hadoop OrderedResolver 源码
haddop OrderedResolver 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/resolver/order/OrderedResolver.java
/**
* 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.hdfs.server.federation.resolver.order;
import org.apache.hadoop.hdfs.server.federation.resolver.PathLocation;
/**
* Policy that decides which should be the first location accessed given
* multiple destinations.
*/
public interface OrderedResolver {
/**
* Get the first namespace based on this resolver approach.
*
* @param path Path to check.
* @param loc Federated location with multiple destinations.
* @return First namespace out of the locations.
*/
String getFirstNamespace(String path, PathLocation loc);
}
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