org.apache.ratis.statemachine

接口 StateMachine.FollowerEventApi

封闭接口:

StateMachine

public static interface StateMachine.FollowerEventApi

An optional API for follower-only event notifications. The method in this interface will be invoked only when the server is a follower.

字段概要

字段

限定符和类型	字段和说明
static StateMachine.FollowerEventApi	DEFAULT A noop implementation of StateMachine.FollowerEventApi.

方法概要

限定符和类型	方法和说明
default void	notifyExtendedNoLeader(org.apache.ratis.proto.RaftProtos.RoleInfoProto roleInfoProto) Notify the StateMachine that there is no leader in the group for an extended period of time.
default CompletableFuture<TermIndex>	notifyInstallSnapshotFromLeader(org.apache.ratis.proto.RaftProtos.RoleInfoProto roleInfoProto, TermIndex firstTermIndexInLog) Notify the StateMachine that the leader has purged entries from its log.

字段详细资料

DEFAULT

static final StateMachine.FollowerEventApi DEFAULT

A noop implementation of StateMachine.FollowerEventApi.

方法详细资料

notifyExtendedNoLeader

default void notifyExtendedNoLeader(org.apache.ratis.proto.RaftProtos.RoleInfoProto roleInfoProto)

Notify the StateMachine that there is no leader in the group for an extended period of time. This notification is based on "raft.server.notification.no-leader.timeout".

参数:

roleInfoProto - information about the current node role and rpc delay information

另请参阅:

RaftServerConfigKeys.Notification.NO_LEADER_TIMEOUT_KEY

notifyInstallSnapshotFromLeader

default CompletableFuture<TermIndex> notifyInstallSnapshotFromLeader(org.apache.ratis.proto.RaftProtos.RoleInfoProto roleInfoProto,
                                                                     TermIndex firstTermIndexInLog)

Notify the StateMachine that the leader has purged entries from its log. In order to catch up, the StateMachine has to install the latest snapshot asynchronously.

参数:

roleInfoProto - information about the current node role and rpc delay information.

firstTermIndexInLog - The term-index of the first append entry available in the leader's log.

返回:

return the last term-index in the snapshot after the snapshot installation.