org.apache.cassandra.service.paxos

Class ProposeCallback

java.lang.Object

org.apache.cassandra.service.paxos.AbstractPaxosCallback<java.lang.Boolean>

org.apache.cassandra.service.paxos.ProposeCallback

All Implemented Interfaces:

IAsyncCallback<java.lang.Boolean>

public class ProposeCallback
extends AbstractPaxosCallback<java.lang.Boolean>

ProposeCallback has two modes of operation, controlled by the failFast parameter. In failFast mode, we will return a failure as soon as a majority of nodes reject the proposal. This is used when replaying a proposal from an earlier leader. Otherwise, we wait for either all replicas to reply or until we achieve the desired quorum. We continue to wait for all replicas even after we know we cannot succeed because we need to know if no node at all have accepted or if at least one has. In the former case, a proposer is guaranteed no-one will replay its value; in the latter we don't, so we must timeout in case another leader replays it before we can; see CASSANDRA-6013

Field Summary

Fields inherited from class org.apache.cassandra.service.paxos.AbstractPaxosCallback

latch, targets

Fields inherited from interface org.apache.cassandra.net.IAsyncCallback

isAlive

Constructor Summary

Constructors

Constructor and Description
ProposeCallback(int totalTargets, int requiredTargets, boolean failFast, ConsistencyLevel consistency)

Method Summary

Modifier and Type	Method and Description
int	getAcceptCount()
boolean	isFullyRefused()
boolean	isSuccessful()
void	response(MessageIn<java.lang.Boolean> msg)

Methods inherited from class org.apache.cassandra.service.paxos.AbstractPaxosCallback

await, getResponseCount, isLatencyForSnitch

Methods inherited from class java.lang.Object

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

Constructor Detail

ProposeCallback

public ProposeCallback(int totalTargets,
                       int requiredTargets,
                       boolean failFast,
                       ConsistencyLevel consistency)

Method Detail

response

public void response(MessageIn<java.lang.Boolean> msg)

Parameters:

msg - response received.

getAcceptCount

public int getAcceptCount()

isSuccessful

public boolean isSuccessful()

isFullyRefused

public boolean isFullyRefused()