第一階段:Spark streaming、spark sql、kafka、spark內核原理(必須有一個大型項目經驗);
第二階段:spark運行的各種環境,各種故障的解決,性能優化(精通spark內核、運行原理);
第三階段:流處理、機器學習爲鰲頭,需要首先掌握前兩個階段的內容;
跟隨王家林老師的零基礎講解,注重動手實戰,成爲spark高數,笑傲大數據之林!
第一部分學習筆記
/**
* Scala隱式轉換和併發編程
* 1、Scala隱式徹底詳解 隱式參數 隱式類 隱式方法 隱式對象
* 2、Scala併發編程詳解
*/
object Essay {
def main(args: Array[String]): Unit = {
//類擴展
//implicit conversion function 隱式轉換函數 fileTorichFile
implicit def rddToSequenceFileRDDFunctions[K <% Writable: ClassTag, V <% Writable: ClassTag](
rdd: RDD[(K, V)]) = new SequenceFileRDDFunctions(rdd)
implicit def rddToOrderedRDDFunctions[K : Ordering : ClassTag, V: ClassTag](
rdd: RDD[(K, V)]) =
new OrderedRDDFunctions[K, V, (K, V)](rdd)
class Person(val name: String) //val 定義了的變量可以通過類的實例訪問
//class Engineer(val name: String,val salary : Double)
//new Person("Spark").code
class Engineer(val name: String,val salary : Double){
def code = println("Coding ....")
}
//def toCode(p:Person){
// p.code
//}
//隱式轉化 當前上下文
implicit def person2Enginner(p: Person):Engineer ={
new Engineer(p.name,1000)
}
def toCode(p:Person){
p.code
}
toCode(new Person("Scala"))
//隱式參數
//注入隱式值
//implicit val
//implicit val
//隱式參數類型的伴生對象中去找隱式值
class Level(val level : Int)
def toWorker(name : String)(implicit l : Level)
= println(name + " : " + l.level)
implicit val level = new Level(8)
toWorker("Spark")
}
implicit val default:String = "Flink"
//}
object Param{
def print(content:String)(implicit language:String){
println(language+":"+content)
}
}
object Implicit_Parameters {
def main(args: Array[String]) {
Param.print("Spark")("Scala")
import Context_Implicits._
Param.print("Hadoop")
}
}
class RicherFile(val file:File){
def read = Source.fromFile(file.getPath()).mkString
}
class File_Implicits( path: String) extends File(path)
object File_Implicits{
implicit def file2RicherFile(file:File)= new RicherFile(file) //File -> RicherFile
}
object Implicits_Internals {
def main(args: Array[String]) {
val file = new File_Implicits("content.txt")
println(file.read)
}
}
///Actor 類似Thread Java 共享全局變量的加鎖機制
//akka 核心是Actor
//spark1.6.0自主內存管理
/* class HiActor extends Actor{
def act(){ //相當run
while(true){
while(true){
case name:String => println(name)
}
}
}
}*/
class HiActor extends Actor{
def act(){
while(true){
receive { //Actor收消息的方法
case name: String => println(name)
}
}
}
}
val actor = new HiActor
actor.start()
actor ! "Spark"
}
//Master Worker 都是一個Actor
case class Basic(name : String,age : Int)
case class Worker(name: String ,age : Int)
class basicActor extends Actor{
def act(){
while(true){
receive{
case Basic(name, age) => println("Basic information " +name + " "+age)
case Worker(name,age) => println("Worker information " +name + " "+age)
}
}
}
}
val b = new basicActor
b.start()
b ! Worker("Spark", 7)
//!?: 必須等到Actor消息處理完 同步
//feture
//DAGScheduler Master Worker