Package org.opendaylight.controller.cluster.raft.behaviors

Class IsolatedLeader

java.lang.Object

org.opendaylight.controller.cluster.raft.behaviors.AbstractRaftActorBehavior

org.opendaylight.controller.cluster.raft.behaviors.AbstractLeader

org.opendaylight.controller.cluster.raft.behaviors.IsolatedLeader

All Implemented Interfaces:

AutoCloseable, RaftActorBehavior

public class IsolatedLeader
extends AbstractLeader

Leader which is termed as isolated.

If the reply from the majority of the followers is not received then the leader changes its behavior to IsolatedLeader. An isolated leader may have followers and they would continue to receive replicated messages.

A schedule is run, at an interval of (10 * Heartbeat-time-interval), in the Leader to check if its isolated or not.

In the Isolated Leader , on every AppendEntriesReply, we aggressively check if the leader is isolated. If no, then the state is switched back to Leader.

Field Summary

Fields inherited from class org.opendaylight.controller.cluster.raft.behaviors.AbstractRaftActorBehavior

context, log

Constructor Summary

Constructors

Constructor	Description
IsolatedLeader(RaftActorContext context)

Method Summary

Modifier and Type	Method	Description
protected RaftActorBehavior	handleAppendEntriesReply(ActorRef sender, AppendEntriesReply appendEntriesReply)	Derived classes should not directly handle AppendEntriesReply messages it should let the base class handle it first.

Methods inherited from class org.opendaylight.controller.cluster.raft.behaviors.AbstractLeader

addFollower, beforeSendHeartbeat, close, followerLogSize, getFollower, getFollowerIds, getLeaderId, getLeaderPayloadVersion, getMinIsolatedLeaderPeerCount, handleAppendEntries, handleMessage, handleRequestVoteReply, initiateCaptureSnapshot, isLeaderIsolated, printFollowerStates, removeFollower, sendAppendEntries, updateMinReplicaCount

Methods inherited from class org.opendaylight.controller.cluster.raft.behaviors.AbstractRaftActorBehavior

actor, appendEntries, applyLogToStateMachine, canGrantVote, canStartElection, createBehavior, currentTerm, electionDuration, getId, getLogEntryIndex, getLogEntryOrSnapshotTerm, getLogEntryTerm, getMajorityVoteCount, getReplicatedToAllIndex, internalSwitchBehavior, internalSwitchBehavior, lastIndex, lastTerm, logName, performSnapshotWithoutCapture, requestVote, scheduleElection, setReplicatedToAllIndex, shouldUpdateTerm, state, stopElection, switchBehavior, votedFor

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

IsolatedLeader

public IsolatedLeader(RaftActorContext context)

Method Details

handleAppendEntriesReply

protected RaftActorBehavior handleAppendEntriesReply(ActorRef sender,
 AppendEntriesReply appendEntriesReply)

Description copied from class: AbstractRaftActorBehavior

Derived classes should not directly handle AppendEntriesReply messages it should let the base class handle it first. Once the base class handles the AppendEntriesReply message and does the common actions that are applicable in all RaftState's it will delegate the handling of the AppendEntriesReply message to the derived class to do more state specific handling by calling this method

Overrides:

handleAppendEntriesReply in class AbstractLeader

Parameters:

sender - The actor that sent this message

appendEntriesReply - The AppendEntriesReply message

Returns:

a new behavior if it was changed or the current behavior