() {
+ @Override
+ public void apply(ApplyLogEntries param) throws Exception {
+ }
+ });
+
} else if(message instanceof ApplySnapshot ) {
- applySnapshot(((ApplySnapshot) message).getSnapshot());
+ Snapshot snapshot = ((ApplySnapshot) message).getSnapshot();
+
+ if(LOG.isDebugEnabled()) {
+ LOG.debug("ApplySnapshot called on Follower Actor " +
+ "snapshotIndex:{}, snapshotTerm:{}", snapshot.getLastAppliedIndex(),
+ snapshot.getLastAppliedTerm()
+ );
+ }
+ applySnapshot(ByteString.copyFrom(snapshot.getState()));
+
+ //clears the followers log, sets the snapshot index to ensure adjusted-index works
+ replicatedLog = new ReplicatedLogImpl(snapshot);
+ context.setReplicatedLog(replicatedLog);
+ context.setLastApplied(snapshot.getLastAppliedIndex());
+
} else if (message instanceof FindLeader) {
getSender().tell(
- new FindLeaderReply(
- context.getPeerAddress(currentBehavior.getLeaderId())),
+ new FindLeaderReply(getLeaderAddress()),
getSelf()
);
+
} else if (message instanceof SaveSnapshotSuccess) {
SaveSnapshotSuccess success = (SaveSnapshotSuccess) message;
+ LOG.info("SaveSnapshotSuccess received for snapshot");
+
+ 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;
- // TODO: Handle failure in saving the snapshot
- // Maybe do retries on failure
+ LOG.info("saveSnapshotFailure.metadata():{}", saveSnapshotFailure.metadata().toString());
+ LOG.error(saveSnapshotFailure.cause(), "SaveSnapshotFailure received for snapshot Cause:");
- } else if (message instanceof AddRaftPeer){
+ context.getReplicatedLog().snapshotRollback();
- // 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());
+ LOG.info("Replicated Log rollbacked. Snapshot will be attempted in the next cycle." +
+ "snapshotIndex:{}, snapshotTerm:{}, log-size:{}",
+ context.getReplicatedLog().getSnapshotIndex(),
+ context.getReplicatedLog().getSnapshotTerm(),
+ context.getReplicatedLog().size());
- } else if (message instanceof RemoveRaftPeer){
+ } else if (message instanceof CaptureSnapshot) {
+ LOG.info("CaptureSnapshot received by actor");
+ CaptureSnapshot cs = (CaptureSnapshot)message;
+ captureSnapshot = cs;
+ createSnapshot();
- RemoveRaftPeer rrp = (RemoveRaftPeer)message;
- context.removePeer(rrp.getName());
+ } else if (message instanceof CaptureSnapshotReply){
+ LOG.info("CaptureSnapshotReply received by actor");
+ CaptureSnapshotReply csr = (CaptureSnapshotReply) message;
+
+ ByteString stateInBytes = csr.getSnapshot();
+ LOG.info("CaptureSnapshotReply stateInBytes size:{}", stateInBytes.size());
+ handleCaptureSnapshotReply(stateInBytes);
} else {
+ if (!(message instanceof AppendEntriesMessages.AppendEntries)
+ && !(message instanceof AppendEntriesReply) && !(message instanceof SendHeartBeat)) {
+ if(LOG.isDebugEnabled()) {
+ LOG.debug("onReceiveCommand: message: {}", message.getClass());
+ }
+ }
+
+ RaftActorBehavior oldBehavior = currentBehavior;
+ currentBehavior = currentBehavior.handleMessage(getSender(), message);
- RaftState state =
- currentBehavior.handleMessage(getSender(), message);
- currentBehavior = switchBehavior(state);
+ handleBehaviorChange(oldBehavior, currentBehavior);
}
}
+ 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());
+ 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
@@ -193,13 +398,15 @@ public abstract class RaftActor extends UntypedPersistentActor {
* @param data
*/
protected void persistData(ActorRef clientActor, String identifier,
- Object data) {
+ Payload data) {
ReplicatedLogEntry replicatedLogEntry = new ReplicatedLogImplEntry(
context.getReplicatedLog().lastIndex() + 1,
context.getTermInformation().getCurrentTerm(), data);
- LOG.debug("Persist data {}", replicatedLogEntry);
+ if(LOG.isDebugEnabled()) {
+ LOG.debug("Persist data {}", replicatedLogEntry);
+ }
replicatedLog
.appendAndPersist(clientActor, identifier, replicatedLogEntry);
@@ -227,21 +434,71 @@ public abstract class RaftActor extends UntypedPersistentActor {
* @return A reference to the leader if known, null otherwise
*/
protected ActorSelection getLeader(){
- String leaderId = currentBehavior.getLeaderId();
- if (leaderId == null) {
+ String leaderAddress = getLeaderAddress();
+
+ if(leaderAddress == null){
return null;
}
- String peerAddress = context.getPeerAddress(leaderId);
- LOG.debug("getLeader leaderId = " + leaderId + " peerAddress = "
- + peerAddress);
- return context.actorSelection(peerAddress);
+
+ return context.actorSelection(leaderAddress);
+ }
+
+ /**
+ *
+ * @return the current leader's id
+ */
+ protected String getLeaderId(){
+ return currentBehavior.getLeaderId();
}
protected RaftState getRaftState() {
return currentBehavior.state();
}
+ protected ReplicatedLogEntry getLastLogEntry() {
+ return replicatedLog.last();
+ }
+
+ protected Long getCurrentTerm(){
+ return context.getTermInformation().getCurrentTerm();
+ }
+
+ protected Long getCommitIndex(){
+ return context.getCommitIndex();
+ }
+ protected Long getLastApplied(){
+ return context.getLastApplied();
+ }
+
+ protected RaftActorContext getRaftActorContext() {
+ return context;
+ }
+
+ /**
+ * setPeerAddress sets the address of a known peer at a later time.
