mirror of
https://github.com/ceph/ceph-csi.git
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178 lines
7.4 KiB
Protocol Buffer
178 lines
7.4 KiB
Protocol Buffer
syntax = "proto2";
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package raftpb;
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import "gogoproto/gogo.proto";
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option (gogoproto.marshaler_all) = true;
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option (gogoproto.sizer_all) = true;
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option (gogoproto.unmarshaler_all) = true;
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option (gogoproto.goproto_getters_all) = false;
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option (gogoproto.goproto_enum_prefix_all) = false;
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enum EntryType {
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EntryNormal = 0;
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EntryConfChange = 1; // corresponds to pb.ConfChange
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EntryConfChangeV2 = 2; // corresponds to pb.ConfChangeV2
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}
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message Entry {
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optional uint64 Term = 2 [(gogoproto.nullable) = false]; // must be 64-bit aligned for atomic operations
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optional uint64 Index = 3 [(gogoproto.nullable) = false]; // must be 64-bit aligned for atomic operations
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optional EntryType Type = 1 [(gogoproto.nullable) = false];
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optional bytes Data = 4;
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}
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message SnapshotMetadata {
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optional ConfState conf_state = 1 [(gogoproto.nullable) = false];
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optional uint64 index = 2 [(gogoproto.nullable) = false];
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optional uint64 term = 3 [(gogoproto.nullable) = false];
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}
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message Snapshot {
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optional bytes data = 1;
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optional SnapshotMetadata metadata = 2 [(gogoproto.nullable) = false];
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}
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enum MessageType {
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MsgHup = 0;
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MsgBeat = 1;
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MsgProp = 2;
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MsgApp = 3;
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MsgAppResp = 4;
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MsgVote = 5;
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MsgVoteResp = 6;
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MsgSnap = 7;
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MsgHeartbeat = 8;
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MsgHeartbeatResp = 9;
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MsgUnreachable = 10;
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MsgSnapStatus = 11;
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MsgCheckQuorum = 12;
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MsgTransferLeader = 13;
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MsgTimeoutNow = 14;
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MsgReadIndex = 15;
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MsgReadIndexResp = 16;
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MsgPreVote = 17;
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MsgPreVoteResp = 18;
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}
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message Message {
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optional MessageType type = 1 [(gogoproto.nullable) = false];
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optional uint64 to = 2 [(gogoproto.nullable) = false];
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optional uint64 from = 3 [(gogoproto.nullable) = false];
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optional uint64 term = 4 [(gogoproto.nullable) = false];
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optional uint64 logTerm = 5 [(gogoproto.nullable) = false];
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optional uint64 index = 6 [(gogoproto.nullable) = false];
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repeated Entry entries = 7 [(gogoproto.nullable) = false];
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optional uint64 commit = 8 [(gogoproto.nullable) = false];
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optional Snapshot snapshot = 9 [(gogoproto.nullable) = false];
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optional bool reject = 10 [(gogoproto.nullable) = false];
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optional uint64 rejectHint = 11 [(gogoproto.nullable) = false];
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optional bytes context = 12;
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}
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message HardState {
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optional uint64 term = 1 [(gogoproto.nullable) = false];
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optional uint64 vote = 2 [(gogoproto.nullable) = false];
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optional uint64 commit = 3 [(gogoproto.nullable) = false];
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}
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// ConfChangeTransition specifies the behavior of a configuration change with
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// respect to joint consensus.
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enum ConfChangeTransition {
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// Automatically use the simple protocol if possible, otherwise fall back
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// to ConfChangeJointImplicit. Most applications will want to use this.
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ConfChangeTransitionAuto = 0;
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// Use joint consensus unconditionally, and transition out of them
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// automatically (by proposing a zero configuration change).
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//
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// This option is suitable for applications that want to minimize the time
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// spent in the joint configuration and do not store the joint configuration
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// in the state machine (outside of InitialState).
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ConfChangeTransitionJointImplicit = 1;
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// Use joint consensus and remain in the joint configuration until the
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// application proposes a no-op configuration change. This is suitable for
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// applications that want to explicitly control the transitions, for example
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// to use a custom payload (via the Context field).
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ConfChangeTransitionJointExplicit = 2;
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}
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message ConfState {
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// The voters in the incoming config. (If the configuration is not joint,
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// then the outgoing config is empty).
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repeated uint64 voters = 1;
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// The learners in the incoming config.
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repeated uint64 learners = 2;
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// The voters in the outgoing config.
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repeated uint64 voters_outgoing = 3;
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// The nodes that will become learners when the outgoing config is removed.
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// These nodes are necessarily currently in nodes_joint (or they would have
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// been added to the incoming config right away).
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repeated uint64 learners_next = 4;
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// If set, the config is joint and Raft will automatically transition into
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// the final config (i.e. remove the outgoing config) when this is safe.
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optional bool auto_leave = 5 [(gogoproto.nullable) = false];
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}
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enum ConfChangeType {
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ConfChangeAddNode = 0;
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ConfChangeRemoveNode = 1;
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ConfChangeUpdateNode = 2;
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ConfChangeAddLearnerNode = 3;
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}
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message ConfChange {
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optional ConfChangeType type = 2 [(gogoproto.nullable) = false];
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optional uint64 node_id = 3 [(gogoproto.nullable) = false, (gogoproto.customname) = "NodeID" ];
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optional bytes context = 4;
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// NB: this is used only by etcd to thread through a unique identifier.
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// Ideally it should really use the Context instead. No counterpart to
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// this field exists in ConfChangeV2.
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optional uint64 id = 1 [(gogoproto.nullable) = false, (gogoproto.customname) = "ID" ];
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}
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// ConfChangeSingle is an individual configuration change operation. Multiple
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// such operations can be carried out atomically via a ConfChangeV2.
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message ConfChangeSingle {
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optional ConfChangeType type = 1 [(gogoproto.nullable) = false];
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optional uint64 node_id = 2 [(gogoproto.nullable) = false, (gogoproto.customname) = "NodeID"];
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}
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// ConfChangeV2 messages initiate configuration changes. They support both the
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// simple "one at a time" membership change protocol and full Joint Consensus
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// allowing for arbitrary changes in membership.
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//
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// The supplied context is treated as an opaque payload and can be used to
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// attach an action on the state machine to the application of the config change
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// proposal. Note that contrary to Joint Consensus as outlined in the Raft
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// paper[1], configuration changes become active when they are *applied* to the
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// state machine (not when they are appended to the log).
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//
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// The simple protocol can be used whenever only a single change is made.
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//
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// Non-simple changes require the use of Joint Consensus, for which two
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// configuration changes are run. The first configuration change specifies the
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// desired changes and transitions the Raft group into the joint configuration,
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// in which quorum requires a majority of both the pre-changes and post-changes
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// configuration. Joint Consensus avoids entering fragile intermediate
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// configurations that could compromise survivability. For example, without the
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// use of Joint Consensus and running across three availability zones with a
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// replication factor of three, it is not possible to replace a voter without
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// entering an intermediate configuration that does not survive the outage of
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// one availability zone.
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//
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// The provided ConfChangeTransition specifies how (and whether) Joint Consensus
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// is used, and assigns the task of leaving the joint configuration either to
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// Raft or the application. Leaving the joint configuration is accomplished by
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// proposing a ConfChangeV2 with only and optionally the Context field
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// populated.
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//
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// For details on Raft membership changes, see:
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//
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// [1]: https://github.com/ongardie/dissertation/blob/master/online-trim.pdf
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message ConfChangeV2 {
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optional ConfChangeTransition transition = 1 [(gogoproto.nullable) = false];
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repeated ConfChangeSingle changes = 2 [(gogoproto.nullable) = false];
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optional bytes context = 3;
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}
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