import akka.persistence.SaveSnapshotSuccess;
import akka.persistence.SnapshotOffer;
import akka.persistence.SnapshotSelectionCriteria;
-import akka.persistence.UntypedPersistentActor;
+import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Optional;
import com.google.common.base.Stopwatch;
import com.google.protobuf.ByteString;
+import java.io.Serializable;
+import java.util.Map;
+import org.opendaylight.controller.cluster.DataPersistenceProvider;
+import org.opendaylight.controller.cluster.common.actor.AbstractUntypedPersistentActor;
+import org.opendaylight.controller.cluster.notifications.RoleChanged;
import org.opendaylight.controller.cluster.raft.base.messages.ApplyLogEntries;
import org.opendaylight.controller.cluster.raft.base.messages.ApplySnapshot;
import org.opendaylight.controller.cluster.raft.base.messages.ApplyState;
import org.opendaylight.controller.cluster.raft.base.messages.CaptureSnapshotReply;
import org.opendaylight.controller.cluster.raft.base.messages.Replicate;
import org.opendaylight.controller.cluster.raft.base.messages.SendHeartBeat;
+import org.opendaylight.controller.cluster.raft.base.messages.SendInstallSnapshot;
+import org.opendaylight.controller.cluster.raft.behaviors.AbstractRaftActorBehavior;
import org.opendaylight.controller.cluster.raft.behaviors.Follower;
import org.opendaylight.controller.cluster.raft.behaviors.RaftActorBehavior;
-import org.opendaylight.controller.cluster.raft.client.messages.AddRaftPeer;
import org.opendaylight.controller.cluster.raft.client.messages.FindLeader;
import org.opendaylight.controller.cluster.raft.client.messages.FindLeaderReply;
-import org.opendaylight.controller.cluster.raft.client.messages.RemoveRaftPeer;
import org.opendaylight.controller.cluster.raft.messages.AppendEntriesReply;
import org.opendaylight.controller.cluster.raft.protobuff.client.messages.Payload;
import org.opendaylight.controller.protobuff.messages.cluster.raft.AppendEntriesMessages;
-import java.io.Serializable;
-import java.util.Map;
/**
* RaftActor encapsulates a state machine that needs to be kept synchronized
* <li> when a snapshot should be saved </li>
* </ul>
*/
-public abstract class RaftActor extends UntypedPersistentActor {
+public abstract class RaftActor extends AbstractUntypedPersistentActor {
protected final LoggingAdapter LOG =
Logging.getLogger(getContext().system(), this);
public void preStart() throws Exception {
LOG.info("Starting recovery for {} with journal batch size {}", persistenceId(),
context.getConfigParams().getJournalRecoveryLogBatchSize());
+
super.preStart();
}
@Override
- public void onReceiveRecover(Object message) {
- if (message instanceof SnapshotOffer) {
- onRecoveredSnapshot((SnapshotOffer)message);
- } else if (message instanceof ReplicatedLogEntry) {
- onRecoveredJournalLogEntry((ReplicatedLogEntry)message);
- } else if (message instanceof ApplyLogEntries) {
- onRecoveredApplyLogEntries((ApplyLogEntries)message);
- } else if (message instanceof DeleteEntries) {
- replicatedLog.removeFrom(((DeleteEntries) message).getFromIndex());
- } else if (message instanceof UpdateElectionTerm) {
- context.getTermInformation().update(((UpdateElectionTerm) message).getCurrentTerm(),
- ((UpdateElectionTerm) message).getVotedFor());
- } else if (message instanceof RecoveryCompleted) {
- onRecoveryCompletedMessage();
+ public void handleRecover(Object message) {
+ if(persistence().isRecoveryApplicable()) {
+ if (message instanceof SnapshotOffer) {
+ onRecoveredSnapshot((SnapshotOffer) message);
+ } else if (message instanceof ReplicatedLogEntry) {
+ onRecoveredJournalLogEntry((ReplicatedLogEntry) message);
+ } else if (message instanceof ApplyLogEntries) {
+ onRecoveredApplyLogEntries((ApplyLogEntries) message);
