我试图保存Spark流输出到一个文件上的hdfs。现在，它没有保存任何文件。
这是我的密码：

StreamingExamples.setStreamingLogLevels();

SparkConf sparkConf = new SparkConf().setAppName("MyTestCOunt");
JavaStreamingContext ssc = new JavaStreamingContext(sparkConf,  new Duration(1000));

JavaReceiverInputDStream<String> lines = ssc.socketTextStream(args[0], Integer.parseInt(args[1]), StorageLevels.MEMORY_AND_DISK_SER);
JavaDStream<String> words = lines.flatMap(new FlatMapFunction<String, String>() {
                @Override
                public Iterable<String> call(String x) {
                 return  Lists.newArrayList(SPACE.split(x));
                }
      });

JavaPairDStream<String, Integer> wordCounts = words.mapToPair(
      new PairFunction<String, String, Integer>() {
        @Override
        public Tuple2<String, Integer> call(String s) {
                 return new Tuple2<String, Integer>(s, 1);
        }
      }).reduceByKey(new Function2<Integer, Integer, Integer>() {
        @Override
        public Integer call(Integer i1, Integer i2) {
          return i1 + i2;
        }
  }); 

wordCounts.print();
wordCounts.saveAsHadoopFiles("hdfs://mynamenode:8020/user/spark/mystream/","abc");
ssc.start();
ssc.awaitTermination();
``` `wordCounts.print()` 行，但不行 `wordCounts.saveAsHadoopFiles` ，知道为什么吗？
我运行以下命令：
1)  `nc -lk 9999` 2)  `./bin/run-example org.apache.spark.examples.streaming.NetworkWordCount localhost 9999` 提前谢谢。。！！！