| /** |
| * 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.mapred; |
| |
| import java.util.Map; |
| /** |
| * This interface is intended for allowing schedulers to |
| * communicate with the queue share management implementation. |
| * Schedulers can periodically poll this interface to |
| * obtain the latest queue allocations. |
| */ |
| public interface QueueAllocator { |
| /** |
| * Used by schedulers to obtain queue allocations periodically |
| * @return hashtable of queue names and their allocations (shares) |
| */ |
| Map<String,QueueAllocation> getAllocation(); |
| /** |
| * Used by schedulers to push queue usage info for |
| * accounting purposes. |
| * @param queue the queue name |
| * @param used of slots currently used |
| * @param pending number of tasks pending |
| */ |
| void setUsage(String queue, int used, int pending); |
| } |