| /** |
| * 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.reservation; |
| |
| import org.apache.hadoop.classification.InterfaceAudience.LimitedPrivate; |
| import org.apache.hadoop.classification.InterfaceStability.Unstable; |
| import org.apache.hadoop.yarn.api.records.ReservationId; |
| import org.apache.hadoop.yarn.server.resourcemanager.reservation.exceptions.PlanningException; |
| |
| /** |
| * This is the interface for policy that validate new |
| * {@link ReservationAllocation}s for allocations being added to a {@link Plan}. |
| * Individual policies will be enforcing different invariants. |
| */ |
| @LimitedPrivate("yarn") |
| @Unstable |
| public interface SharingPolicy { |
| |
| /** |
| * Initialize this policy. |
| * |
| * @param planQueuePath the name of the queue for this plan |
| * @param conf the system configuration |
| */ |
| void init(String planQueuePath, ReservationSchedulerConfiguration conf); |
| |
| /** |
| * This method runs the policy validation logic, and return true/false on |
| * whether the {@link ReservationAllocation} is acceptable according to this |
| * sharing policy. |
| * |
| * @param plan the {@link Plan} we validate against |
| * @param newAllocation the allocation proposed to be added to the |
| * {@link Plan} |
| * @throws PlanningException if the policy is respected if we add this |
| * {@link ReservationAllocation} to the {@link Plan} |
| */ |
| void validate(Plan plan, ReservationAllocation newAllocation) |
| throws PlanningException; |
| |
| /** |
| * This method provide a (partial) instantaneous validation by applying |
| * business rules (such as max number of parallel containers allowed for a |
| * user). To provide the agent with more feedback the returned parameter is |
| * expressed in number of containers that can be fit in this time according to |
| * the business rules. |
| * |
| * @param available the amount of resources that would be offered if not |
| * constrained by the policy |
| * @param plan reference the the current Plan |
| * @param user the username |
| * @param start the start time for the range we are querying |
| * @param end the end time for the range we are querying |
| * @param oldId (optional) the id of a reservation being updated |
| * |
| * @return the available resources expressed as a |
| * {@link RLESparseResourceAllocation} |
| * |
| * @throws PlanningException throws if the request is not valid |
| */ |
| RLESparseResourceAllocation availableResources( |
| RLESparseResourceAllocation available, Plan plan, String user, |
| ReservationId oldId, long start, long end) throws PlanningException; |
| |
| /** |
| * Returns the time range before and after the current reservation considered |
| * by this policy. In particular, this informs the archival process for the |
| * {@link Plan}, i.e., reservations regarding times before (now - validWindow) |
| * can be deleted. |
| * |
| * @return validWindow the window of validity considered by the policy. |
| */ |
| long getValidWindow(); |
| |
| } |