import akka.actor.ActorRef;
import akka.actor.Cancellable;
+import akka.event.LoggingAdapter;
import org.opendaylight.controller.cluster.raft.ClientRequestTracker;
import org.opendaylight.controller.cluster.raft.RaftActorContext;
-import org.opendaylight.controller.cluster.raft.RaftState;
import org.opendaylight.controller.cluster.raft.ReplicatedLogEntry;
-import org.opendaylight.controller.cluster.raft.internal.messages.ApplyState;
-import org.opendaylight.controller.cluster.raft.internal.messages.ElectionTimeout;
+import org.opendaylight.controller.cluster.raft.SerializationUtils;
+import org.opendaylight.controller.cluster.raft.base.messages.ApplyLogEntries;
+import org.opendaylight.controller.cluster.raft.base.messages.ApplyState;
+import org.opendaylight.controller.cluster.raft.base.messages.ElectionTimeout;
import org.opendaylight.controller.cluster.raft.messages.AppendEntries;
import org.opendaylight.controller.cluster.raft.messages.AppendEntriesReply;
import org.opendaylight.controller.cluster.raft.messages.RequestVote;
protected final RaftActorContext context;
/**
- * The maximum election time variance
- */
- private static final int ELECTION_TIME_MAX_VARIANCE = 100;
-
- /**
- * The interval at which a heart beat message will be sent to the remote
- * RaftActor
- * <p/>
- * Since this is set to 100 milliseconds the Election timeout should be
- * at least 200 milliseconds
- */
- protected static final FiniteDuration HEART_BEAT_INTERVAL =
- new FiniteDuration(100, TimeUnit.MILLISECONDS);
-
- /**
- * The interval in which a new election would get triggered if no leader is found
+ *
*/
- private static final long ELECTION_TIME_INTERVAL =
- HEART_BEAT_INTERVAL.toMillis() * 2;
+ protected final LoggingAdapter LOG;
/**
*
protected AbstractRaftActorBehavior(RaftActorContext context) {
this.context = context;
+ this.LOG = context.getLogger();
}
/**
* @param appendEntries The AppendEntries message
* @return
*/
- protected abstract RaftState handleAppendEntries(ActorRef sender,
+ protected abstract RaftActorBehavior handleAppendEntries(ActorRef sender,
AppendEntries appendEntries);
* @param appendEntries
* @return
*/
- protected RaftState appendEntries(ActorRef sender,
+ protected RaftActorBehavior appendEntries(ActorRef sender,
AppendEntries appendEntries) {
// 1. Reply false if term < currentTerm (§5.1)
if (appendEntries.getTerm() < currentTerm()) {
- context.getLogger().debug(
- "Cannot append entries because sender term " + appendEntries
- .getTerm() + " is less than " + currentTerm());
+ if(LOG.isDebugEnabled()) {
+ LOG.debug("Cannot append entries because sender term {} is less than {}",
+ appendEntries.getTerm(), currentTerm());
+ }
+
sender.tell(
new AppendEntriesReply(context.getId(), currentTerm(), false,
lastIndex(), lastTerm()), actor()
);
- return state();
+ return this;
}
* @param appendEntriesReply The AppendEntriesReply message
* @return
*/
- protected abstract RaftState handleAppendEntriesReply(ActorRef sender,
+ protected abstract RaftActorBehavior handleAppendEntriesReply(ActorRef sender,
AppendEntriesReply appendEntriesReply);
/**
* @param requestVote
* @return
*/
- protected RaftState requestVote(ActorRef sender,
+ protected RaftActorBehavior requestVote(ActorRef sender,
RequestVote requestVote) {
+ if(LOG.isDebugEnabled()) {
+ LOG.debug(requestVote.toString());
+ }
+
boolean grantVote = false;
// Reply false if term < currentTerm (§5.1)
sender.tell(new RequestVoteReply(currentTerm(), grantVote), actor());
- return state();
+ return this;
}
/**
* @param requestVoteReply The RequestVoteReply message
* @return
*/
- protected abstract RaftState handleRequestVoteReply(ActorRef sender,
