syntax = "proto3";
package replication_modepb;

enum ReplicationMode {
    // The standard mode. Replicate logs to majority peer.
    MAJORITY = 0;
    // DR mode. Replicate logs among 2 DCs.
    DR_AUTO_SYNC = 1;
}

// The replication status sync from PD to TiKV.
message ReplicationStatus {
    ReplicationMode mode = 1;
    DRAutoSync dr_auto_sync = 2;
}

enum DRAutoSyncState {
    // Raft logs need to sync between different DCs
    SYNC = 0;
    // Raft logs need to sync to majority peers
    ASYNC = 1;
    // Switching from ASYNC to SYNC mode
    SYNC_RECOVER = 2;
}

// The status of dr-autosync mode.
message DRAutoSync {
    // The key of the label that used for distinguish different DC.
    string label_key = 1;
    DRAutoSyncState state = 2;
    // Unique ID of the state, it increases after each state transfer.
    uint64 state_id = 3;
    // Duration to wait before switching to SYNC by force (in seconds)
    int32 wait_sync_timeout_hint = 4;
}

enum RegionReplicationState {
    // The region's state is unknown
    UNKNOWN = 0;
    // Logs sync to majority peers
    SIMPLE_MAJORITY = 1;
    // Logs sync to different DCs
    INTEGRITY_OVER_LABEL = 2;
}

// The replication status sync from TiKV to PD.
message RegionReplicationStatus {
    RegionReplicationState state = 1;
    // Unique ID of the state, it increases after each state transfer.
    uint64 state_id = 2;
}