org.apache.cassandra.service.paxos

Class PaxosPrepareRefresh

java.lang.Object

org.apache.cassandra.service.paxos.PaxosPrepareRefresh

All Implemented Interfaces:

RequestCallback<org.apache.cassandra.service.paxos.PaxosPrepareRefresh.Response>, RequestCallbackWithFailure<org.apache.cassandra.service.paxos.PaxosPrepareRefresh.Response>

public class PaxosPrepareRefresh
extends java.lang.Object
implements RequestCallbackWithFailure<org.apache.cassandra.service.paxos.PaxosPrepareRefresh.Response>

Nodes that have promised in response to our prepare, may be missing the latestCommit, meaning we cannot be sure the prior round has been committed to the necessary quorum of participants, so that it will be visible to future quorums. To resolve this problem, we submit the latest commit we have seen, and wait for confirmation before continuing (verifying that we are still promised in the process).

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	PaxosPrepareRefresh.RequestHandler
static class	PaxosPrepareRefresh.RequestSerializer
static class	PaxosPrepareRefresh.ResponseSerializer

Field Summary

Fields

Modifier and Type	Field and Description
static PaxosPrepareRefresh.RequestHandler	requestHandler
static PaxosPrepareRefresh.RequestSerializer	requestSerializer
static PaxosPrepareRefresh.ResponseSerializer	responseSerializer

Constructor Summary

Constructors

Constructor and Description
PaxosPrepareRefresh(Ballot prepared, org.apache.cassandra.service.paxos.Paxos.Participants participants, Commit.Committed latestCommitted, org.apache.cassandra.service.paxos.PaxosPrepareRefresh.Callbacks callbacks)

Method Summary

Modifier and Type	Method and Description
void	onFailure(InetAddressAndPort from, RequestFailureReason reason) Called when there is an exception on the remote node or timeout happens
void	onResponse(Message<org.apache.cassandra.service.paxos.PaxosPrepareRefresh.Response> message)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.cassandra.net.RequestCallbackWithFailure

invokeOnFailure

Methods inherited from interface org.apache.cassandra.net.RequestCallback

trackLatencyForSnitch

Field Detail

requestHandler

public static final PaxosPrepareRefresh.RequestHandler requestHandler

requestSerializer

public static final PaxosPrepareRefresh.RequestSerializer requestSerializer

responseSerializer

public static final PaxosPrepareRefresh.ResponseSerializer responseSerializer

Constructor Detail

PaxosPrepareRefresh

public PaxosPrepareRefresh(Ballot prepared,
                           org.apache.cassandra.service.paxos.Paxos.Participants participants,
                           Commit.Committed latestCommitted,
                           org.apache.cassandra.service.paxos.PaxosPrepareRefresh.Callbacks callbacks)

Method Detail

onFailure

public void onFailure(InetAddressAndPort from,
                      RequestFailureReason reason)

Description copied from interface: RequestCallbackWithFailure

Called when there is an exception on the remote node or timeout happens

Specified by:

onFailure in interface RequestCallback<org.apache.cassandra.service.paxos.PaxosPrepareRefresh.Response>

Specified by:

onFailure in interface RequestCallbackWithFailure<org.apache.cassandra.service.paxos.PaxosPrepareRefresh.Response>

onResponse

public void onResponse(Message<org.apache.cassandra.service.paxos.PaxosPrepareRefresh.Response> message)

Specified by:

onResponse in interface RequestCallback<org.apache.cassandra.service.paxos.PaxosPrepareRefresh.Response>

Parameters:

message - response received.