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这篇文章主要讲解了“SparkStreaming的实现和使用方法”,文中的讲解内容简单清晰,易于学习与理解,下面请大家跟着小编的思路慢慢深入,一起来研究和学习“SparkStreaming的实现和使用方法”吧!
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package sparkstreaming02 import org.apache.spark.{SparkConf, SparkContext} import scala.collection.mutable.ListBuffer object Demo1 { def main(args: Array[String]): Unit = { val conf = new SparkConf().setAppName("Demo1").setMaster("local[2]") val sc = new SparkContext(conf) val input1 = new ListBuffer[(String,Long)] input1.append(("www.xinlang.com", 8888)) input1.append(("www.xinalng.com", 9999)) input1.append(("www.baidu.com", 7777)) val data1 = sc.parallelize(input1) //进行join一定要是key,value形式的 val input2 = new ListBuffer[(String,Boolean)] input2.append(("www.baidu.com",true)) val data2 = sc.parallelize(input2) data1.leftOuterJoin(data2) .filter(x => { x._2._2.getOrElse(false) != true }).map(x => (x._1,x._2._1)) .collect().foreach(println) } }
package sparkstreaming02 import org.apache.spark.SparkConf import org.apache.spark.streaming.{Seconds, StreamingContext} import scala.collection.mutable.ListBuffer object Streaming { def main(args: Array[String]): Unit = { val conf = new SparkConf().setAppName("Streaming").setMaster("local[2]") val ssc = new StreamingContext(conf,Seconds(10)) val lines = ssc.socketTextStream("s201",9999) // 数据二: rdd val input2 = new ListBuffer[(String,Boolean)] input2.append(("www.baidu.com",true)) val data2 = ssc.sparkContext.parallelize(input2) lines.map(x=>(x.split(",")(0), x)).transform( rdd => { rdd.leftOuterJoin(data2) .filter(x => { x._2._2.getOrElse(false) != true //注意 join之后过滤 }).map(x => (x._1,x._2._1)) } ).print() ssc.start() ssc.awaitTermination() } }
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connect 在Driver端创建,record在executor,发过去序列化错误
解决:第一种把connect放到executor端 这样弊端是每条记录会生成一个connect太耗费资源 words.foreachRDD { rdd => rdd.foreach { record => val connection = createConnection() // executed at the driver val word = record._1 val count = record._2.toInt val sql = s"insert into wc (wc,count) values($word,$count)" connection.createStatement().execute(sql) }
package sparkstreaming02 import java.sql.DriverManager import org.apache.spark.SparkConf import org.apache.spark.streaming.{Seconds, StreamingContext} object MysqlStreaming { def main(args: Array[String]): Unit = { val conf = new SparkConf().setMaster("local[2]").setAppName("MysqlStreaming") val ssc = new StreamingContext(conf,Seconds(1)) val lines = ssc.socketTextStream("s201",9999) val words = lines.flatMap(x => x.split(",")).map((_,1)).reduceByKey(_+_) // words.foreachRDD { rdd => // val connection = createConnection() // executed at the driver // rdd.foreach { record => // val word = record._1 // val count = record._2 // val sql = s"insert into wc (word,count) values($word,$count)" // connection.createStatement().execute(sql) // } // } // words.foreachRDD { rdd => // rdd.foreach { record => // val connection = createConnection() // executed at the driver // val word = record._1 // val count = record._2.toInt // val sql = s"insert into wc (wc,count) values($word,$count)" // connection.createStatement().execute(sql) // } // } //最终的写法 words.foreachRDD { rdd => rdd.foreachPartition { partitionOfRecords => val connection = createConnection() partitionOfRecords.foreach( record =>{ val word = record._1 val count = record._2 val sql = s"insert into wc (wc,count) values('$word',$count)" connection.createStatement().execute(sql)} ) } } ssc.start() ssc.awaitTermination() } def createConnection() = { Class.forName("com.mysql.cj.jdbc.Driver") DriverManager.getConnection("jdbc:mysql://localhost:3306/hive?serverTimezone=UTC&useSSL=false","root","123456") } }
错误,插入数据库时,你要插入字符串要用'' 例如: val sql = s"insert into wc (wc,count) values($word,$count)" word是字符串,你要不加双引号就报这个错误 正确 val sql = s"insert into wc (wc,count) values('$word',$count)"
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