spark java API 实现二次排序

package com.spark.sort;

import java.io.Serializable;

import scala.math.Ordered;

public class SecondSortKey implements Serializable, Ordered<SecondSortKey> {
	/**
	 * serialVersionUID
	 */
	private static final long serialVersionUID = -2749925310062789494L;
	private String first;
	private long second;

	public SecondSortKey(String first, long second) {
		super();
		this.first = first;
		this.second = second;
	}

	public String getFirst() {
		return first;
	}

	public void setFirst(String first) {
		this.first = first;
	}

	public long getSecond() {
		return second;
	}

	public void setSecond(long second) {
		this.second = second;
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((first == null) ? 0 : first.hashCode());
		result = prime * result + (int) (second ^ (second >>> 32));
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		SecondSortKey other = (SecondSortKey) obj;
		if (first == null) {
			if (other.first != null)
				return false;
		} else if (!first.equals(other.first))
			return false;
		if (second != other.second)
			return false;
		return true;
	}

	@Override
	public boolean $greater(SecondSortKey that) {
		if (this.first.compareTo(that.getFirst()) > 0) {
			return true;
		} else if (this.first.equals(that.getFirst()) && this.second > that.getSecond()) {
			return true;
		}
		return false;
	}

	@Override
	public boolean $greater$eq(SecondSortKey that) {
		if (this.$greater(that)) {
			return true;
		}else if(this.first.equals(that.getFirst()) && this.second == that.getSecond()){
			return true;
		}
		return false;
	}

	@Override
	public boolean $less(SecondSortKey that) {
		if (this.first.compareTo(that.getFirst()) < 0) {
			return true;
		} else if (this.first.equals(that.getFirst()) && this.second < that.getSecond()) {
			return true;
		}
		return false;
	}

	@Override
	public boolean $less$eq(SecondSortKey that) {
		if (this.$less(that)) {
			return true;
		}else if(this.first.equals(that.getFirst()) && this.second == that.getSecond()){
			return true;
		}
		return false;
	}

	@Override
	public int compare(SecondSortKey that) {
		if (this.first.compareTo(that.getFirst()) != 0) {
			return this.first.compareTo(that.getFirst());
		} else {
			return (int) (this.second - that.getSecond());
		}
	}

	@Override
	public int compareTo(SecondSortKey that) {
		if (this.first.compareTo(that.getFirst()) != 0) {
			return this.first.compareTo(that.getFirst());
		} else {
			return (int) (this.second - that.getSecond());
		}
	}

}

　　

package com.spark.sort;
 2 
 3 import org.apache.spark.SparkConf;
 4 import org.apache.spark.api.java.JavaPairRDD;
 5 import org.apache.spark.api.java.JavaRDD;
 6 import org.apache.spark.api.java.JavaSparkContext;
 7 import org.apache.spark.api.java.function.Function;
 8 import org.apache.spark.api.java.function.PairFunction;
 9 
10 import scala.Tuple2;
11 
12 public class SecondSort {
13 
14     public static void main(String[] args) {
15         SparkConf sparkConf = new SparkConf().setAppName("secondsort").setMaster("local");
16         JavaSparkContext jsc = new JavaSparkContext(sparkConf);
17         JavaRDD<String> textFileRDD = jsc.textFile("D:\\test\\input\\sort");
18         JavaPairRDD<SecondSortKey,String> pairRDD = textFileRDD.mapToPair(new PairFunction<String, SecondSortKey, String>() {
19             @Override
20             public Tuple2<SecondSortKey, String> call(String t) throws Exception {
21                 String[] split = t.split("\t");
22                 String first = split[0];
23                 Long second = Long.valueOf(split[1]);
24                 SecondSortKey ssk = new SecondSortKey(first, second);
25                 return new Tuple2<SecondSortKey, String>(ssk, t);
26             }
27         });
28         
29         //排序
30         JavaPairRDD<SecondSortKey, String> sortByKeyRDD =pairRDD.sortByKey();
31         
32         //过滤自定义的key
33         JavaRDD<String> mapRDD = sortByKeyRDD.map(new Function<Tuple2<SecondSortKey,String>, String>() {
34 
35             @Override
36             public String call(Tuple2<SecondSortKey, String> v1) throws Exception {
37                 
38                 return v1._2;
39             }
40         });
41         
42         mapRDD.saveAsTextFile("D:\\test\\output\\sort");
43         
44         jsc.close();
45     }
46     
47     
48 }

　　

源数据：

a 12
a 2
b 26
c 85
ab 32
ab 23
ac 12
b 85
a 36
b 69
c 25

排序之后：

a 2
a 12
a 36
ab 23
ab 32
ac 12
b 26
b 69
b 85
c 25
c 85