+ *
+ * This is to account for situations where a we know that a peer
+ * exists but we do not know an address up-front. This may also be used in
+ * situations where a known peer starts off in a different location and we
+ * need to change it's address
+ *
+ * Note that if the peerId does not match the list of peers passed to
+ * this actor during construction an IllegalStateException will be thrown.
+ *
+ * @param peerId
+ * @param peerAddress
+ */
+ protected void setPeerAddress(String peerId, String peerAddress){
+ 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
@@ -263,6 +520,38 @@ public abstract class RaftActor extends UntypedPersistentActor {
protected abstract void applyState(ActorRef clientActor, String identifier,
Object data);
+ /**
+ * This method is called during recovery at the start of a batch of state entries. Derived
+ * classes should perform any initialization needed to start a batch.
+ */
+ protected abstract void startLogRecoveryBatch(int maxBatchSize);
+
+ /**
+ * This method is called during recovery to append state data to the current batch. This method
+ * is called 1 or more times after {@link #startLogRecoveryBatch}.
+ *
+ * @param data the state data
+ */
+ protected abstract void appendRecoveredLogEntry(Payload data);
+
+ /**
+ * This method is called during recovery to reconstruct the state of the actor.
+ *
+ * @param snapshot A snapshot of the state of the actor
+ */
+ protected abstract void applyRecoverySnapshot(ByteString snapshot);
+
+ /**
+ * 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 #appendRecoveredLogEntry}.
+ */
+ protected abstract void applyCurrentLogRecoveryBatch();
+
+ /**
+ * This method is called when recovery is complete.
+ */
+ protected abstract void onRecoveryComplete();
+
/**
* This method will be called by the RaftActor when a snapshot needs to be
* created. The derived actor should respond with its current state.
@@ -272,165 +561,127 @@ public abstract class RaftActor extends UntypedPersistentActor {
*
* @return The current state of the actor
*/
- protected abstract Object createSnapshot();
+ protected abstract void createSnapshot();
/**
- * This method will be called by the RaftActor during recovery to
- * reconstruct the state of the actor.
- *
- * This method may also be called at any other point during normal
+ * This method can be called at any other point during normal
* operations when the derived actor is out of sync with it's peers
* and the only way to bring it in sync is by applying a snapshot
*
* @param snapshot A snapshot of the state of the actor
*/
- protected abstract void applySnapshot(Object snapshot);
+ protected abstract void applySnapshot(ByteString snapshot);
- private RaftActorBehavior switchBehavior(RaftState state) {
- if (currentBehavior != null) {
- if (currentBehavior.state() == state) {
- return currentBehavior;
- }
- LOG.info("Switching from state " + currentBehavior.state() + " to "
- + state);
-
- try {
- currentBehavior.close();
- } catch (Exception e) {
- LOG.error(e,
- "Failed to close behavior : " + currentBehavior.state());
- }
+ /**
+ * This method will be called by the RaftActor when the state of the
+ * RaftActor changes. The derived actor can then use methods like
+ * isLeader or getLeader to do something useful
+ */
+ protected abstract void onStateChanged();
- } else {
- LOG.info("Switching behavior to " + state);
- }
- RaftActorBehavior behavior = null;
- if (state == RaftState.Candidate) {
- behavior = new Candidate(context);
- } else if (state == RaftState.Follower) {
- behavior = new Follower(context);
- } else {
- behavior = new Leader(context);
- }
- return behavior;
- }
+ 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 getRoleChangeNotifier();
+
+ protected void onLeaderChanged(String oldLeader, String newLeader){};
private void trimPersistentData(long sequenceNumber) {
- // Trim snapshots
+ // Trim akka snapshots
// FIXME : Not sure how exactly the SnapshotSelectionCriteria is applied
// For now guessing that it is ANDed.
