Question

我正在尝试通过spark中的流数据运行SQL查询。这看起来非常简单，但是当我尝试它时，我收到错误表未找到： tablename ＆gt; 。它无法找到我已注册的表格。

将Spark SQL与批处理数据一起使用可以正常工作，因此我认为它与我如何调用streamingcontext.start（）有关。有什么想法是什么问题？这是代码：

import org.apache.spark.streaming.{Seconds, StreamingContext}
import org.apache.spark.streaming.StreamingContext._
import org.apache.spark.sql.SQLContext

object Streaming {

def main(args: Array[String]) {

    val sparkConf = new SparkConf().setMaster("local").setAppName("HdfsWordCount")
    val sc = new SparkContext(sparkConf)
    // Create the context
    val ssc = new StreamingContext(sc, Seconds(2))

    val sqc = new SQLContext(sc);
    import sqc.createSchemaRDD

    // Create the FileInputDStream on the directory and use the
    // stream to count words in new files created
    val lines = ssc.textFileStream("C:/Users/pravesh.jain/Desktop/people.txt")
    lines.foreachRDD(rdd=>rdd.map(_.split(",")).map(p => Persons(p(0), p(1).trim.toInt)).registerAsTable("data"))
    // lines.foreachRDD(rdd=>rdd.foreach(println))
    val teenagers = sqc.sql("SELECT name FROM data WHERE age >= 13 AND age <= 19")
    ssc.start()
    ssc.awaitTermination()
  }
}

欢迎任何建议。感谢。

Answer 1

我知道了这个问题。您必须在foreachRDD函数中查询数据，否则无法识别该表。这样的事情有效：

import org.apache.spark.streaming.{Seconds, StreamingContext}
import org.apache.spark.streaming.StreamingContext._
import org.apache.spark.sql.SQLContext
import org.apache.spark.streaming.Duration

object Mlist {

  def main(args: Array[String]) {

    val sparkConf = new SparkConf().setMaster("local").setAppName("HdfsWordCount")
    val sc = new SparkContext(sparkConf)
    // Create the context
    val ssc = new StreamingContext(sc, Seconds(2))

    val lines = ssc.textFileStream("C:/Users/pravesh.jain/Desktop/people.txt")
    lines.foreachRDD(rdd=>rdd.foreach(println))

    val sqc = new SQLContext(sc);
    import sqc.createSchemaRDD

    // Create the FileInputDStream on the directory and use the
    // stream to count words in new files created

    lines.foreachRDD(rdd=>{
      rdd.map(_.split(",")).map(p => Persons(p(0), p(1).trim.toInt)).registerAsTable("data")
      val teenagers = sqc.sql("SELECT name FROM data WHERE age >= 13 AND age <= 19")
      teenagers.foreach(println)
    })

    ssc.start()
    ssc.awaitTermination()
  }
}

试图通过Spark Streaming运行SparkSQL

1 个答案: