代码如下:
def main(args: Array[String]) {
if (args.length < 1) {
System.err.println("Usage: HdfsWordCount <directory>")
System.exit(1)
}
StreamingExamples.setStreamingLogLevels()
val sparkConf = new SparkConf().setAppName("HdfsWordCount")
sparkConf.setMaster("spark://h1:7077")
// Create the context
val ssc = new StreamingContext(sparkConf, Seconds(2))
// Create the FileInputDStream on the directory and use the
// stream to count words in new files created
val lines = ssc.textFileStream(args(0))
val words = lines.flatMap(_.split(" "))
val wordCounts = words.map(x => (x, 1)).reduceByKey(_ + _)
wordCounts.print()
wordCounts.saveAsTextFiles("word", "count")
ssc.start()
ssc.awaitTermination()
}
运行报错如下:
java.lang.ClassCastException: cannot assign instance of scala.collection.immutable.List$SerializationProxy to field org.apache.spark.rdd.RDD.org$apache$spark$rdd$RDD$$dependencies_ of type scala.collection.Seq in instance of org.apache.spark.rdd.ShuffledRDD
输入目录下只有一个文件,文件内容如下:
hank you
what is your name
my name is lili
nice to meet you
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