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baghelamit/JavaDemoOne.java

Last active June 4, 2018 10:23
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Updated pom.xml and Java class to work with new spark and cassandra connector versions. This code is from https://gist.github.com/jacek-lewandowski/278bfc936ca990bee35a
Raw
JavaDemoOne.java
import static com.datastax.spark.connector.japi.CassandraJavaUtil.javaFunctions;
import java.io.Serializable;
import java.math.BigDecimal;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Random;
import java.util.UUID;
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.apache.spark.api.java.Optional;
import org.apache.spark.api.java.function.FlatMapFunction;
import org.apache.spark.api.java.function.Function;
import org.apache.spark.api.java.function.Function2;
import org.apache.spark.api.java.function.PairFlatMapFunction;
import com.datastax.driver.core.Session;
import com.datastax.spark.connector.cql.CassandraConnector;
import com.datastax.spark.connector.japi.CassandraJavaUtil;
import scala.Tuple2;
public class JavaDemoOne implements Serializable {
private transient SparkConf conf;
private JavaDemoOne(SparkConf conf) {
this.conf = conf;
}
private void run() {
JavaSparkContext sc = new JavaSparkContext(conf);
generateData(sc);
compute(sc);
showResults(sc);
sc.stop();
}
private void generateData(JavaSparkContext sc) {
CassandraConnector connector = CassandraConnector.apply(sc.getConf());
// Prepare the schema
try (Session session = connector.openSession()) {
session.execute("DROP KEYSPACE IF EXISTS java_api");
session.execute("CREATE KEYSPACE java_api WITH replication = {'class': 'SimpleStrategy', 'replication_factor': 1}");
session.execute("CREATE TABLE java_api.products (id INT PRIMARY KEY, name TEXT, parents LIST<INT>)");
session.execute("CREATE TABLE java_api.sales (id UUID PRIMARY KEY, product INT, price DECIMAL)");
session.execute("CREATE TABLE java_api.summaries (product INT PRIMARY KEY, summary DECIMAL)");
}
// Prepare the products hierarchy
List<Product> products = Arrays.asList(
new Product(0, "All products", Collections.<Integer>emptyList()),
new Product(1, "Product A", Arrays.asList(0)),
new Product(4, "Product A1", Arrays.asList(0, 1)),
new Product(5, "Product A2", Arrays.asList(0, 1)),
new Product(2, "Product B", Arrays.asList(0)),
new Product(6, "Product B1", Arrays.asList(0, 2)),
new Product(7, "Product B2", Arrays.asList(0, 2)),
new Product(3, "Product C", Arrays.asList(0)),
new Product(8, "Product C1", Arrays.asList(0, 3)),
new Product(9, "Product C2", Arrays.asList(0, 3))
);
JavaRDD<Product> productsRDD = sc.parallelize(products);
javaFunctions(productsRDD).writerBuilder("java_api", "products", CassandraJavaUtil.mapToRow(Product.class)).saveToCassandra();
JavaRDD<Sale> salesRDD = productsRDD.filter(new Function<Product, Boolean>() {
@Override
public Boolean call(Product product) throws Exception {
return product.getParents().size() == 2;
}
}).flatMap(new FlatMapFunction<Product, Sale>() {
@Override
public Iterator<Sale> call(Product product) throws Exception {
Random random = new Random();
List<Sale> sales = new ArrayList<>(1000);
for (int i = 0; i < 1000; i++) {
sales.add(new Sale(UUID.randomUUID(), product.getId(), BigDecimal.valueOf(random.nextDouble())));
}
return sales.iterator();
}
});
javaFunctions(salesRDD).writerBuilder("java_api", "sales", CassandraJavaUtil.mapToRow(Sale.class)).saveToCassandra();
}
private void compute(JavaSparkContext sc) {
JavaPairRDD<Integer, Product> productsRDD = javaFunctions(sc)
.cassandraTable("java_api", "products", CassandraJavaUtil.mapRowTo(Product.class))
.keyBy(new Function<Product, Integer>() {
@Override
public Integer call(Product product) throws Exception {
return product.getId();
}
});
JavaPairRDD<Integer, Sale> salesRDD = javaFunctions(sc)
.cassandraTable("java_api", "sales", CassandraJavaUtil.mapRowTo(Sale.class))
.keyBy(new Function<Sale, Integer>() {
@Override
public Integer call(Sale sale) throws Exception {
return sale.getProduct();
}
});
JavaPairRDD<Integer, Tuple2<Sale, Product>> joinedRDD = salesRDD.join(productsRDD);
JavaPairRDD<Integer, BigDecimal> allSalesRDD = joinedRDD.flatMapToPair(new PairFlatMapFunction<Tuple2<Integer, Tuple2<Sale, Product>>, Integer, BigDecimal>() {
@Override
public Iterator<Tuple2<Integer, BigDecimal>> call(Tuple2<Integer, Tuple2<Sale, Product>> input) throws Exception {
Tuple2<Sale, Product> saleWithProduct = input._2();
List<Tuple2<Integer, BigDecimal>> allSales = new ArrayList<>(saleWithProduct._2().getParents().size() + 1);
allSales.add(new Tuple2<>(saleWithProduct._1().getProduct(), saleWithProduct._1().getPrice()));
