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.List; |
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21 | |
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22 | /** |
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23 | * An interface that should be implemented to allow pluggable |
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24 | * DNS-name/IP-address to RackID resolvers. |
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25 | * |
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26 | */ |
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27 | public interface DNSToSwitchMapping { |
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28 | /** |
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29 | * Resolves a list of DNS-names/IP-addresses and returns back a list of |
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30 | * switch information (network paths). One-to-one correspondence must be |
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31 | * maintained between the elements in the lists. |
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32 | * Consider an element in the argument list - x.y.com. The switch information |
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33 | * that is returned must be a network path of the form /foo/rack, |
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34 | * where / is the root, and 'foo' is the switch where 'rack' is connected. |
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35 | * Note the hostname/ip-address is not part of the returned path. |
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36 | * The network topology of the cluster would determine the number of |
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37 | * components in the network path. |
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38 | * @param names |
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39 | * @return list of resolved network paths |
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40 | */ |
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41 | public List<String> resolve(List<String> names); |
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42 | } |
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