64 lines
2.2 KiB
Java
64 lines
2.2 KiB
Java
package eu.dnetlib.jobs;
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import com.fasterxml.jackson.databind.DeserializationFeature;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import eu.dnetlib.support.ArgumentApplicationParser;
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import org.apache.commons.io.IOUtils;
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import org.apache.hadoop.conf.Configuration;
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import org.apache.hadoop.fs.FileSystem;
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import org.apache.hadoop.fs.Path;
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import org.apache.spark.SparkConf;
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import org.apache.spark.sql.Dataset;
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import org.apache.spark.sql.SaveMode;
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import org.apache.spark.sql.SparkSession;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.io.Serializable;
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import java.util.stream.Collectors;
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public abstract class AbstractSparkJob implements Serializable {
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protected static final int NUM_PARTITIONS = 1000;
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protected static final ObjectMapper OBJECT_MAPPER = new ObjectMapper()
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.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
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public ArgumentApplicationParser parser; // parameters for the spark action
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public SparkSession spark; // the spark session
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public AbstractSparkJob() {}
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public AbstractSparkJob(ArgumentApplicationParser parser, SparkSession spark) {
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this.parser = parser;
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this.spark = spark;
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}
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abstract void run() throws IOException;
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protected static SparkSession getSparkSession(SparkConf conf) {
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return SparkSession.builder().config(conf).getOrCreate();
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}
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protected static <T> void save(Dataset<T> dataset, String outPath, SaveMode mode) {
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dataset.write().option("compression", "gzip").mode(mode).json(outPath);
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}
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protected static String readFileFromHDFS(String filePath) throws IOException {
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Path path=new Path(filePath);
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FileSystem fs = FileSystem.get(new Configuration());
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BufferedReader br=new BufferedReader(new InputStreamReader(fs.open(path)));
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try {
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return String.join("", br.lines().collect(Collectors.toList()));
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} finally {
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br.close();
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}
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}
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public static String readResource(String path, Class<? extends AbstractSparkJob> clazz) throws IOException {
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return IOUtils.toString(clazz.getResourceAsStream(path));
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}
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} |