1 /**
2 *
3 * Licensed to the Apache Software Foundation (ASF) under one
4 * or more contributor license agreements. See the NOTICE file
5 * distributed with this work for additional information
6 * regarding copyright ownership. The ASF licenses this file
7 * to you under the Apache License, Version 2.0 (the
8 * "License"); you may not use this file except in compliance
9 * with the License. You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 */
19 package org.apache.hadoop.hbase.regionserver;
20
21 import java.net.InetSocketAddress;
22 import java.util.List;
23
24 import org.apache.hadoop.classification.InterfaceAudience;
25 import org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.ServerName;
26
27 /**
28 * Abstraction that allows different modules in RegionServer to update/get
29 * the favored nodes information for regions.
30 */
31 @InterfaceAudience.Private
32 interface FavoredNodesForRegion {
33 /**
34 * Used to update the favored nodes mapping when required.
35 * @param encodedRegionName
36 * @param favoredNodes
37 */
38 void updateRegionFavoredNodesMapping(String encodedRegionName, List<ServerName> favoredNodes);
39
40 /**
41 * Get the favored nodes mapping for this region. Used when the HDFS create API
42 * is invoked to pass in favored nodes hints for new region files.
43 * @param encodedRegionName
44 * @return array containing the favored nodes' InetSocketAddresses
45 */
46 InetSocketAddress[] getFavoredNodesForRegion(String encodedRegionName);
47 }