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());
}
