[120] | 1 | /** |
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| 2 | * Licensed to the Apache Software Foundation (ASF) under one |
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| 3 | * or more contributor license agreements. See the NOTICE file |
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| 4 | * distributed with this work for additional information |
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| 5 | * regarding copyright ownership. The ASF licenses this file |
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| 6 | * to you under the Apache License, Version 2.0 (the |
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| 7 | * "License"); you may not use this file except in compliance |
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| 8 | * with the License. You may obtain a copy of the License at |
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| 9 | * |
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| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 11 | * |
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| 12 | * Unless required by applicable law or agreed to in writing, software |
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| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 15 | * See the License for the specific language governing permissions and |
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| 16 | * limitations under the License. |
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| 17 | */ |
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| 18 | package org.apache.hadoop.net; |
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| 19 | |
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| 20 | import java.util.*; |
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| 21 | |
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| 22 | import org.apache.hadoop.conf.Configuration; |
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| 23 | import org.apache.hadoop.conf.Configured; |
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| 24 | |
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| 25 | /** |
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| 26 | * Implements the {@link DNSToSwitchMapping} via static mappings. Used |
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| 27 | * in testcases that simulate racks. |
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| 28 | * |
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| 29 | */ |
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| 30 | public class StaticMapping extends Configured implements DNSToSwitchMapping { |
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| 31 | public void setconf(Configuration conf) { |
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| 32 | String[] mappings = conf.getStrings("hadoop.configured.node.mapping"); |
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| 33 | if (mappings != null) { |
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| 34 | for (int i = 0; i < mappings.length; i++) { |
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| 35 | String str = mappings[i]; |
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| 36 | String host = str.substring(0, str.indexOf('=')); |
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| 37 | String rack = str.substring(str.indexOf('=') + 1); |
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| 38 | addNodeToRack(host, rack); |
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| 39 | } |
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| 40 | } |
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| 41 | } |
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| 42 | /* Only one instance per JVM */ |
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| 43 | private static Map<String, String> nameToRackMap = new HashMap<String, String>(); |
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| 44 | |
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| 45 | static synchronized public void addNodeToRack(String name, String rackId) { |
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| 46 | nameToRackMap.put(name, rackId); |
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| 47 | } |
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| 48 | public List<String> resolve(List<String> names) { |
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| 49 | List<String> m = new ArrayList<String>(); |
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| 50 | synchronized (nameToRackMap) { |
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| 51 | for (String name : names) { |
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| 52 | String rackId; |
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| 53 | if ((rackId = nameToRackMap.get(name)) != null) { |
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| 54 | m.add(rackId); |
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| 55 | } else { |
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| 56 | m.add(NetworkTopology.DEFAULT_RACK); |
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| 57 | } |
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| 58 | } |
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| 59 | return m; |
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| 60 | } |
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| 61 | } |
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| 62 | } |
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