DNSToSwitchMapping.java
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- /**
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements. See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership. The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- package org.apache.hadoop.net;
- import java.util.List;
- /**
- * An interface that should be implemented to allow pluggable
- * DNS-name/IP-address to RackID resolvers.
- *
- */
- public interface DNSToSwitchMapping {
- /**
- * Resolves a list of DNS-names/IP-addresses and returns back a list of
- * switch information (network paths). One-to-one correspondence must be
- * maintained between the elements in the lists.
- * Consider an element in the argument list - x.y.com. The switch information
- * that is returned must be a network path of the form /foo/rack,
- * where / is the root, and 'foo' is the switch where 'rack' is connected.
- * Note the hostname/ip-address is not part of the returned path.
- * The network topology of the cluster would determine the number of
- * components in the network path.
- * @param names
- * @return list of resolved network paths
- */
- public List<String> resolve(List<String> names);
- }