/**
* 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;
import org.apache.hadoop.service.AbstractService;
import org.apache.hadoop.yarn.api.records.NodeLabel;
/**
* Interface which will be responsible for fetching the labels
*
*/
public abstract class NodeLabelsProvider extends AbstractService {
public NodeLabelsProvider(String name) {
super(name);
}
/**
* Provides the labels. LabelProvider is expected to give same Labels
* continuously until there is a change in labels.
* If null is returned then Empty label set is assumed by the caller.
*
* @return Set of node label strings applicable for a node
*/
public abstract Set<NodeLabel> getNodeLabels();
}