* </ul>
*/
public class Follower extends AbstractRaftActorBehavior {
- private static final int SYNC_THRESHOLD = 10;
-
private static final long MAX_ELECTION_TIMEOUT_FACTOR = 18;
private final SyncStatusTracker initialSyncStatusTracker;
private String leaderId;
private short leaderPayloadVersion;
- public Follower(RaftActorContext context) {
+ public Follower(final RaftActorContext context) {
this(context, null, (short)-1);
}
- public Follower(RaftActorContext context, String initialLeaderId, short initialLeaderPayloadVersion) {
+ public Follower(final RaftActorContext context, final String initialLeaderId,
+ final short initialLeaderPayloadVersion) {
super(context, RaftState.Follower);
this.leaderId = initialLeaderId;
this.leaderPayloadVersion = initialLeaderPayloadVersion;
- initialSyncStatusTracker = new SyncStatusTracker(context.getActor(), getId(), SYNC_THRESHOLD);
+ initialSyncStatusTracker = new SyncStatusTracker(context.getActor(), getId(), context.getConfigParams()
+ .getSyncIndexThreshold());
if (context.getPeerIds().isEmpty() && getLeaderId() == null) {
actor().tell(TimeoutNow.INSTANCE, actor());
}
@VisibleForTesting
- protected final void setLeaderPayloadVersion(short leaderPayloadVersion) {
+ protected final void setLeaderPayloadVersion(final short leaderPayloadVersion) {
this.leaderPayloadVersion = leaderPayloadVersion;
}
lastLeaderMessageTimer.start();
}
- private boolean isLogEntryPresent(long index) {
+ private boolean isLogEntryPresent(final long index) {
if (context.getReplicatedLog().isInSnapshot(index)) {
return true;
}
}
- private void updateInitialSyncStatus(long currentLeaderCommit, String newLeaderId) {
+ private void updateInitialSyncStatus(final long currentLeaderCommit, final String newLeaderId) {
initialSyncStatusTracker.update(newLeaderId, currentLeaderCommit, context.getCommitIndex());
}
@Override
- protected RaftActorBehavior handleAppendEntries(ActorRef sender, AppendEntries appendEntries) {
+ protected RaftActorBehavior handleAppendEntries(final ActorRef sender, final AppendEntries appendEntries) {
int numLogEntries = appendEntries.getEntries() != null ? appendEntries.getEntries().size() : 0;
if (log.isTraceEnabled()) {
return this;
}
- private boolean isOutOfSync(AppendEntries appendEntries) {
+ private boolean isOutOfSync(final AppendEntries appendEntries) {
long prevLogTerm = getLogEntryTerm(appendEntries.getPrevLogIndex());
boolean prevEntryPresent = isLogEntryPresent(appendEntries.getPrevLogIndex());
}
@Override
- protected RaftActorBehavior handleAppendEntriesReply(ActorRef sender,
- AppendEntriesReply appendEntriesReply) {
+ protected RaftActorBehavior handleAppendEntriesReply(final ActorRef sender,
+ final AppendEntriesReply appendEntriesReply) {
return this;
}
@Override
- protected RaftActorBehavior handleRequestVoteReply(ActorRef sender,
- RequestVoteReply requestVoteReply) {
+ protected RaftActorBehavior handleRequestVoteReply(final ActorRef sender,
+ final RequestVoteReply requestVoteReply) {
return this;
}
@Override
- public RaftActorBehavior handleMessage(ActorRef sender, Object message) {
+ public RaftActorBehavior handleMessage(final ActorRef sender, final Object message) {
if (message instanceof ElectionTimeout || message instanceof TimeoutNow) {
return handleElectionTimeout(message);
}
return super.handleMessage(sender, rpc);
}
- private RaftActorBehavior handleElectionTimeout(Object message) {
+ private RaftActorBehavior handleElectionTimeout(final Object message) {
// If the message is ElectionTimeout, verify we haven't actually seen a message from the leader
// during the election timeout interval. It may that the election timer expired b/c this actor
// was busy and messages got delayed, in which case leader messages would be backed up in the
return false;
}
- private void handleInstallSnapshot(final ActorRef sender, InstallSnapshot installSnapshot) {
+ private void handleInstallSnapshot(final ActorRef sender, final InstallSnapshot installSnapshot) {
log.debug("{}: handleInstallSnapshot: {}", logName(), installSnapshot);