/*
* Copyright © 2016 Cask Data, Inc.
*
* Licensed 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 co.cask.cdap.spark;
import co.cask.cdap.api.dataset.lib.TimePartitionedFileSetArguments;
import co.cask.cdap.api.spark.AbstractSpark;
import co.cask.cdap.api.spark.JavaSparkExecutionContext;
import co.cask.cdap.api.spark.JavaSparkMain;
import org.apache.spark.api.java.JavaPairRDD;
import org.apache.spark.api.java.JavaSparkContext;
import org.apache.spark.api.java.function.PairFunction;
import scala.Tuple2;
import java.util.HashMap;
import java.util.Map;
/**
*
*/
public class FileCountSparkProgram extends AbstractSpark implements JavaSparkMain {
@Override
protected void configure() {
setMainClass(FileCountSparkProgram.class);
}
@Override
public void run(JavaSparkExecutionContext sec) throws Exception {
JavaSparkContext jsc = new JavaSparkContext();
String input = sec.getRuntimeArguments().get("input");
String output = sec.getRuntimeArguments().get("output");
// read the dataset
JavaPairRDD<Long, String> inputData = sec.fromDataset(input);
JavaPairRDD<String, Integer> stringLengths = transformRDD(inputData);
// write the character count to dataset
sec.saveAsDataset(stringLengths, output);
String inputPartitionTime = sec.getRuntimeArguments().get("inputKey");
String outputPartitionTime = sec.getRuntimeArguments().get("outputKey");
// read and write datasets with dataset arguments
if (inputPartitionTime != null && outputPartitionTime != null) {
Map<String, String> inputArgs = new HashMap<>();
TimePartitionedFileSetArguments.setInputStartTime(inputArgs, Long.parseLong(inputPartitionTime) - 100);
TimePartitionedFileSetArguments.setInputEndTime(inputArgs, Long.parseLong(inputPartitionTime) + 100);
// read the dataset with user custom dataset args
JavaPairRDD<Long, String> customPartitionData = sec.fromDataset(input, inputArgs);
// create a new RDD with the same key but with a new value which is the length of the string
JavaPairRDD<String, Integer> customPartitionStringLengths = transformRDD(customPartitionData);
// write the character count to dataset with user custom dataset args
Map<String, String> outputArgs = new HashMap<>();
TimePartitionedFileSetArguments.setOutputPartitionTime(outputArgs, Long.parseLong(outputPartitionTime));
sec.saveAsDataset(customPartitionStringLengths, output, outputArgs);
}
}
private JavaPairRDD<String, Integer> transformRDD(JavaPairRDD<Long, String> inputData) {
// create a new RDD with the same key but with a new value which is the length of the string
return inputData.mapToPair(
new PairFunction<Tuple2<Long, String>, String, Integer>() {
@Override
public Tuple2<String, Integer> call(Tuple2<Long, String> pair) throws Exception {
return new Tuple2<>(pair._2(), pair._2().length());
}
});
}
}