+ protected abstract RaftActorBehavior handleRequestVoteReply(ActorRef sender,
RequestVoteReply requestVoteReply);
/**
* @return
*/
protected FiniteDuration electionDuration() {
- long variance = new Random().nextInt(ELECTION_TIME_MAX_VARIANCE);
- return new FiniteDuration(ELECTION_TIME_INTERVAL + variance,
- TimeUnit.MILLISECONDS);
+ long variance = new Random().nextInt(context.getConfigParams().getElectionTimeVariance());
+ return context.getConfigParams().getElectionTimeOutInterval().$plus(
+ new FiniteDuration(variance, TimeUnit.MILLISECONDS));
}
/**
return null;
}
+ /**
+ * Find the client request tracker for a specific logIndex
+ *
+ * @param logIndex
+ * @return
+ */
+ protected ClientRequestTracker removeClientRequestTracker(long logIndex) {
+ return null;
+ }
+
+
/**
* Find the log index from the previous to last entry in the log
*
*
* @param index a log index that is known to be committed
*/
- protected void applyLogToStateMachine(long index) {
+ protected void applyLogToStateMachine(final long index) {
+ long newLastApplied = context.getLastApplied();
// Now maybe we apply to the state machine
for (long i = context.getLastApplied() + 1;
i < index + 1; i++) {
ActorRef clientActor = null;
String identifier = null;
- ClientRequestTracker tracker = findClientRequestTracker(i);
+ ClientRequestTracker tracker = removeClientRequestTracker(i);
if (tracker != null) {
clientActor = tracker.getClientActor();
context.getReplicatedLog().get(i);
if (replicatedLogEntry != null) {
+ // Send a local message to the local RaftActor (it's derived class to be
+ // specific to apply the log to it's index)
actor().tell(new ApplyState(clientActor, identifier,
replicatedLogEntry), actor());
+ newLastApplied = i;
} else {
- context.getLogger().error(
- "Missing index " + i + " from log. Cannot apply state.");
+ //if one index is not present in the log, no point in looping
+ // around as the rest wont be present either
+ LOG.warning(
+ "Missing index {} from log. Cannot apply state. Ignoring {} to {}", i, i, index);
+ break;
}
}
- // Send a local message to the local RaftActor (it's derived class to be
- // specific to apply the log to it's index)
- context.setLastApplied(index);
+ if(LOG.isDebugEnabled()) {
+ LOG.debug("Setting last applied to {}", newLastApplied);
+ }
+ context.setLastApplied(newLastApplied);
+
+ // send a message to persist a ApplyLogEntries marker message into akka's persistent journal
+ // will be used during recovery
+ //in case if the above code throws an error and this message is not sent, it would be fine
+ // as the append entries received later would initiate add this message to the journal
+ actor().tell(new ApplyLogEntries((int) context.getLastApplied()), actor());
+ }
+
+ protected Object fromSerializableMessage(Object serializable){
+ return SerializationUtils.fromSerializable(serializable);
}
@Override
- public RaftState handleMessage(ActorRef sender, Object message) {
+ public RaftActorBehavior handleMessage(ActorRef sender, Object message) {
if (message instanceof AppendEntries) {
return appendEntries(sender, (AppendEntries) message);
} else if (message instanceof AppendEntriesReply) {
} else if (message instanceof RequestVoteReply) {
return handleRequestVoteReply(sender, (RequestVoteReply) message);
}
- return state();
+ return this;
}
@Override public String getLeaderId() {
return leaderId;
}
+
+ protected RaftActorBehavior switchBehavior(RaftActorBehavior behavior) {
+ LOG.info("Switching from behavior {} to {}", this.state(), behavior.state());
+ try {
+ close();
+ } catch (Exception e) {
+ LOG.error(e, "Failed to close behavior : {}", this.state());
+ }
+
+ return behavior;
+ }
}
Code Review / controller.git / blobdiff