hadoop DestinationOrder 源码
haddop DestinationOrder 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/resolver/order/DestinationOrder.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 java.util.EnumSet;
/**
* Order of the destinations when we have multiple of them. When the resolver
* of files to subclusters (FileSubclusterResolver) has multiple destinations,
* this determines which location should be checked first.
*/
public enum DestinationOrder {
HASH, // Follow consistent hashing in the first folder level
LOCAL, // Local first
RANDOM, // Random order
HASH_ALL, // Follow consistent hashing
SPACE; // Available space based order
/** Approaches that write folders in all subclusters. */
public static final EnumSet<DestinationOrder> FOLDER_ALL = EnumSet.of(
HASH_ALL,
RANDOM,
SPACE);
}
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