hadoop MultiNodeLookupPolicy 源码
haddop MultiNodeLookupPolicy 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/placement/MultiNodeLookupPolicy.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.yarn.server.resourcemanager.scheduler.placement;
import org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerNode;
import java.util.Collection;
import java.util.Iterator;
import java.util.Set;
/**
* <p>
* This class has the following functionality.
*
* <p>
* Provide an interface for MultiNodeLookupPolicy so that different placement
* allocator can choose nodes based on need.
* </p>
*/
public interface MultiNodeLookupPolicy<N extends SchedulerNode> {
/**
* Get iterator of preferred node depends on requirement and/or availability.
*
* @param nodes
* List of Nodes
* @param partition
* node label
*
* @return iterator of preferred node
*/
Iterator<N> getPreferredNodeIterator(Collection<N> nodes, String partition);
/**
* Refresh working nodes set for re-ordering based on the algorithm selected.
*
* @param nodes
* a collection working nm's.
*/
void addAndRefreshNodesSet(Collection<N> nodes, String partition);
/**
* Get sorted nodes per partition.
*
* @param partition
* node label
*
* @return collection of sorted nodes
*/
Set<N> getNodesPerPartition(String partition);
}
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