| /* |
| * 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 java.io.IOException; |
| import java.io.Serializable; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import org.apache.hadoop.mapred.JobConf; |
| import org.apache.pig.backend.executionengine.ExecException; |
| import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.ProgressableReporter; |
| import org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator; |
| import org.apache.pig.backend.hadoop.executionengine.physicalLayer.Result; |
| import org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc; |
| import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach; |
| import org.apache.pig.backend.hadoop.executionengine.spark.FlatMapFunctionAdapter; |
| import org.apache.pig.backend.hadoop.executionengine.spark.KryoSerializer; |
| import org.apache.pig.backend.hadoop.executionengine.spark.SparkShims; |
| import org.apache.pig.backend.hadoop.executionengine.spark.SparkUtil; |
| import org.apache.pig.data.SchemaTupleBackend; |
| import org.apache.pig.data.Tuple; |
| import org.apache.pig.impl.PigContext; |
| import org.apache.pig.impl.util.ObjectSerializer; |
| import org.apache.spark.rdd.RDD; |
| |
| /** |
| * Convert that is able to convert an RRD to another RRD using a POForEach |
| */ |
| @SuppressWarnings({"serial" }) |
| public class ForEachConverter implements RDDConverter<Tuple, Tuple, POForEach> { |
| |
| private JobConf jobConf; |
| |
| public ForEachConverter(JobConf jobConf) { |
| this.jobConf = jobConf; |
| } |
| |
| @Override |
| public RDD<Tuple> convert(List<RDD<Tuple>> predecessors, |
| POForEach physicalOperator) { |
| |
| byte[] confBytes = KryoSerializer.serializeJobConf(jobConf); |
| |
| SparkUtil.assertPredecessorSize(predecessors, physicalOperator, 1); |
| RDD<Tuple> rdd = predecessors.get(0); |
| ForEachFunction forEachFunction = new ForEachFunction(physicalOperator, confBytes); |
| |
| return rdd.toJavaRDD().mapPartitions(SparkShims.getInstance().flatMapFunction(forEachFunction), true).rdd(); |
| } |
| |
| private static class ForEachFunction implements |
| FlatMapFunctionAdapter<Iterator<Tuple>, Tuple>, Serializable { |
| |
| private POForEach poForEach; |
| private byte[] confBytes; |
| private transient JobConf jobConf; |
| |
| private ForEachFunction(POForEach poForEach, byte[] confBytes) { |
| this.poForEach = poForEach; |
| this.confBytes = confBytes; |
| } |
| |
| @Override |
| public Iterator<Tuple> call(final Iterator<Tuple> input) { |
| |
| initialize(); |
| |
| // Initialize a reporter as the UDF might want to report progress. |
| PhysicalOperator.setReporter(new ProgressableReporter()); |
| PhysicalOperator[] planLeafOps= poForEach.getPlanLeafOps(); |
| if (planLeafOps != null) { |
| for (PhysicalOperator op : planLeafOps) { |
| if (op.getClass() == POUserFunc.class) { |
| POUserFunc udf = (POUserFunc) op; |
| udf.setFuncInputSchema(); |
| } |
| } |
| } |
| return new OutputConsumerIterator(input) { |
| |
| @Override |
| protected void attach(Tuple tuple) { |
| poForEach.setInputs(null); |
| poForEach.attachInput(tuple); |
| } |
| |
| @Override |
| protected Result getNextResult() throws ExecException { |
| return poForEach.getNextTuple(); |
| } |
| |
| @Override |
| protected void endOfInput() { |
| } |
| }; |
| } |
| |
| private void initialize() { |
| if (this.jobConf == null) { |
| try { |
| this.jobConf = KryoSerializer.deserializeJobConf(this.confBytes); |
| PigContext pc = (PigContext) ObjectSerializer.deserialize(jobConf.get("pig.pigContext")); |
| SchemaTupleBackend.initialize(jobConf, pc); |
| } catch (IOException e) { |
| throw new RuntimeException("Couldn't initialize ForEachConverter"); |
| } |
| } |
| } |
| } |
| } |