Github user guoxiaolongzte commented on the issue:
https://github.com/apache/spark/pull/17580
JavaDStream<String> lines = messages.map(new Function<Tuple2<String,
String>, String>() {
@Override
public String call(Tuple2<String, String> tuple2) {
return tuple2._2();
}
});
JavaDStream<String> words = lines.flatMap(new FlatMapFunction<String,
String>() {
@Override
public Iterator<String> call(String x) {
return Arrays.asList(SPACE.split(x)).iterator();
}
});
JavaPairDStream<String, Integer> wordCounts = words.mapToPair(
new PairFunction<String, String, Integer>() {
@Override
public Tuple2<String, Integer> call(String s) {
return new Tuple2<>(s, 1);
}
}).reduceByKey(new Function2<Integer, Integer, Integer>() {
@Override
public Integer call(Integer i1, Integer i2) {
return i1 + i2;
}
});
**The above code version in 2.1.0 release.It is only recently changed to
Scala grammar in apache master. I want to know why.Thank you!**@jerryshao
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