for (Integer parentProduct : saleWithProduct._2().getParents()) {
allSales.add(new Tuple2<>(parentProduct, saleWithProduct._1().getPrice()));
}
return allSales.iterator();
}
});
JavaRDD<Summary> summariesRDD = allSalesRDD.reduceByKey(new Function2<BigDecimal, BigDecimal, BigDecimal>() {
@Override
public BigDecimal call(BigDecimal v1, BigDecimal v2) throws Exception {
return v1.add(v2);
}
}).map(new Function<Tuple2<Integer, BigDecimal>, Summary>() {
@Override
public Summary call(Tuple2<Integer, BigDecimal> input) throws Exception {
return new Summary(input._1(), input._2());
}
});
javaFunctions(summariesRDD).writerBuilder("java_api", "summaries", CassandraJavaUtil.mapToRow(Summary.class)).saveToCassandra();
}
private void showResults(JavaSparkContext sc) {
JavaPairRDD<Integer, Summary> summariesRdd = javaFunctions(sc)
.cassandraTable("java_api", "summaries", CassandraJavaUtil.mapRowTo(Summary.class))
.keyBy(new Function<Summary, Integer>() {
@Override
public Integer call(Summary summary) throws Exception {
return summary.getProduct();
}
});
JavaPairRDD<Integer, Product> productsRdd = javaFunctions(sc)
.cassandraTable("java_api", "products", CassandraJavaUtil.mapRowTo(Product.class))
.keyBy(new Function<Product, Integer>() {
@Override
public Integer call(Product product) throws Exception {
return product.getId();
}
});
List<Tuple2<Product, Optional<Summary>>> results = productsRdd.leftOuterJoin(summariesRdd).values().collect();
for (Tuple2<Product, Optional<Summary>> result : results) {
System.out.println(result);
}
}
public static void main(String[] args) {
SparkSession spark = SparkSession
.builder()
.appName("JavaDemoOne")
.config("spark.cassandra.connection.host", "localhost")
.config("spark.cassandra.connection.port", "9042")
.master("local[2]")
.getOrCreate();
JavaDemoOne app = new JavaDemoOne(spark.sparkContext().conf());
app.run();
}
public static class Product implements Serializable {
private Integer id;
private String name;
private List<Integer> parents;
public Product() { }
public Product(Integer id, String name, List<Integer> parents) {
this.id = id;
this.name = name;
this.parents = parents;
}
public Integer getId() { return id; }
public void setId(Integer id) { this.id = id; }
public String getName() { return name; }
public void setName(String name) { this.name = name; }
public List<Integer> getParents() { return parents; }
public void setParents(List<Integer> parents) { this.parents = parents; }
@Override
public String toString() {
return MessageFormat.format("Product'{'id={0}, name=''{1}'', parents={2}'}'", id, name, parents);
}
}
public static class Sale implements Serializable {
private UUID id;
private Integer product;
private BigDecimal price;
public Sale() { }
public Sale(UUID id, Integer product, BigDecimal price) {
this.id = id;
this.product = product;
this.price = price;
}
public UUID getId() { return id; }
public void setId(UUID id) { this.id = id; }
public Integer getProduct() { return product; }
public void setProduct(Integer product) { this.product = product; }
public BigDecimal getPrice() { return price; }
public void setPrice(BigDecimal price) { this.price = price; }
@Override
public String toString() {
return MessageFormat.format("Sale'{'id={0}, product={1}, price={2}'}'", id, product, price);
}
}
public static class Summary implements Serializable {
private Integer product;
private BigDecimal summary;
public Summary() { }
public Summary(Integer product, BigDecimal summary) {
this.product = product;
this.summary = summary;
}
public Integer getProduct() { return product; }
public void setProduct(Integer product) { this.product = product; }
public BigDecimal getSummary() { return summary; }
public void setSummary(BigDecimal summary) { this.summary = summary; }
@Override
public String toString() {
return MessageFormat.format("Summary'{'product={0}, summary={1}'}'", product, summary);
}
}
}
Raw
pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.datastax.spark.demo</groupId>
<artifactId>java-demo-one</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-core_2.11</artifactId>
<version>2.0.2</version>
</dependency>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-sql_2.11</artifactId>
<version>2.0.2</version>
</dependency>
<dependency>
<groupId>com.datastax.spark</groupId>
<artifactId>spark-cassandra-connector_2.11</artifactId>
<version>2.0.0-M3</version>
</dependency>
<dependency>
<groupId>com.datastax.cassandra</groupId>
<artifactId>cassandra-driver-core</artifactId>
<version>3.1.2</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
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