| /* |
| * 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.giraph.partition; |
| |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.List; |
| |
| import org.apache.giraph.conf.ImmutableClassesGiraphConfiguration; |
| import org.apache.giraph.worker.WorkerInfo; |
| import org.apache.hadoop.io.Writable; |
| import org.apache.hadoop.io.WritableComparable; |
| |
| import com.google.common.collect.Lists; |
| |
| /** |
| * Abstracts and implements all MasterGraphPartitioner logic on top of a single |
| * user function - getWorkerIndex. |
| * |
| * @param <I> Vertex id type |
| * @param <V> Vertex value type |
| * @param <E> Edge value type |
| */ |
| public abstract class MasterGraphPartitionerImpl<I extends WritableComparable, |
| V extends Writable, E extends Writable> |
| implements MasterGraphPartitioner<I, V, E> { |
| /** Provided configuration */ |
| private final ImmutableClassesGiraphConfiguration<I, V, E> conf; |
| /** Save the last generated partition owner list */ |
| private List<PartitionOwner> partitionOwnerList; |
| |
| /** |
| * Constructor. |
| * |
| * @param conf |
| * Configuration used. |
| */ |
| public MasterGraphPartitionerImpl( |
| ImmutableClassesGiraphConfiguration<I, V, E> conf) { |
| this.conf = conf; |
| } |
| |
| @Override |
| public Collection<PartitionOwner> createInitialPartitionOwners( |
| Collection<WorkerInfo> availableWorkerInfos, int maxWorkers) { |
| int partitionCount = PartitionUtils.computePartitionCount( |
| availableWorkerInfos.size(), conf); |
| ArrayList<WorkerInfo> workerList = |
| new ArrayList<WorkerInfo>(availableWorkerInfos); |
| |
| partitionOwnerList = new ArrayList<PartitionOwner>(); |
| for (int i = 0; i < partitionCount; i++) { |
| partitionOwnerList.add(new BasicPartitionOwner(i, workerList.get( |
| getWorkerIndex(i, partitionCount, workerList.size())))); |
| } |
| |
| return partitionOwnerList; |
| } |
| |
| @Override |
| public void setPartitionOwners(Collection<PartitionOwner> partitionOwners) { |
| partitionOwnerList = Lists.newArrayList(partitionOwners); |
| } |
| |
| @Override |
| public Collection<PartitionOwner> generateChangedPartitionOwners( |
| Collection<PartitionStats> allPartitionStatsList, |
| Collection<WorkerInfo> availableWorkers, |
| int maxWorkers, |
| long superstep) { |
| return PartitionBalancer.balancePartitionsAcrossWorkers(conf, |
| partitionOwnerList, allPartitionStatsList, availableWorkers); |
| } |
| |
| @Override |
| public Collection<PartitionOwner> getCurrentPartitionOwners() { |
| return partitionOwnerList; |
| } |
| |
| @Override |
| public PartitionStats createPartitionStats() { |
| return new PartitionStats(); |
| } |
| |
| /** |
| * Calculates worker that should be responsible for passed partition. |
| * |
| * @param partition Current partition |
| * @param partitionCount Number of partitions |
| * @param workerCount Number of workers |
| * @return index of worker responsible for current partition |
| */ |
| protected abstract int getWorkerIndex( |
| int partition, int partitionCount, int workerCount); |
| } |