| /* |
| * 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.pig.backend.hadoop.executionengine.spark.converter; |
| |
| import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POBroadcastSpark; |
| import org.apache.pig.backend.hadoop.executionengine.spark.SparkPigContext; |
| import org.apache.pig.backend.hadoop.executionengine.spark.SparkUtil; |
| import org.apache.pig.data.Tuple; |
| import org.apache.spark.api.java.JavaRDD; |
| import org.apache.spark.api.java.JavaSparkContext; |
| import org.apache.spark.broadcast.Broadcast; |
| import org.apache.spark.rdd.RDD; |
| |
| import java.util.List; |
| |
| public class BroadcastConverter implements RDDConverter<Tuple, Tuple, POBroadcastSpark> { |
| |
| private final JavaSparkContext sc; |
| |
| public BroadcastConverter(JavaSparkContext sc) { |
| this.sc = sc; |
| } |
| |
| @Override |
| public RDD<Tuple> convert(List<RDD<Tuple>> predecessors, POBroadcastSpark po) { |
| SparkUtil.assertPredecessorSize(predecessors, po, 1); |
| RDD<Tuple> rdd = predecessors.get(0); |
| |
| // Just collect the predecessor RDD, and broadcast it |
| JavaRDD<Tuple> javaRDD = new JavaRDD<>(rdd, SparkUtil.getManifest(Tuple.class)); |
| Broadcast<List<Tuple>> broadcastedRDD = sc.broadcast(javaRDD.collect()); |
| |
| // Save the broadcast variable to broadcastedVars map, so that this |
| // broadcasted variable can be referenced by the driver client. |
| SparkPigContext.get().getBroadcastedVars().put(po.getBroadcastedVariableName(), broadcastedRDD); |
| |
| return rdd; |
| } |
| |
| } |