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WordCount.java
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WordCount.java
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/*
* Copyright (C) 2021 Google LLC
*
* 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 com.google.cloud.dataproc.templates.word;
import static com.google.cloud.dataproc.templates.util.TemplateConstants.WORD_COUNT_INPUT_PATH_PROP;
import static com.google.cloud.dataproc.templates.util.TemplateConstants.WORD_COUNT_OUTPUT_PATH_PROP;
import com.google.cloud.dataproc.templates.BaseTemplate;
import java.util.Arrays;
import org.apache.spark.SparkConf;
import org.apache.spark.api.java.JavaPairRDD;
import org.apache.spark.api.java.JavaRDD;
import org.apache.spark.api.java.JavaSparkContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import scala.Tuple2;
public class WordCount implements BaseTemplate {
private static final Logger LOGGER = LoggerFactory.getLogger(WordCount.class);
@Override
public void runTemplate() {
String inputPath = getProperties().getProperty(WORD_COUNT_INPUT_PATH_PROP);
String outputPath = getProperties().getProperty(WORD_COUNT_OUTPUT_PATH_PROP);
LOGGER.info("Starting word count spark job, inputPath:{},outputPath:{}", inputPath, outputPath);
JavaSparkContext sparkContext = new JavaSparkContext(new SparkConf().setAppName("Word Count"));
JavaRDD<String> lines = sparkContext.textFile(inputPath);
JavaRDD<String> words =
lines.flatMap((String line) -> Arrays.asList(line.split(" ")).iterator());
JavaPairRDD<String, Integer> wordCounts =
words
.mapToPair((String word) -> new Tuple2<>(word, 1))
.reduceByKey((Integer count1, Integer count2) -> count1 + count2);
wordCounts.saveAsTextFile(outputPath);
}
public void validateInput() {
LOGGER.info(
"No validation has been specified for this class, hence the method contains only a logger statement");
}
}