content: /*
   * 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 com.aliyun.odps.graph.partitioner;
  
  import com.aliyun.odps.graph.Partitioner;
  import com.aliyun.odps.io.WritableComparable;
  
  /**
   * 系统默认的分区类,
   * 通过顶点ID的哈希值对worker数取余的方法，确定顶点分配到哪个worker
   *
   * @param <VERTEX_ID>
   *     Vertex ID 类型
   */
  public class HashPartitioner<VERTEX_ID extends WritableComparable<?>> extends
                                                                        Partitioner<VERTEX_ID> {
  
    @Override
    public int getPartition(VERTEX_ID vertexId, int numPartitions) {
      return Math.abs(vertexId.hashCode() % numPartitions);
    }
  
  }
  