+ } else if (message instanceof DeleteEntries) {
+ replicatedLog.removeFrom(((DeleteEntries) message).getFromIndex());
+ } else if (message instanceof UpdateElectionTerm) {
+ context.getTermInformation().update(((UpdateElectionTerm) message).getCurrentTerm(),
+ ((UpdateElectionTerm) message).getVotedFor());
+ } else if (message instanceof RecoveryCompleted) {
+ onRecoveryCompletedMessage();
+ }
+ } else {
+ if (message instanceof RecoveryCompleted) {
+ // Delete all the messages from the akka journal so that we do not end up with consistency issues
+ // Note I am not using the dataPersistenceProvider and directly using the akka api here
+ deleteMessages(lastSequenceNr());
+
+ // Delete all the akka snapshots as they will not be needed
+ deleteSnapshots(new SnapshotSelectionCriteria(scala.Long.MaxValue(), scala.Long.MaxValue()));
+
+ onRecoveryComplete();
+
+ RaftActorBehavior oldBehavior = currentBehavior;
+ currentBehavior = new Follower(context);
+ handleBehaviorChange(oldBehavior, currentBehavior);
+ }
}
}
replicatedLog.lastIndex(), replicatedLog.snapshotIndex,
replicatedLog.snapshotTerm, replicatedLog.size());
+ RaftActorBehavior oldBehavior = currentBehavior;
currentBehavior = new Follower(context);
- onStateChanged();
+ handleBehaviorChange(oldBehavior, currentBehavior);
}
- @Override public void onReceiveCommand(Object message) {
+ @Override public void handleCommand(Object message) {
if (message instanceof ApplyState){
ApplyState applyState = (ApplyState) message;
if(LOG.isDebugEnabled()) {
LOG.debug("Persisting ApplyLogEntries with index={}", ale.getToIndex());
}
- persist(new ApplyLogEntries(ale.getToIndex()), new Procedure<ApplyLogEntries>() {
+ persist
ence().persist(new ApplyLogEntries(ale.getToIndex()), new Procedure<ApplyLogEntries>() {
@Override
public void apply(ApplyLogEntries param) throws Exception {
}
SaveSnapshotSuccess success = (SaveSnapshotSuccess) message;
LOG.info("SaveSnapshotSuccess received for snapshot");
- context.getReplicatedLog().snapshotCommit();
+ long sequenceNumber = success.metadata().sequenceNr();
- // TODO: Not sure if we want to be this aggressive with trimming stuff
- trimPersistentData(success.metadata().sequenceNr());
+ commitSnapshot(sequenceNumber);
} else if (message instanceof SaveSnapshotFailure) {
SaveSnapshotFailure saveSnapshotFailure = (SaveSnapshotFailure) message;
context.getReplicatedLog().getSnapshotTerm(),
context.getReplicatedLog().size());
- } else if (message instanceof AddRaftPeer){
-
- // FIXME : Do not add raft peers like this.
- // When adding a new Peer we have to ensure that the a majority of
- // the peers know about the new Peer. Doing it this way may cause
- // a situation where multiple Leaders may emerge
- AddRaftPeer arp = (AddRaftPeer)message;
- context.addToPeers(arp.getName(), arp.getAddress());
-
- } else if (message instanceof RemoveRaftPeer){
-
- RemoveRaftPeer rrp = (RemoveRaftPeer)message;
- context.removePeer(rrp.getName());
-
} else if (message instanceof CaptureSnapshot) {
LOG.info("CaptureSnapshot received by actor");
CaptureSnapshot cs = (CaptureSnapshot)message;
RaftActorBehavior oldBehavior = currentBehavior;
currentBehavior = currentBehavior.handleMessage(getSender(), message);
- if(oldBehavior != currentBehavior){
- onStateChanged();
- }
-
- onLeaderChanged(oldBehavior.getLeaderId(), currentBehavior.getLeaderId());
+ handleBehaviorChange(oldBehavior, currentBehavior);
}
}
- public java.util.Set<String> getPeers() {
- return context.getPeerAddresses().keySet();
- }
+ private void handleBehaviorChange(RaftActorBehavior oldBehavior, RaftActorBehavior currentBehavior) {
+ if (oldBehavior != currentBehavior){
+ onStateChanged();
+ }
+ if (oldBehavior != null) {
+ // it can happen that the state has not changed but the leader has changed.
