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Commitbd2d382

Browse files
author
James Lee
committed
improve sort examples
1 parentd119b95 commitbd2d382

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3 files changed

+14
-34
lines changed

3 files changed

+14
-34
lines changed

‎src/main/java/com/sparkTutorial/pairRdd/sort/sortbykey/AverageHousePriceSolution.javarenamed to‎src/main/java/com/sparkTutorial/pairRdd/sort/AverageHousePriceSolution.java

Lines changed: 7 additions & 19 deletions
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
packagecom.sparkTutorial.pairRdd.sort.sortbykey;
1+
packagecom.sparkTutorial.pairRdd.sort;
22

33

44
importcom.sparkTutorial.pairRdd.aggregation.reducebykey.housePrice.AvgCount;
@@ -8,38 +8,26 @@
88
importorg.apache.spark.api.java.JavaPairRDD;
99
importorg.apache.spark.api.java.JavaRDD;
1010
importorg.apache.spark.api.java.JavaSparkContext;
11-
importorg.apache.spark.api.java.function.Function2;
12-
importorg.apache.spark.api.java.function.PairFunction;
1311
importscala.Tuple2;
1412

15-
importjava.util.Map;
16-
1713
publicclassAverageHousePriceSolution {
1814

1915
publicstaticvoidmain(String[]args)throwsException {
20-
2116
Logger.getLogger("org").setLevel(Level.ERROR);
2217
SparkConfconf =newSparkConf().setAppName("wordCounts").setMaster("local[3]");
2318
JavaSparkContextsc =newJavaSparkContext(conf);
2419

2520
JavaRDD<String>lines =sc.textFile("in/RealEstate.csv");
26-
2721
JavaRDD<String>cleanedLines =lines.filter(line -> !line.contains("Bedrooms"));
2822

29-
JavaPairRDD<String,AvgCount>housePricePairRdd =cleanedLines.mapToPair(
30-
(PairFunction<String,String,AvgCount>)line ->
31-
newTuple2<>(line.split(",")[3],
32-
newAvgCount(1,Double.parseDouble(line.split(",")[2]))));
33-
34-
JavaPairRDD<String,AvgCount>housePriceTotal =housePricePairRdd.reduceByKey(
35-
(Function2<AvgCount,AvgCount,AvgCount>) (x,y) ->
36-
newAvgCount(x.getCount() +y.getCount(),x.getTotal() +y.getTotal()));
37-
23+
JavaPairRDD<Integer,AvgCount>housePricePairRdd =cleanedLines.mapToPair(
24+
line ->newTuple2<>(Integer.valueOf(line.split(",")[3]),
25+
newAvgCount(1,Double.parseDouble(line.split(",")[2]))));
3826

39-
JavaPairRDD<Integer,Double>housePriceAvg =housePriceTotal.mapToPair(
40-
(PairFunction<Tuple2<String,AvgCount>,Integer,Double>)total ->
41-
newTuple2<>(Integer.valueOf(total._1()),total._2().getTotal()/total._2().getCount()));
27+
JavaPairRDD<Integer,AvgCount>housePriceTotal =housePricePairRdd.reduceByKey(
28+
(x,y) ->newAvgCount(x.getCount() +y.getCount(),x.getTotal() +y.getTotal()));
4229

30+
JavaPairRDD<Integer,Double>housePriceAvg =housePriceTotal.mapValues(avgCount ->avgCount.getTotal()/avgCount.getCount());
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4432
JavaPairRDD<Integer,Double>sortedHousePriceAvg =housePriceAvg.sortByKey();
4533

‎src/main/java/com/sparkTutorial/pairRdd/sort/sortbykey/SortedWorldCountProblem.javarenamed to‎src/main/java/com/sparkTutorial/pairRdd/sort/SortedWorldCountProblem.java

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
packagecom.sparkTutorial.pairRdd.sort.sortbykey;
1+
packagecom.sparkTutorial.pairRdd.sort;
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33

44
publicclassSortedWorldCountProblem {
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
packagecom.sparkTutorial.pairRdd.sort.sortbykey;
1+
packagecom.sparkTutorial.pairRdd.sort;
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33

44
importorg.apache.log4j.Level;
@@ -7,8 +7,6 @@
77
importorg.apache.spark.api.java.JavaPairRDD;
88
importorg.apache.spark.api.java.JavaRDD;
99
importorg.apache.spark.api.java.JavaSparkContext;
10-
importorg.apache.spark.api.java.function.Function2;
11-
importorg.apache.spark.api.java.function.PairFunction;
1210
importscala.Tuple2;
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1412
importjava.util.Arrays;
@@ -24,24 +22,18 @@ public static void main(String[] args) throws Exception {
2422
JavaRDD<String>lines =sc.textFile("in/word_count.text");
2523
JavaRDD<String>wordRdd =lines.flatMap(line ->Arrays.asList(line.split(" ")).iterator());
2624

27-
JavaPairRDD<String,Integer>wordPairRdd =wordRdd.mapToPair(
28-
(PairFunction<String,String,Integer>)word ->newTuple2<>(word,1));
29-
30-
JavaPairRDD<String,Integer>wordToCountPairs =wordPairRdd.reduceByKey((Function2<Integer,Integer,Integer>) (x,y) ->x +y);
31-
32-
JavaPairRDD<Integer,String>countToWordParis =wordToCountPairs.mapToPair(
33-
(PairFunction<Tuple2<String,Integer>,Integer,String>)wordToCount ->newTuple2<>(wordToCount._2(),
34-
wordToCount._1()));
25+
JavaPairRDD<String,Integer>wordPairRdd =wordRdd.mapToPair(word ->newTuple2<>(word,1));
26+
JavaPairRDD<String,Integer>wordToCountPairs =wordPairRdd.reduceByKey((x,y) ->x +y);
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28+
JavaPairRDD<Integer,String>countToWordParis =wordToCountPairs.mapToPair(wordToCount ->newTuple2<>(wordToCount._2(),
29+
wordToCount._1()));
3630
JavaPairRDD<Integer,String>sortedCountToWordParis =countToWordParis.sortByKey(false);
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3832
JavaPairRDD<String,Integer>sortedWordToCountPairs =sortedCountToWordParis
39-
.mapToPair((PairFunction<Tuple2<Integer,String>,String,Integer>)countToWord ->newTuple2<>(countToWord._2(),
40-
countToWord._1()));
33+
.mapToPair(countToWord ->newTuple2<>(countToWord._2(),countToWord._1()));
4134

4235
for (Tuple2<String,Integer>wordToCount :sortedWordToCountPairs.collect()) {
4336
System.out.println(wordToCount._1() +" : " +wordToCount._2());
44-
4537
}
4638
}
4739
}

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