- deleteSnapshots(new SnapshotSelectionCriteria(
- sequenceNumber - 100000, 43200000));
+ persistence().deleteSnapshots(new SnapshotSelectionCriteria(
+ sequenceNumber - context.getConfigParams().getSnapshotBatchCount(), 43200000));
- // Trim journal
- deleteMessages(sequenceNumber);
+ // Trim akka journal
+ persistence().deleteMessages(sequenceNumber);
}
-
- private class ReplicatedLogImpl implements ReplicatedLog {
- private final List journal;
- private final Object snapshot;
- private long snapshotIndex = -1;
- private long snapshotTerm = -1;
-
- public ReplicatedLogImpl(Snapshot snapshot) {
- this.snapshot = snapshot.getState();
- this.snapshotIndex = snapshot.getLastAppliedIndex();
- this.snapshotTerm = snapshot.getLastAppliedTerm();
-
- this.journal = new ArrayList<>(snapshot.getUnAppliedEntries());
+ private String getLeaderAddress(){
+ if(isLeader()){
+ return getSelf().path().toString();
}
-
- public ReplicatedLogImpl() {
- this.snapshot = null;
- this.journal = new ArrayList<>();
+ String leaderId = currentBehavior.getLeaderId();
+ if (leaderId == null) {
+ return null;
+ }
+ String peerAddress = context.getPeerAddress(leaderId);
+ if(LOG.isDebugEnabled()) {
+ LOG.debug("getLeaderAddress leaderId = {} peerAddress = {}",
+ leaderId, peerAddress);
}
- @Override public ReplicatedLogEntry get(long index) {
- int adjustedIndex = adjustedIndex(index);
+ return peerAddress;
+ }
- if (adjustedIndex < 0 || adjustedIndex >= journal.size()) {
- return null;
- }
+ private void handleCaptureSnapshotReply(ByteString stateInBytes) {
+ // create a snapshot object from the state provided and save it
+ // when snapshot is saved async, SaveSnapshotSuccess is raised.
- return journal.get(adjustedIndex);
- }
+ Snapshot sn = Snapshot.create(stateInBytes.toByteArray(),
+ context.getReplicatedLog().getFrom(captureSnapshot.getLastAppliedIndex() + 1),
+ captureSnapshot.getLastIndex(), captureSnapshot.getLastTerm(),
+ captureSnapshot.getLastAppliedIndex(), captureSnapshot.getLastAppliedTerm());
- @Override public ReplicatedLogEntry last() {
- if (journal.size() == 0) {
- return null;
- }
- return get(journal.size() - 1);
- }
+ persistence().saveSnapshot(sn);
- @Override public long lastIndex() {
- if (journal.size() == 0) {
- return -1;
- }
+ LOG.info("Persisting of snapshot done:{}", sn.getLogMessage());
- return last().getIndex();
- }
+ //be greedy and remove entries from in-mem journal which are in the snapshot
+ // and update snapshotIndex and snapshotTerm without waiting for the success,
- @Override public long lastTerm() {
- if (journal.size() == 0) {
- return -1;
- }
+ context.getReplicatedLog().snapshotPreCommit(
+ captureSnapshot.getLastAppliedIndex(),
+ captureSnapshot.getLastAppliedTerm());
- return last().getTerm();
- }
+ LOG.info("Removed in-memory snapshotted entries, adjusted snaphsotIndex:{} " +
+ "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));
+ }
- @Override public void removeFrom(long index) {
- int adjustedIndex = adjustedIndex(index);
+ captureSnapshot = null;
+ hasSnapshotCaptureInitiated = false;
+ }
- if (adjustedIndex < 0 || adjustedIndex >= journal.size()) {
- return;
- }
+ private class ReplicatedLogImpl extends AbstractReplicatedLogImpl {
- journal.subList(adjustedIndex , journal.size()).clear();
+ public ReplicatedLogImpl(Snapshot snapshot) {
+ super(snapshot.getLastAppliedIndex(), snapshot.getLastAppliedTerm(),
+ snapshot.getUnAppliedEntries());
}
+ public ReplicatedLogImpl() {
+ super();
+ }
- @Override public void removeFromAndPersist(long index) {
