代码如下（网上摘录代码）：
package com.gree.test;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import org.apache.spark.SparkConf;
import org.apache.spark.api.java.function.FlatMapFunction;
import org.apache.spark.api.java.function.Function2;
import org.apache.spark.api.java.function.PairFunction;
import org.apache.spark.streaming.Durations;
import org.apache.spark.streaming.api.java.JavaDStream;
import org.apache.spark.streaming.api.java.JavaPairDStream;
import org.apache.spark.streaming.api.java.JavaReceiverInputDStream;
import org.apache.spark.streaming.api.java.JavaStreamingContext;
import com.google.common.base.Optional;
import scala.Tuple2;
public class OnlineWordCount {
public static void main(String[] args) {
SparkConf conf = new SparkConf().setAppName("wordcount").setMaster("local[2]");
JavaStreamingContext jssc = new JavaStreamingContext(conf,Durations.seconds(5));
jssc.checkpoint("hdfs://spark001:9000/wordcount_checkpoint");
JavaReceiverInputDStream lines = jssc.socketTextStream("spark001", 9999);
JavaDStream words = lines.flatMap(new FlatMapFunction(){
private static final long serialVersionUID = 1L;
@Override
public Iterator call(String line) throws Exception {
return Arrays.asList(line.split(" ")).iterator();
}
});
JavaPairDStream pairs = words.mapToPair(new PairFunction(){
private static final long serialVersionUID = 1L;
@Override
public Tuple2 call(String word) throws Exception {
return new Tuple2(word, 1);
}
});
JavaPairDStream wordcounts = pairs.updateStateByKey(
new Function2, Optional, Optional>(){
private static final long serialVersionUID = 1L;
@Override
public Optional call(List values, Optional state) throws Exception {
Integer newValue = 0;
if(state.isPresent()){
newValue = state.get();
}
for(Integer value : values){
newValue += value;
}
return Optional.of(newValue);
}
});
wordcounts.print();
jssc.start();
try {
jssc.awaitTermination();
} catch (InterruptedException e) {
e.printStackTrace();
}
jssc.close();
}
}
报错位置为updateStateByKey位置：
The method updateStateByKey(Function2,Optional,Optional>) in the type JavaPairDStream is not applicable for the arguments (new Function2,Optional,Optional>(){})
跪求大神解决。。。谢谢
