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.comm.aggregators; 20 21 import java.io.IOException; 22 23 import org.apache.hadoop.io.Writable; 24 25 /** 26 * Aggregates worker aggregator requests and sends them off 27 */ 28 public interface WorkerAggregatorRequestProcessor { 29 /** 30 * Sends worker reduced value to the owner of reducer 31 * 32 * @param name Name of the reducer 33 * @param reducedValue Reduced partial value 34 * @throws java.io.IOException 35 * @return True if reduced value will be sent, false if this worker is 36 * the owner of the reducer 37 */ 38 boolean sendReducedValue(String name, 39 Writable reducedValue) throws IOException; 40 41 /** 42 * Flush aggregated values cache. 43 * 44 * @throws IOException 45 */ 46 void flush() throws IOException; 47 48 /** 49 * Sends reduced values to the master. This worker is the owner of these 50 * reducers. 51 * 52 * @param data Serialized reduced values data 53 * @throws IOException 54 */ 55 void sendReducedValuesToMaster(byte[] data) throws IOException; 56 57 /** 58 * Sends reduced values to all other workers 59 * 60 * @param reducedDataList Serialized reduced values data split into chunks 61 */ 62 void distributeReducedValues( 63 Iterable<byte[]> reducedDataList) throws IOException; 64 }