| /* |
| * 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.Collection; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Set; |
| |
| import org.apache.giraph.worker.WorkerInfo; |
| import org.apache.hadoop.io.Writable; |
| import org.apache.hadoop.io.WritableComparable; |
| |
| import com.google.common.collect.Lists; |
| import org.apache.log4j.Logger; |
| |
| /** |
| * Abstracts and implements all WorkerGraphPartitioner logic on top of a single |
| * user function - getPartitionIndex. |
| * |
| * @param <I> Vertex id type |
| * @param <V> Vertex value type |
| * @param <E> Edge value type |
| */ |
| public abstract class WorkerGraphPartitionerImpl<I extends WritableComparable, |
| V extends Writable, E extends Writable> |
| implements WorkerGraphPartitioner<I, V, E> { |
| /** Logger instance */ |
| private static final Logger LOG = Logger.getLogger( |
| WorkerGraphPartitionerImpl.class); |
| /** List of {@link PartitionOwner}s for this worker. */ |
| private List<PartitionOwner> partitionOwnerList = Lists.newArrayList(); |
| /** List of available workers */ |
| private Set<WorkerInfo> availableWorkers = new HashSet<>(); |
| |
| @Override |
| public PartitionOwner createPartitionOwner() { |
| return new BasicPartitionOwner(); |
| } |
| |
| @Override |
| public PartitionOwner getPartitionOwner(I vertexId) { |
| return partitionOwnerList.get( |
| getPartitionIndex(vertexId, partitionOwnerList.size(), |
| availableWorkers.size())); |
| } |
| |
| @Override |
| public Collection<PartitionStats> finalizePartitionStats( |
| Collection<PartitionStats> workerPartitionStats, |
| PartitionStore<I, V, E> partitionStore) { |
| // No modification necessary |
| return workerPartitionStats; |
| } |
| |
| @Override |
| public PartitionExchange updatePartitionOwners(WorkerInfo myWorkerInfo, |
| Collection<? extends PartitionOwner> masterSetPartitionOwners) { |
| PartitionExchange exchange = PartitionBalancer.updatePartitionOwners( |
| partitionOwnerList, myWorkerInfo, masterSetPartitionOwners); |
| extractAvailableWorkers(); |
| return exchange; |
| } |
| |
| @Override |
| public Collection<? extends PartitionOwner> getPartitionOwners() { |
| return partitionOwnerList; |
| } |
| |
| /** |
| * Update availableWorkers |
| */ |
| public void extractAvailableWorkers() { |
| availableWorkers.clear(); |
| for (PartitionOwner partitionOwner : partitionOwnerList) { |
| availableWorkers.add(partitionOwner.getWorkerInfo()); |
| } |
| LOG.info("After updating partitionOwnerList " + availableWorkers.size() + |
| " workers are available"); |
| } |
| |
| /** |
| * Calculates in which partition current vertex belongs to, |
| * from interval [0, partitionCount). |
| * |
| * @param id Vertex id |
| * @param partitionCount Number of partitions |
| * @param workerCount Number of active workers |
| * @return partition |
| */ |
| protected abstract int getPartitionIndex(I id, int partitionCount, |
| int workerCount); |
| } |