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;
022import org.apache.hadoop.hbase.ServerName;
023import org.apache.hadoop.hbase.client.RegionInfo;
024import org.apache.yetus.audience.InterfaceAudience;
025
026@InterfaceAudience.Private
027public interface FavoredNodesPromoter {
028
029  /* Try and assign regions even if favored nodes are dead */
030  String FAVORED_ALWAYS_ASSIGN_REGIONS = "hbase.favored.assignment.always.assign";
031
032  void generateFavoredNodesForDaughter(List<ServerName> servers, RegionInfo parent, RegionInfo hriA,
033    RegionInfo hriB) throws IOException;
034
035  void generateFavoredNodesForMergedRegion(RegionInfo merged, RegionInfo[] mergeParents)
036    throws IOException;
037}