public void handleAppendEntries(AppendEntries appendEntries, IActorRef sender)
{
//If we get an append entries message while being a candidate
//Go back to become a follower
this.node.setState(this.node.followerState);
this.node.followerState.handleAppendEntries(appendEntries, sender);
}
public void handleAppendEntries(AppendEntries appendEntries, IActorRef sender)
{
//Save the info of the leader
this.node.setLeaderReference(sender);
//Process the entries from the leader
this.node.appendEntriesFromLeader(appendEntries, sender);
//this.node.log.Info(string.Concat("Follower ", this.node.nodeId, " received Append Entries message."));
this.node.resetElectionTimer();
}
public void appendEntriesFromLeader(AppendEntries appendEntries, IActorRef leader)
{
//Reply false if term < currentTerm
//Reply false if log does not contain an entry at prevLogIndex whose term matches prevLogTerm
if (appendEntries.term < this.currentTerm ||
this.logEntries.getLastLogIndex() < appendEntries.prevLogIndex ||
(appendEntries.prevLogIndex > 0 && this.logEntries.getLogEntryTerm(appendEntries.prevLogIndex) != appendEntries.prevLogTerm))
{
leader.Tell(new AppendEntriesResponse(this.currentTerm, false, 0));
return;
}
//If an existing entry conflicts with a new one (same index but different terms), delete the existing entry and all that follow it
int startingIndexToRemove = this.logEntries.getLastLogIndex() + 1;
foreach (LogEntry entry in appendEntries.entries)
{
if (this.logEntries.getLogEntryTerm(entry.index) != entry.term)
{
startingIndexToRemove = entry.index;
break;
}
}
//Remove
if (startingIndexToRemove <= this.logEntries.getLastLogIndex())
{
this.logEntries.removeEntriesFromIndex(startingIndexToRemove);
}
//Append the missing entries
foreach (LogEntry entry in appendEntries.entries)
{
if (entry.index <= this.logEntries.getLastLogIndex())
{
continue;
}
//For followers, default responseSent to true, it's the leader's job
this.logEntries.append(entry.term, entry.quantity, entry.command, entry.clientActorPath, true, entry.giveUpForFrontEndPath);
}
this.updatePersistentStorage();
//Tell the leader it has been successful
leader.Tell(new AppendEntriesResponse(this.currentTerm, true, this.logEntries.getLastLogIndex()));
//Update the commit index
if (this.commitIndex < appendEntries.commitIndex)
{
this.setCommitIndex(appendEntries.commitIndex);
}
this.updateLastApplied();
//Recompute the tentative state
this.stateMachine.recomputeTentativeState(this.logEntries.getEntriesFromIndex(this.lastApplied + 1));
}
public void handleAppendEntries(AppendEntries appendEntries, IActorRef sender)
{
//If the appendEntries term is > this term, the checkTerm function already makes this node step down
}
