X-Git-Url: https://git.opendaylight.org/gerrit/gitweb?p=controller.git;a=blobdiff_plain;f=opendaylight%2Fmd-sal%2Fsal-akka-raft%2Fsrc%2Fmain%2Fjava%2Forg%2Fopendaylight%2Fcontroller%2Fcluster%2Fraft%2Fbehaviors%2FCandidate.java;h=52ed26758ee26b6f9949fa1202f1a44628b82364;hp=72e8e8c2a70b50ed5022b392918bbadc58697eba;hb=bad1f8b8f3c1780cd37ec8a817ef4b0f23901654;hpb=6f55265c68cbd7e231b48cfb1e6a2313d6680285

diff --git a/opendaylight/md-sal/sal-akka-raft/src/main/java/org/opendaylight/controller/cluster/raft/behaviors/Candidate.java b/opendaylight/md-sal/sal-akka-raft/src/main/java/org/opendaylight/controller/cluster/raft/behaviors/Candidate.java
index 72e8e8c2a7..52ed26758e 100644
--- a/opendaylight/md-sal/sal-akka-raft/src/main/java/org/opendaylight/controller/cluster/raft/behaviors/Candidate.java
+++ b/opendaylight/md-sal/sal-akka-raft/src/main/java/org/opendaylight/controller/cluster/raft/behaviors/Candidate.java
@@ -70,11 +70,20 @@ public class Candidate extends AbstractRaftActorBehavior {
         } else {
             scheduleElection(electionDuration());
         }
+    }
 
+    @Override
+    public final String getLeaderId() {
+        return null;
+    }
 
+    @Override
+    public final short getLeaderPayloadVersion() {
+        return -1;
     }
 
-    @Override protected RaftActorBehavior handleAppendEntries(ActorRef sender,
+    @Override
+    protected RaftActorBehavior handleAppendEntries(ActorRef sender,
         AppendEntries appendEntries) {
 
         if(LOG.isDebugEnabled()) {
@@ -92,33 +101,51 @@ public class Candidate extends AbstractRaftActorBehavior {
         return this;
     }
 
-    @Override protected RaftActorBehavior handleAppendEntriesReply(ActorRef sender,
-        AppendEntriesReply appendEntriesReply) {
-
+    @Override
+    protected RaftActorBehavior handleAppendEntriesReply(ActorRef sender, AppendEntriesReply appendEntriesReply) {
         return this;
     }
 
-    @Override protected RaftActorBehavior handleRequestVoteReply(ActorRef sender,
-            RequestVoteReply requestVoteReply) {
-
-        LOG.debug("{}: handleRequestVoteReply: {}, current voteCount: {}", logName(), requestVoteReply,
-                voteCount);
+    @Override
+    protected RaftActorBehavior handleRequestVoteReply(ActorRef sender, RequestVoteReply requestVoteReply) {
+        LOG.debug("{}: handleRequestVoteReply: {}, current voteCount: {}", logName(), requestVoteReply, voteCount);
 
         if (requestVoteReply.isVoteGranted()) {
             voteCount++;
         }
 
         if (voteCount >= votesRequired) {
-            return internalSwitchBehavior(RaftState.Leader);
+            if(context.getCommitIndex() < context.getReplicatedLog().lastIndex()) {
+                LOG.debug("{}: Connmit index {} is behind last index {}", logName(), context.getCommitIndex(),
+                        context.getReplicatedLog().lastIndex());
+                return internalSwitchBehavior(RaftState.PreLeader);
+            } else {
+                return internalSwitchBehavior(RaftState.Leader);
+            }
         }
 
         return this;
     }
 
     @Override
-    public RaftActorBehavior handleMessage(ActorRef sender, Object originalMessage) {
+    public RaftActorBehavior handleMessage(ActorRef sender, Object message) {
+        if (message instanceof ElectionTimeout) {
+            LOG.debug("{}: Received ElectionTimeout", logName());
 
-        Object message = fromSerializableMessage(originalMessage);
+            if (votesRequired == 0) {
+                // If there are no peers then we should be a Leader
+                // We wait for the election timeout to occur before declare
+                // ourselves the leader. This gives enough time for a leader
+                // who we do not know about (as a peer)
+                // to send a message to the candidate
+
+                return internalSwitchBehavior(RaftState.Leader);
+            }
+
+            startNewTerm();
+            scheduleElection(electionDuration());
+            return this;
+        }
 
         if (message instanceof RaftRPC) {
 
@@ -135,25 +162,14 @@ public class Candidate extends AbstractRaftActorBehavior {
             if (rpc.getTerm() > context.getTermInformation().getCurrentTerm()) {
                 context.getTermInformation().updateAndPersist(rpc.getTerm(), null);
 
-                return internalSwitchBehavior(RaftState.Follower);
-            }
-        }
-
-        if (message instanceof ElectionTimeout) {
-            LOG.debug("{}: Received ElectionTimeout", logName());
-
-            if (votesRequired == 0) {
-                // If there are no peers then we should be a Leader
-                // We wait for the election timeout to occur before declare
-                // ourselves the leader. This gives enough time for a leader
-                // who we do not know about (as a peer)
-                // to send a message to the candidate
+                // The raft paper does not say whether or not a Candidate can/should process a RequestVote in
+                // this case but doing so gains quicker convergence when the sender's log is more up-to-date.
+                if (message instanceof RequestVote) {
+                    super.handleMessage(sender, message);
+                }
 
-                return internalSwitchBehavior(RaftState.Leader);
+                return internalSwitchBehavior(RaftState.Follower);
             }
-            startNewTerm();
-            scheduleElection(electionDuration());
-            return this;
         }
 
         return super.handleMessage(sender, message);