| /* |
| * * |
| * 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.constraint; |
| |
| import java.util.Set; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.service.AbstractService; |
| import org.apache.hadoop.yarn.api.resource.PlacementConstraint; |
| |
| /** |
| * The service that implements the {@link PlacementConstraintManager} interface. |
| */ |
| @InterfaceAudience.Private |
| @InterfaceStability.Unstable |
| public abstract class PlacementConstraintManagerService extends AbstractService |
| implements PlacementConstraintManager { |
| |
| protected static final Logger LOG = |
| LoggerFactory.getLogger(PlacementConstraintManagerService.class); |
| |
| private PlacementConstraintManager placementConstraintManager = null; |
| |
| public PlacementConstraintManagerService() { |
| super(PlacementConstraintManagerService.class.getName()); |
| } |
| |
| @Override |
| public boolean validateConstraint(Set<String> sourceTags, |
| PlacementConstraint placementConstraint) { |
| if (!validateSourceTags(sourceTags)) { |
| return false; |
| } |
| // TODO: Perform actual validation of the constraint (in YARN-6621). |
| // TODO: Perform satisfiability check for constraint. |
| return true; |
| } |
| |
| /** |
| * Validates whether the allocation tags that will enable a constraint have |
| * the expected format. At the moment we support a single allocation tag per |
| * constraint. |
| * |
| * @param sourceTags the source allocation tags |
| * @return true if the tags have the expected format |
| */ |
| protected boolean validateSourceTags(Set<String> sourceTags) { |
| if (sourceTags.isEmpty()) { |
| LOG.warn("A placement constraint cannot be associated with an empty " |
| + "set of tags."); |
| return false; |
| } |
| if (sourceTags.size() > 1) { |
| LOG.warn("Only a single tag can be associated with a placement " |
| + "constraint currently."); |
| return false; |
| } |
| return true; |
| } |
| |
| /** |
| * This method will return a single allocation tag. It should be called after |
| * validating the tags by calling {@link #validateSourceTags}. |
| * |
| * @param sourceTags the source allocation tags |
| * @return the single source tag |
| */ |
| protected String getValidSourceTag(Set<String> sourceTags) { |
| return sourceTags.iterator().next(); |
| } |
| |
| } |