/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

// This file contains protocol buffers that are used for Admin service.

option java_package = "org.apache.hadoop.hbase.protobuf.generated";
option java_outer_classname = "AdminProtos";
option java_generic_services = true;
option java_generate_equals_and_hash = true;
option optimize_for = SPEED;

import "Client.proto";
import "HBase.proto";
import "WAL.proto";

message GetRegionInfoRequest {
  required RegionSpecifier region = 1;
  optional bool compaction_state = 2;
}

message GetRegionInfoResponse {
  required RegionInfo region_info = 1;
  optional CompactionState compaction_state = 2;
  optional bool isRecovering = 3;

  enum CompactionState {
    NONE = 0;
    MINOR = 1;
    MAJOR = 2;
    MAJOR_AND_MINOR = 3;
  }
}

/**
 * Get a list of store files for a set of column families in a particular region.
 * If no column family is specified, get the store files for all column families.
 */
message GetStoreFileRequest {
  required RegionSpecifier region = 1;
  repeated bytes family = 2;
}

message GetStoreFileResponse {
  repeated string store_file = 1;
}

message GetOnlineRegionRequest {
}

message GetOnlineRegionResponse {
  repeated RegionInfo region_info = 1;
}

message OpenRegionRequest {
  repeated RegionOpenInfo open_info = 1;
  // the intended server for this RPC.
  optional uint64 serverStartCode = 2;

  message RegionOpenInfo {
    required RegionInfo region = 1;
    optional uint32 version_of_offline_node = 2;
    repeated ServerName favored_nodes = 3;
  }
}

message OpenRegionResponse {
  repeated RegionOpeningState opening_state = 1;

  enum RegionOpeningState {
    OPENED = 0;
    ALREADY_OPENED = 1;
    FAILED_OPENING = 2;
  }
}

/**
 * Closes the specified region and will use or not use ZK during the close
 * according to the specified flag.
 */
message CloseRegionRequest {
  required RegionSpecifier region = 1;
  optional uint32 version_of_closing_node = 2;
  optional bool transition_in_ZK = 3 [default = true];
  optional ServerName destination_server = 4;
  // the intended server for this RPC.
  optional uint64 serverStartCode = 5;
}

message CloseRegionResponse {
  required bool closed = 1;
}

/**
 * Flushes the MemStore of the specified region.
 * <p>
 * This method is synchronous.
 */
message FlushRegionRequest {
  required RegionSpecifier region = 1;
  optional uint64 if_older_than_ts = 2;
}

message FlushRegionResponse {
  required uint64 last_flush_time = 1;
  optional bool flushed = 2;
}

/**
 * Splits the specified region.
 * <p>
 * This method currently flushes the region and then forces a compaction which
 * will then trigger a split.  The flush is done synchronously but the
 * compaction is asynchronous.
 */
message SplitRegionRequest {
  required RegionSpecifier region = 1;
  optional bytes split_point = 2;
}

message SplitRegionResponse {
}

/**
 * Compacts the specified region.  Performs a major compaction if specified.
 * <p>
 * This method is asynchronous.
 */
message CompactRegionRequest {
  required RegionSpecifier region = 1;
  optional bool major = 2;
  optional bytes family = 3;
}

message CompactRegionResponse {
}

message UpdateFavoredNodesRequest {
  repeated RegionUpdateInfo update_info = 1;

  message RegionUpdateInfo {
    required RegionInfo region = 1;
    repeated ServerName favored_nodes = 2;
  }
}

message UpdateFavoredNodesResponse {
  optional uint32 response = 1;
}

/**
 * Merges the specified regions.
 * <p>
 * This method currently closes the regions and then merges them
 */
message MergeRegionsRequest {
  required RegionSpecifier region_a = 1;
  required RegionSpecifier region_b = 2;
  optional bool forcible = 3 [default = false];
}

message MergeRegionsResponse {
}

// Protocol buffer version of WAL for replication
message WALEntry {
  required WALKey key = 1;
  // Following may be null if the KVs/Cells are carried along the side in a cellblock (See
  // RPC for more on cellblocks). If Cells/KVs are in a cellblock, this next field is null
  // and associated_cell_count has count of Cells associated w/ this WALEntry
  repeated bytes key_value_bytes = 2;
  // If Cell data is carried alongside in a cellblock, this is count of Cells in the cellblock.
  optional int32 associated_cell_count = 3;
}

/**
 * Replicates the given entries. The guarantee is that the given entries
 * will be durable on the slave cluster if this method returns without
 * any exception.  hbase.replication has to be set to true for this to work.
 */
message ReplicateWALEntryRequest {
  repeated WALEntry entry = 1;
}

message ReplicateWALEntryResponse {
}

message RollWALWriterRequest {
}

message RollWALWriterResponse {
  // A list of encoded name of regions to flush
  repeated bytes region_to_flush = 1;
}

message StopServerRequest {
  required string reason = 1;
}

message StopServerResponse {
}

message GetServerInfoRequest {
}

message ServerInfo {
  required ServerName server_name = 1;
  optional uint32 webui_port = 2;
}

message GetServerInfoResponse {
  required ServerInfo server_info = 1;
}

service AdminService {
  rpc GetRegionInfo(GetRegionInfoRequest)
    returns(GetRegionInfoResponse);

  rpc GetStoreFile(GetStoreFileRequest)
    returns(GetStoreFileResponse);

  rpc GetOnlineRegion(GetOnlineRegionRequest)
    returns(GetOnlineRegionResponse);

  rpc OpenRegion(OpenRegionRequest)
    returns(OpenRegionResponse);

  rpc CloseRegion(CloseRegionRequest)
    returns(CloseRegionResponse);

  rpc FlushRegion(FlushRegionRequest)
    returns(FlushRegionResponse);

  rpc SplitRegion(SplitRegionRequest)
    returns(SplitRegionResponse);

  rpc CompactRegion(CompactRegionRequest)
    returns(CompactRegionResponse);

  rpc MergeRegions(MergeRegionsRequest)
    returns(MergeRegionsResponse);

  rpc ReplicateWALEntry(ReplicateWALEntryRequest)
    returns(ReplicateWALEntryResponse);

  rpc Replay(ReplicateWALEntryRequest)
    returns(ReplicateWALEntryResponse);

  rpc RollWALWriter(RollWALWriterRequest)
    returns(RollWALWriterResponse);

  rpc GetServerInfo(GetServerInfoRequest)
    returns(GetServerInfoResponse);

  rpc StopServer(StopServerRequest)
    returns(StopServerResponse);

  rpc UpdateFavoredNodes(UpdateFavoredNodesRequest)
    returns(UpdateFavoredNodesResponse);
}