- int adjustedIndex = adjustedIndex(index);
+ @Override public void removeFromAndPersist(long logEntryIndex) {
+ int adjustedIndex = adjustedIndex(logEntryIndex);
- if (adjustedIndex < 0 || adjustedIndex >= journal.size()) {
+ if (adjustedIndex < 0) {
return;
}
// FIXME: Maybe this should be done after the command is saved
journal.subList(adjustedIndex , journal.size()).clear();
- persist(new DeleteEntries(adjustedIndex), new Procedure(){
+ persistence().persist(new DeleteEntries(adjustedIndex), new Procedure(){
@Override public void apply(DeleteEntries param)
throws Exception {
//FIXME : Doing nothing for now
+ dataSize = 0;
+ for(ReplicatedLogEntry entry : journal){
+ dataSize += entry.size();
+ }
}
});
-
-
- }
-
- @Override public void append(
- final ReplicatedLogEntry replicatedLogEntry) {
- journal.add(replicatedLogEntry);
- }
-
- @Override public List getFrom(long index) {
- int adjustedIndex = adjustedIndex(index);
-
- List entries = new ArrayList<>(100);
- if (adjustedIndex < 0 || adjustedIndex >= journal.size()) {
- return entries;
- }
-
-
- for (int i = adjustedIndex;
- i < journal.size(); i++) {
- entries.add(journal.get(i));
- }
- return entries;
}
@Override public void appendAndPersist(
@@ -438,11 +689,19 @@ public abstract class RaftActor extends UntypedPersistentActor {
appendAndPersist(null, null, replicatedLogEntry);
}
+ @Override
+ public int dataSize() {
+ return dataSize;
+ }
+
public void appendAndPersist(final ActorRef clientActor,
final String identifier,
final ReplicatedLogEntry replicatedLogEntry) {
- context.getLogger().debug(
- "Append log entry and persist " + replicatedLogEntry);
+
+ if(LOG.isDebugEnabled()) {
+ LOG.debug("Append log entry and persist {} ", replicatedLogEntry);
+ }
+
// FIXME : By adding the replicated log entry to the in-memory journal we are not truly ensuring durability of the logs
journal.add(replicatedLogEntry);
@@ -451,24 +710,43 @@ public abstract class RaftActor extends UntypedPersistentActor {
// 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() {
+ @Override
public void apply(ReplicatedLogEntry evt) throws Exception {
- // FIXME : Tentatively create a snapshot every hundred thousand entries. To be tuned.
- if (size() > 100000) {
- ReplicatedLogEntry lastAppliedEntry =
- get(context.getLastApplied());
+ dataSize += replicatedLogEntry.size();
+
+ long dataThreshold = Runtime.getRuntime().totalMemory() *
+ getRaftActorContext().getConfigParams().getSnapshotDataThresholdPercentage() / 100;
+
+ // when a snaphsot is being taken, captureSnapshot != null
+ if (hasSnapshotCaptureInitiated == false &&
+ ( journal.size() % context.getConfigParams().getSnapshotBatchCount() == 0 ||
+ dataSize > dataThreshold)) {
+
+ LOG.info("Initiating Snapshot Capture..");
long lastAppliedIndex = -1;
long lastAppliedTerm = -1;
+
+ ReplicatedLogEntry lastAppliedEntry = get(context.getLastApplied());
if (lastAppliedEntry != null) {
lastAppliedIndex = lastAppliedEntry.getIndex();
lastAppliedTerm = lastAppliedEntry.getTerm();
}
- saveSnapshot(Snapshot.create(createSnapshot(),
- getFrom(context.getLastApplied() + 1),
- lastIndex(), lastTerm(), lastAppliedIndex,
- lastAppliedTerm));
+ if(LOG.isDebugEnabled()) {
+ LOG.debug("Snapshot Capture logSize: {}", journal.size());
+ LOG.debug("Snapshot Capture lastApplied:{} ",
+ context.getLastApplied());
+ LOG.debug("Snapshot Capture lastAppliedIndex:{}", lastAppliedIndex);
+ LOG.debug("Snapshot Capture lastAppliedTerm:{}", lastAppliedTerm);
+ }
+
+ // send a CaptureSnapshot to self to make the expensive operation async.
