public void Handle(ElectionMessage.ViewChange message)
{
if (_state == ElectionsState.Shutdown)
{
return;
}
if (_state == ElectionsState.Idle)
{
return;
}
if (message.AttemptedView <= _lastInstalledView)
{
return;
}
Log.Debug("ELECTIONS: (V={view}) VIEWCHANGE FROM [{serverInternalHttp}, {serverId:B}].",
message.AttemptedView, message.ServerInternalHttp, message.ServerId);
if (message.AttemptedView > _lastAttemptedView)
{
ShiftToLeaderElection(message.AttemptedView);
}
if (_vcReceived.Add(message.ServerId) && _vcReceived.Count == _clusterSize / 2 + 1)
{
Log.Debug("ELECTIONS: (V={view}) MAJORITY OF VIEWCHANGE.", message.AttemptedView);
if (AmILeaderOf(_lastAttemptedView))
{
ShiftToPreparePhase();
}
}
}
public void SendViewChange(ElectionMessage.ViewChange msg, EndPoint destinationEndpoint, DateTime deadline)
{
SendViewChangeAsync(msg.ServerId, msg.ServerHttpEndPoint, msg.AttemptedView, deadline).ContinueWith(r => {
if (r.Exception != null)
{
Log.Information(r.Exception, "View Change Send Failed to {Server}", destinationEndpoint);
}
});
}
private void ShiftToLeaderElection(int view)
{
Log.Debug("ELECTIONS: (V={view}) SHIFT TO LEADER ELECTION.", view);
_state = ElectionsState.ElectingLeader;
_vcReceived.Clear();
_prepareOkReceived.Clear();
_lastAttemptedView = view;
_masterProposal = null;
_master = null;
_acceptsReceived.Clear();
var viewChangeMsg = new ElectionMessage.ViewChange(_nodeInfo.InstanceId, _nodeInfo.InternalHttp, view);
Handle(viewChangeMsg);
SendToAllExceptMe(viewChangeMsg);
_publisher.Publish(TimerMessage.Schedule.Create(LeaderElectionProgressTimeout,
_publisherEnvelope,
new ElectionMessage.ElectionsTimedOut(view)));
}
