| /* |
| * * |
| * 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.Map; |
| import java.util.Set; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.yarn.api.records.ApplicationId; |
| import org.apache.hadoop.yarn.api.resource.PlacementConstraint; |
| |
| /** |
| * Interface for storing and retrieving placement constraints (see |
| * {@link PlacementConstraint}). |
| */ |
| @InterfaceAudience.Private |
| @InterfaceStability.Unstable |
| public interface PlacementConstraintManager { |
| |
| /** |
| * Register all placement constraints of an application. |
| * |
| * @param appId the application ID |
| * @param constraintMap the map of allocation tags to constraints for this |
| * application |
| */ |
| void registerApplication(ApplicationId appId, |
| Map<Set<String>, PlacementConstraint> constraintMap); |
| |
| /** |
| * Add a placement constraint for a given application and a given set of |
| * (source) allocation tags. The constraint will be used on Scheduling |
| * Requests that carry this set of allocation tags. |
| * TODO: Support merge and not only replace when adding a constraint. |
| * |
| * @param appId the application ID |
| * @param sourceTags the set of allocation tags that will enable this |
| * constraint |
| * @param placementConstraint the constraint |
| * @param replace if true, an existing constraint for these tags will be |
| * replaced by the given one |
| */ |
| void addConstraint(ApplicationId appId, Set<String> sourceTags, |
| PlacementConstraint placementConstraint, boolean replace); |
| |
| /** |
| * Add a placement constraint that will be used globally. These constraints |
| * are added by the cluster administrator. |
| * TODO: Support merge and not only replace when adding a constraint. |
| * |
| * @param sourceTags the allocation tags that will enable this constraint |
| * @param placementConstraint the constraint |
| * @param replace if true, an existing constraint for these tags will be |
| * replaced by the given one |
| */ |
| void addGlobalConstraint(Set<String> sourceTags, |
| PlacementConstraint placementConstraint, boolean replace); |
| |
| /** |
| * Retrieve all constraints for a given application, along with the allocation |
| * tags that enable each constraint. |
| * |
| * @param appId the application ID |
| * @return the constraints for this application with the associated tags |
| */ |
| Map<Set<String>, PlacementConstraint> getConstraints(ApplicationId appId); |
| |
| /** |
| * Retrieve the placement constraint that is associated with a set of |
| * allocation tags for a given application. |
| * |
| * @param appId the application ID |
| * @param sourceTags the allocation tags that enable this constraint |
| * @return the constraint |
| */ |
| PlacementConstraint getConstraint(ApplicationId appId, |
| Set<String> sourceTags); |
| |
| /** |
| * Retrieve a global constraint that is associated with a given set of |
| * allocation tags. |
| * |
| * @param sourceTags the allocation tags that enable this constraint |
| * @return the constraint |
| */ |
| PlacementConstraint getGlobalConstraint(Set<String> sourceTags); |
| |
| /** |
| * Consider all levels of constraints (scheduling request, app, cluster) and |
| * return a merged constraint. |
| * |
| * @param applicationId application ID |
| * @param sourceTags a set of source allocation tags |
| * @param schedulingRequestConstraint placement constraint at scheduling |
| * request level |
| * @return a merged placement constraint |
| */ |
| PlacementConstraint getMultilevelConstraint(ApplicationId applicationId, |
| Set<String> sourceTags, PlacementConstraint schedulingRequestConstraint); |
| |
| /** |
| * Remove the constraints that correspond to a given application. |
| * |
| * @param appId the application that will be removed. |
| */ |
| void unregisterApplication(ApplicationId appId); |
| |
| /** |
| * Remove a global constraint that is associated with the given allocation |
| * tags. |
| * |
| * @param sourceTags the allocation tags |
| */ |
| void removeGlobalConstraint(Set<String> sourceTags); |
| |
| /** |
| * Returns the number of currently registered applications in the Placement |
| * Constraint Manager. |
| * |
| * @return number of registered applications. |
| */ |
| int getNumRegisteredApplications(); |
| |
| /** |
| * Returns the number of global constraints registered in the Placement |
| * Constraint Manager. |
| * |
| * @return number of global constraints. |
| */ |
| int getNumGlobalConstraints(); |
| |
| /** |
| * Validate a placement constraint and the set of allocation tags that will |
| * enable it. |
| * |
| * @param sourceTags the associated allocation tags |
| * @param placementConstraint the constraint |
| * @return true if constraint and tags are valid |
| */ |
| default boolean validateConstraint(Set<String> sourceTags, |
| PlacementConstraint placementConstraint) { |
| return true; |
| } |
| |
| } |