// processes ack for appenentries
// keeps track of other nodes
// update commit index
internal override void ProcessAppendEntriesAck(AppendEntriesAck appendEntriesAck)
{
this.Logger.TraceFormat("Received AppendEntriesAck ({0}).", appendEntriesAck);
if (appendEntriesAck.Term > this.CurrentTerm)
{
this.Logger.DebugFormat("Term is higher, I resign.");
this.Node.SwitchTo(NodeStatus.Follower);
return;
}
string followerId = appendEntriesAck.NodeId;
var followerLogState = this.states[followerId];
followerLogState.ProcessAppendEntriesAck(appendEntriesAck.Success);
var message = followerLogState.GetAppendEntries(this.Node.State.LogEntries);
if (appendEntriesAck.Success)
{
this.UpdateCommitIndex();
}
if (message == null)
{
return;
}
message.LeaderId = this.Node.Id;
message.LeaderTerm = this.CurrentTerm;
message.CommitIndex = this.Node.LastCommit;
this.Node.SendMessage(followerId, message);
}
internal override void ProcessAppendEntries(AppendEntries <T> appendEntries)
{
if (appendEntries.LeaderTerm >= this.CurrentTerm)
{
this.Logger.InfoFormat(
"Received AppendEntries from a probable leader, stepping down ({0}).",
appendEntries);
this.Node.SwitchToAndProcessMessage(NodeStatus.Follower, appendEntries);
}
else
{
Logger.Debug("Received AppendEntries from an invalid leader, refusing.");
var reply = new AppendEntriesAck(this.Node.Id, this.CurrentTerm, false);
this.Node.SendMessage(appendEntries.LeaderId, reply);
}
}
internal override void ProcessAppendEntries(AppendEntries <T> appendEntries)
{
bool result;
if (appendEntries.LeaderTerm < this.CurrentTerm)
{
// leader is older than us or log does not match
this.Logger.DebugFormat(
"Reject an AppendEntries from an invalid leader ({0}).", appendEntries);
result = false;
}
else
{
// we will proceed
this.Node.LeaderId = appendEntries.LeaderId;
if (appendEntries.LeaderTerm > this.CurrentTerm)
{
this.Logger.TraceFormat("Upgrade our term to {0}.", this.CurrentTerm);
this.Node.State.CurrentTerm = appendEntries.LeaderTerm;
}
if (this.Node.State.EntryMatches(
appendEntries.PrevLogIndex, appendEntries.PrevLogTerm))
{
this.Logger.TraceFormat(
"Process an AppendEntries request: {0}", appendEntries);
this.Node.State.AppendEntries(appendEntries.PrevLogIndex, appendEntries.Entries);
this.Node.Commit(appendEntries.CommitIndex);
result = true;
}
else
{
// log does not match, we are not in sync with leader yet
this.Logger.DebugFormat(
"Reject an AppendEntries that does not match our log ({0}).",
appendEntries);
result = false;
}
}
var reply = new AppendEntriesAck(this.Node.Id, this.CurrentTerm, result);
this.Node.SendMessage(appendEntries.LeaderId, reply);
this.ResetTimeout(.2);
}
internal virtual void ProcessAppendEntriesAck(AppendEntriesAck appendEntriesAck)
{
this.Logger.WarnFormat(
"Received ProcessAppendEntriesAck but I am not a leader, discarded: {0}",
appendEntriesAck);
}
