheCluster = CurrentTopology.QuorumSize > 1; if (thereAreOthersInTheCluster == false && CurrentTopology.IsVoter(Name)) { PersistentState.UpdateTermTo(this, PersistentState.CurrentTerm + 1);// restart means new term SetState(RaftEngineState.Leader); } else { SetState(RaftEngineState.Follower); } _commitIndex = StateMachine.LastAppliedIndex; _eventLoopTask = Task.Run(() => EventLoop()); }