apache-spark - Spark Streaming 不从 Windows 中的本地目录读取文件

Question

public class StreamingWordCount implements Serializable { 

public static void main(String[] args) {    

    JavaStreamingContext jssc = new JavaStreamingContext("local[2]", "JavaWordCount",
            new Duration(1000));
    JavaDStream<String> data = jssc.textFileStream("D:/krishna/").cache();
    data.foreach(new Function<JavaRDD<String>, Void>() {

        public Void call(JavaRDD<String> rdd) throws Exception {
            List<String> output = rdd.collect();
            System.out.println("Sentences Collected from files " + output);
            return null;
        }
    });

    data.print();
    jssc.start();
    jssc.awaitTermination();
  }
}

我在 Windows 8 上独立使用 Spark。

JavaStreamingContext 仅适用于 HDFS 目录吗？

点击输出: This is output on console, Sentence collected from files is empty. I tried changing the directory, files. But still code is not picking files. This is my first code in Spark Streaming. Kindly help.

Answer 1

将批处理时间间隔减少 5 毫秒到 10 毫秒 如果任何作业将花费超过提供的批处理时间，则 jssc.awaitTermination() 方法将等待完成挂起的作业并自动处理批处理时间。