Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
WorkerGraphPartitioner |
|
| 1.0;1 |
1 | /* | |
2 | * Licensed to the Apache Software Foundation (ASF) under one | |
3 | * or more contributor license agreements. See the NOTICE file | |
4 | * distributed with this work for additional information | |
5 | * regarding copyright ownership. The ASF licenses this file | |
6 | * to you under the Apache License, Version 2.0 (the | |
7 | * "License"); you may not use this file except in compliance | |
8 | * with the License. You may obtain a copy of the License at | |
9 | * | |
10 | * http://www.apache.org/licenses/LICENSE-2.0 | |
11 | * | |
12 | * Unless required by applicable law or agreed to in writing, software | |
13 | * distributed under the License is distributed on an "AS IS" BASIS, | |
14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
15 | * See the License for the specific language governing permissions and | |
16 | * limitations under the License. | |
17 | */ | |
18 | ||
19 | package org.apache.giraph.partition; | |
20 | ||
21 | import org.apache.giraph.worker.WorkerInfo; | |
22 | import org.apache.hadoop.io.Writable; | |
23 | import org.apache.hadoop.io.WritableComparable; | |
24 | ||
25 | import java.util.Collection; | |
26 | ||
27 | /** | |
28 | * Stores the {@link PartitionOwner} objects from the master and provides the | |
29 | * mapping of vertex to {@link PartitionOwner}. Also generates the partition | |
30 | * owner implementation. | |
31 | * | |
32 | * @param <I> Vertex id | |
33 | * @param <V> Vertex value | |
34 | * @param <E> Edge value | |
35 | */ | |
36 | @SuppressWarnings("rawtypes") | |
37 | public interface WorkerGraphPartitioner<I extends WritableComparable, | |
38 | V extends Writable, E extends Writable> { | |
39 | /** | |
40 | * Instantiate the {@link PartitionOwner} implementation used to read the | |
41 | * master assignments. | |
42 | * | |
43 | * @return Instantiated {@link PartitionOwner} object | |
44 | */ | |
45 | PartitionOwner createPartitionOwner(); | |
46 | ||
47 | /** | |
48 | * Figure out the owner of a vertex | |
49 | * | |
50 | * @param vertexId Vertex id to get the partition for | |
51 | * @return Correct partition owner | |
52 | */ | |
53 | PartitionOwner getPartitionOwner(I vertexId); | |
54 | ||
55 | /** | |
56 | * At the end of a superstep, workers have {@link PartitionStats} generated | |
57 | * for each of their partitions. This method will allow the user to | |
58 | * modify or create their own {@link PartitionStats} interfaces to send to | |
59 | * the master. | |
60 | * | |
61 | * @param workerPartitionStats Stats generated by the infrastructure during | |
62 | * the superstep | |
63 | * @param partitionStore Partition store for this worker | |
64 | * (could be used to provide more useful stat information) | |
65 | * @return Final partition stats | |
66 | */ | |
67 | Collection<PartitionStats> finalizePartitionStats( | |
68 | Collection<PartitionStats> workerPartitionStats, | |
69 | PartitionStore<I, V, E> partitionStore); | |
70 | ||
71 | /** | |
72 | * Get the partitions owners and update locally. Returns the partitions | |
73 | * to send to other workers and other dependencies. | |
74 | * | |
75 | * @param myWorkerInfo Worker info. | |
76 | * @param masterSetPartitionOwners Master set partition owners, received | |
77 | * prior to beginning the superstep | |
78 | * @return Information for the partition exchange. | |
79 | */ | |
80 | PartitionExchange updatePartitionOwners( | |
81 | WorkerInfo myWorkerInfo, | |
82 | Collection<? extends PartitionOwner> masterSetPartitionOwners); | |
83 | ||
84 | /** | |
85 | * Get a collection of the {@link PartitionOwner} objects. | |
86 | * | |
87 | * @return Collection of owners for every partition. | |
88 | */ | |
89 | Collection<? extends PartitionOwner> getPartitionOwners(); | |
90 | } |