+ onLeaderChanged(oldBehavior.getLeaderId(), currentBehavior.getLeaderId());
- protected String getReplicatedLogState() {
- return "snapshotIndex=" + context.getReplicatedLog().getSnapshotIndex()
- + ", snapshotTerm=" + context.getReplicatedLog().getSnapshotTerm()
- + ", im-mem journal size=" + context.getReplicatedLog().size();
+ if (getRoleChangeNotifier().isPresent() && oldBehavior.state() != currentBehavior.state()) {
+ // we do not want to notify when the behavior/role is set for the first time (i.e follower)
+ getRoleChangeNotifier().get().tell(new RoleChanged(getId(), oldBehavior.state().name(),
+ currentBehavior.state().name()), getSelf());
+ }
+ }
}
-
/**
* When a derived RaftActor needs to persist something it must call
* persistData.
context.setPeerAddress(peerId, peerAddress);
}
+ protected void commitSnapshot(long sequenceNumber) {
+ context.getReplicatedLog().snapshotCommit();
+ // TODO: Not sure if we want to be this aggressive with trimming stuff
+ trimPersistentData(sequenceNumber);
+ }
/**
* The applyState method will be called by the RaftActor when some data
/**
* This method is called during recovery to append state data to the current batch. This method
- * is called 1 or more times after {@link #startRecoveryStateBatch}.
+ * is called 1 or more times after {@link #startLogRecoveryBatch}.
*
* @param data the state data
*/
/**
* This method is called during recovery at the end of a batch to apply the current batched
- * log entries. This method is called after {@link #appendRecoveryLogEntry}.
+ * log entries. This method is called after {@link #appendRecoveredLogEntry}.
*/
protected abstract void applyCurrentLogRecoveryBatch();
*/
protected abstract void onStateChanged();
+ protected abstract DataPersistenceProvider persistence();
+
+ /**
+ * Notifier Actor for this RaftActor to notify when a role change happens
+ * @return ActorRef - ActorRef of the notifier or Optional.absent if none.
+ */
+ protected abstract Optional<ActorRef> getRoleChangeNotifier();
+
protected void onLeaderChanged(String oldLeader, String newLeader){};
private void trimPersistentData(long sequenceNumber) {
// Trim akka snapshots
// FIXME : Not sure how exactly the SnapshotSelectionCriteria is applied
// For now guessing that it is ANDed.