+ getSelf().tell(new CaptureSnapshot(
+ lastIndex(), lastTerm(), lastAppliedIndex, lastAppliedTerm),
+ null);
+ hasSnapshotCaptureInitiated = true;
}
// Send message for replication
if (clientActor != null) {
@@ -482,82 +760,12 @@ public abstract class RaftActor extends UntypedPersistentActor {
);
}
- @Override public long size() {
- return journal.size() + snapshotIndex + 1;
- }
-
- @Override public boolean isPresent(long index) {
- int adjustedIndex = adjustedIndex(index);
-
- if (adjustedIndex < 0 || adjustedIndex >= journal.size()) {
- return false;
- }
- return true;
- }
-
- @Override public boolean isInSnapshot(long index) {
- return index <= snapshotIndex;
- }
-
- @Override public Object getSnapshot() {
- return snapshot;
- }
-
- @Override public long getSnapshotIndex() {
- return snapshotIndex;
- }
-
- @Override public long getSnapshotTerm() {
- return snapshotTerm;
- }
-
- private int adjustedIndex(long index) {
- if(snapshotIndex < 0){
- return (int) index;
- }
- return (int) (index - snapshotIndex);
- }
}
-
- private static class ReplicatedLogImplEntry implements ReplicatedLogEntry,
- Serializable {
-
- private final long index;
- private final long term;
- private final Object payload;
-
- public ReplicatedLogImplEntry(long index, long term, Object payload) {
-
- this.index = index;
- this.term = term;
- this.payload = payload;
- }
-
- @Override public Object getData() {
- return payload;
- }
-
- @Override public long getTerm() {
- return term;
- }
-
- @Override public long getIndex() {
- return index;
- }
-
- @Override public String toString() {
- return "Entry{" +
- "index=" + index +
- ", term=" + term +
- '}';
- }
- }
-
- 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;
}
@@ -568,54 +776,6 @@ public abstract class RaftActor extends UntypedPersistentActor {
}
- private static class Snapshot implements Serializable {
- private final Object state;
- private final List unAppliedEntries;
- private final long lastIndex;
- private final long lastTerm;
- private final long lastAppliedIndex;
- private final long lastAppliedTerm;
-
- private Snapshot(Object state,
- List unAppliedEntries, long lastIndex,
- long lastTerm, long lastAppliedIndex, long lastAppliedTerm) {
- this.state = state;
- this.unAppliedEntries = unAppliedEntries;
- this.lastIndex = lastIndex;
- this.lastTerm = lastTerm;
- this.lastAppliedIndex = lastAppliedIndex;
- this.lastAppliedTerm = lastAppliedTerm;
- }
-
-
- public static Snapshot create(Object state,
- List entries, long lastIndex, long lastTerm,
- long lastAppliedIndex, long lastAppliedTerm) {
- return new Snapshot(state, entries, lastIndex, lastTerm,
- lastAppliedIndex, lastAppliedTerm);
- }
-
- public Object getState() {
- return state;
- }
-
- public List getUnAppliedEntries() {
- return unAppliedEntries;
- }
-
- public long getLastTerm() {
- return lastTerm;
- }
-
- public long getLastAppliedIndex() {
- return lastAppliedIndex;
- }
-
- public long getLastAppliedTerm() {
- return lastAppliedTerm;
- }
- }
-
private class ElectionTermImpl implements ElectionTerm {
/**
* Identifier of the actor whose election term information this is
@@ -623,17 +783,20 @@ public abstract class RaftActor extends UntypedPersistentActor {
private long currentTerm = 0;
private String votedFor = null;
+ @Override
public long getCurrentTerm() {
return currentTerm;
}
+ @Override
public String getVotedFor() {
return votedFor;
}
@Override public void update(long currentTerm, String votedFor) {
- LOG.info("Set currentTerm={}, votedFor={}", currentTerm, votedFor);
-
+ if(LOG.isDebugEnabled()) {
+ LOG.debug("Set currentTerm={}, votedFor={}", currentTerm, votedFor);
+ }
this.currentTerm = currentTerm;
this.votedFor = votedFor;
}
@@ -642,7 +805,7 @@ public abstract class RaftActor extends UntypedPersistentActor {
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(){
+ persistence().persist(new UpdateElectionTerm(this.currentTerm, this.votedFor), new Procedure(){
@Override public void apply(UpdateElectionTerm param)
throws Exception {
@@ -652,7 +815,8 @@ public abstract class RaftActor extends UntypedPersistentActor {
}
}
- 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;
@@ -670,4 +834,38 @@ public abstract class RaftActor extends UntypedPersistentActor {
}
}
+ protected class NonPersistentRaftDataProvider extends NonPersistentDataProvider {
+
+ public NonPersistentRaftDataProvider(){
+
+ }
+
+ /**
+ * The way snapshotting works is,
+ *
+ * - RaftActor calls createSnapshot on the Shard
+ *
- Shard sends a CaptureSnapshotReply and RaftActor then calls saveSnapshot
+ *
- 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.
+ *
+ * @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;
+ }
+
}