001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.favored;
019
020import java.io.IOException;
021import java.util.List;
022
023import org.apache.yetus.audience.InterfaceAudience;
024import org.apache.hadoop.hbase.client.RegionInfo;
025import org.apache.hadoop.hbase.ServerName;
026
027@InterfaceAudience.Private
028public interface FavoredNodesPromoter {
029
030  /* Try and assign regions even if favored nodes are dead */
031  String FAVORED_ALWAYS_ASSIGN_REGIONS = "hbase.favored.assignment.always.assign";
032
033  void generateFavoredNodesForDaughter(List<ServerName> servers,
034      RegionInfo parent, RegionInfo hriA, RegionInfo hriB) throws IOException;
035
036  void generateFavoredNodesForMergedRegion(RegionInfo merged, RegionInfo [] mergeParents)
037      throws IOException;
038
039  List<ServerName> getFavoredNodes(RegionInfo regionInfo);
040}