hadoop NodeDescriptorsProvider 源码
haddop NodeDescriptorsProvider 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/nodelabels/NodeDescriptorsProvider.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.nodemanager.nodelabels;
import java.util.Set;
/**
* Interface which will be responsible for fetching node descriptors,
* a node descriptor could be a
* {@link org.apache.hadoop.yarn.api.records.NodeLabel} or a
* {@link org.apache.hadoop.yarn.api.records.NodeAttribute}.
*/
public interface NodeDescriptorsProvider<T> {
/**
* Provides the descriptors. The provider is expected to give same
* descriptors continuously until there is a change.
* If null is returned then an empty set is assumed by the caller.
*
* @return Set of node descriptors applicable for a node
*/
Set<T> getDescriptors();
/**
* Sets a set of descriptors to the provider.
* @param descriptors node descriptors.
*/
void setDescriptors(Set<T> descriptors);
}
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