| /** |
| * 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.tez.runtime.common.resources; |
| |
| import org.apache.hadoop.classification.InterfaceAudience.Private; |
| import org.apache.hadoop.conf.Configurable; |
| |
| |
| |
| /** |
| * Used to balance memory requests before a task starts executing. |
| */ |
| @Private |
| public interface InitialMemoryAllocator extends Configurable { |
| |
| /** |
| * @param availableForAllocation |
| * memory available for allocation |
| * @param numTotalInputs |
| * number of inputs for the task |
| * @param numTotalOutputs |
| * number of outputs for the tasks |
| * @param requests |
| * Iterable view of requests received |
| * @return list of allocations, one per request. This must be ordered in the |
| * same order of the requests. |
| */ |
| public abstract Iterable<Long> assignMemory(long availableForAllocation, int numTotalInputs, |
| int numTotalOutputs, Iterable<InitialMemoryRequestContext> requests); |
| |
| } |