org.apache.zookeeper.server.quorum

Class Observer

java.lang.Object

org.apache.zookeeper.server.quorum.Learner

org.apache.zookeeper.server.quorum.Observer

public class Observer
extends Learner

Observers are peers that do not take part in the atomic broadcast protocol. Instead, they are informed of successful proposals by the Leader. Observers therefore naturally act as a relay point for publishing the proposal stream and can relieve Followers of some of the connection load. Observers may submit proposals, but do not vote in their acceptance. See ZOOKEEPER-368 for a discussion of this feature.

Field Summary

Fields inherited from class org.apache.zookeeper.server.quorum.Learner

bufferedOutput, leaderIs, leaderOs, leaderProtocolVersion, LOG, sock

Method Summary

Modifier and Type	Method and Description
protected void	processPacket(QuorumPacket qp) Controls the response of an observer to the receipt of a quorumpacket
void	shutdown() Shutdown the Observer.
String	toString()

Methods inherited from class org.apache.zookeeper.server.quorum.Learner

connectToLeader, findLeader, getPendingRevalidationsCount, getSocket, nanoTime, ping, registerWithLeader, revalidate, sockConnect, syncWithLeader

Methods inherited from class java.lang.Object

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

Method Detail

toString

public String toString()

Overrides:

toString in class Object

processPacket

protected void processPacket(QuorumPacket qp)
                      throws Exception

Controls the response of an observer to the receipt of a quorumpacket

Parameters:

qp -

Throws:

Exception

shutdown

public void shutdown()

Shutdown the Observer.

Overrides:

shutdown in class Learner