- deleteSnapshots(new SnapshotSelectionCriteria(
+ persistence().deleteSnapshots(new SnapshotSelectionCriteria(
sequenceNumber - context.getConfigParams().getSnapshotBatchCount(), 43200000));
// Trim akka journal
- deleteMessages(sequenceNumber);
+ persistence().deleteMessages(sequenceNumber);
}
private String getLeaderAddress(){
captureSnapshot.getLastIndex(), captureSnapshot.getLastTerm(),
captureSnapshot.getLastAppliedIndex(), captureSnapshot.getLastAppliedTerm());
- saveSnapshot(sn);
+ persistence().saveSnapshot(sn);
LOG.info("Persisting of snapshot done:{}", sn.getLogMessage());
//be greedy and remove entries from in-mem journal which are in the snapshot
// and update snapshotIndex and snapshotTerm without waiting for the success,
- context.getReplicatedLog().snapshotPreCommit(stateInBytes,
+ context.getReplicatedLog().snapshotPreCommit(
captureSnapshot.getLastAppliedIndex(),
captureSnapshot.getLastAppliedTerm());
"and term:{}", captureSnapshot.getLastAppliedIndex(),
captureSnapshot.getLastAppliedTerm());
+ if (isLeader() && captureSnapshot.isInstallSnapshotInitiated()) {
+ // this would be call straight to the leader and won't initiate in serialization
+ currentBehavior.handleMessage(getSelf(), new SendInstallSnapshot(stateInBytes));
+ }
+
captureSnapshot = null;
hasSnapshotCaptureInitiated = false;
}
-
private class ReplicatedLogImpl extends AbstractReplicatedLogImpl {
public ReplicatedLogImpl(Snapshot snapshot) {
- super(ByteString.copyFrom(snapshot.getState()),
- snapshot.getLastAppliedIndex(), snapshot.getLastAppliedTerm(),
+ super(snapshot.getLastAppliedIndex(), snapshot.getLastAppliedTerm(),
snapshot.getUnAppliedEntries());
}
// FIXME: Maybe this should be done after the command is saved
journal.subList(adjustedIndex , journal.size()).clear();
- persist(new DeleteEntries(adjustedIndex), new Procedure<DeleteEntries>(){
+ persistence().persist(new DeleteEntries(adjustedIndex), new Procedure<DeleteEntries>(){
@Override public void apply(DeleteEntries param)
throws Exception {
// persist call and the execution(s) of the associated event
// handler. This also holds for multiple persist calls in context
// of a single command.
- persist(replicatedLogEntry,
+ persistence().persist(replicatedLogEntry,
new Procedure<ReplicatedLogEntry>() {
@Override
public void apply(ReplicatedLogEntry evt) throws Exception {
}
- private static class DeleteEntries implements Serializable {
+ static class DeleteEntries implements Serializable {
+ private static final long serialVersionUID = 1L;
private final int fromIndex;
-
public DeleteEntries(int fromIndex) {
this.fromIndex = fromIndex;
}
public void updateAndPersist(long currentTerm, String votedFor){
update(currentTerm, votedFor);
// FIXME : Maybe first persist then update the state
- persist(new UpdateElectionTerm(this.currentTerm, this.votedFor), new Procedure<UpdateElectionTerm>(){
+ persistence().persist(new UpdateElectionTerm(this.currentTerm, this.votedFor), new Procedure<UpdateElectionTerm>(){
@Override public void apply(UpdateElectionTerm param)
throws Exception {
}
}
- private static class UpdateElectionTerm implements Serializable {
+ static class UpdateElectionTerm implements Serializable {
+ private static final long serialVersionUID = 1L;
private final long currentTerm;
private final String votedFor;
}
}
+ protected class NonPersistentRaftDataProvider extends NonPersistentDataProvider {
+
+ public NonPersistentRaftDataProvider(){
+
+ }
+
+ /**
+ * The way snapshotting works is,
+ * <ol>
+ * <li> RaftActor calls createSnapshot on the Shard
+ * <li> Shard sends a CaptureSnapshotReply and RaftActor then calls saveSnapshot
+ * <li> When saveSnapshot is invoked on the akka-persistence API it uses the SnapshotStore to save the snapshot.
+ * The SnapshotStore sends SaveSnapshotSuccess or SaveSnapshotFailure. When the RaftActor gets SaveSnapshot
+ * success it commits the snapshot to the in-memory journal. This commitSnapshot is mimicking what is done
+ * in SaveSnapshotSuccess.
+ * </ol>
+ * @param o
+ */
+ @Override
+ public void saveSnapshot(Object o) {
+ // Make saving Snapshot successful
+ commitSnapshot(-1L);
+ }
+ }
+
+ @VisibleForTesting
+ void setCurrentBehavior(AbstractRaftActorBehavior behavior) {
+ currentBehavior = behavior;
+ }
+
+ protected RaftActorBehavior getCurrentBehavior() {
+ return currentBehavior;
+ }
+
}
Code Review / controller.git / blobdiff