第9课：IDEA下的spark程序开发
2016-01-30 19:55
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第9课：IDEA下的spark程序开发
1.下载IntelliJ IDEA:
http://www.jetbrains.com/idea/
选择社区版，要在centos上安装，需要下载.TARGZ，解压。
进入IDEA目录下的bin目录下，./idea.sh启动（需要提前安装好java，并设定好JAVA_HOME）
windows下需要下载.exe文件后双击安装。
安装时会出现下图所示界面时点击Install scala。安装完成后如下图：
安装完IDEA后启动IDEA，新建scala project。
点击File->new Project->scala->scala->next，如下图：
4. 指定JDK1.8.x和scala2.10.4。填写Project name为WordCount，选择Project SDK为java1.8.0_45，
选择scala SDK为scala-sdk-2.10.4后点击finish。
5.File－> Project Structure来设置工程的libraries,核心是添加spark的jar。
选择Libraries后点击+号后选择java。选择java是从jvm的角度考虑的。
6.添加spark的jar依赖，选择解压后的spark-1.6.0-bin-hadoop2.6.0目录中的lib/spark-assembly-1.6.0-hadoop2.6.0.jar
导入完成后选择Modules为WordCount后点击OK。
可以看到java和scala、spark的依赖都被加入到WordCount项目中了。
7. 在WordCount项目中的src上点击右键，选择new->package，包名为com.dt.spark。在包名上点击右键，选择new->scala class，选择Kind为object，填写Name为WordCount。
8. 编写代码如下：
package com.dt.spark
import org.apache.spark.SparkConf
import org.apache.spark.SparkContext
/**
* 使用scala开发本地测试的spark WordCount程序
* DT大数据梦工厂
* 新浪微博：p://weibo.com/ilovepains/
*/
object WordCount {
def main(args: Array[String]){
/*
* 第一步：创建spark的配置对象SparkConf，设置Spark程序运行时的配置信息
* 例如通过setMaster来设置程序要链接的Spark集群的Master的URL，如果设置
* 为local，则代表Spark程序在本地运行，特别适合于机器配置条件非常差（例如
* 只有1内存）的初学者
*/
val conf = new SparkConf() //创建SparkConf对象。因为是全局唯一的，所以使用new，不用工厂方法模式。
conf.setAppName("Wow, My First Spark App!") //设置应用程序的名称，在程序运行的监控界面可以看到名称
conf.setMaster("local") //此时程序在本地运行，不需要安装spark集群。
/**
* 第二步：创建SparkContext对象，
* SparkContext是Spark程序所有功能的唯一入口，无论是采用scala/java/Python/R等都必须有一个SParkContext，而且默认都只有一个。
* SparkContext核心作用：初始化应用程序运行时所需要的核心组件，包括DAGScheduler,TaskScheduler,Scheduler Backend,
* 同时还会负责Spark程序往Master注册程序等。SparkContext是整个Spark应用程序中最为重要的一个对象，
*
*/
val sc = new SparkContext(conf) //通过创建SparkContext对象，通过传入SparkConf实例来定制SPark地的具体参数和配置信息。
/*
* 第三步：根据具体的数据来源（/HBase/Local FS/DB/S3等）通过SparkContext创建RDD，
* RDD创建有三种基本方式：1.根据外部数据来源（如HDFS），2.根据Scala集合，3.由其他RDD操作产生
* 数据会被RDD划分成为一系列的Partitions，分配到每个Partition的数据属于一个Task的处理范畴，
*/
val lines = sc.textFile("D://programFiles//spark-1.6.0-bin-hadoop2.6//README.md", 1) //假设电脑只有1G内存，一个core。读取本地文件，设置partition
//也可以写成：l lines:RDD[String] = sc.textFile 类型推断
/**
* 第4步：对初始RDD进行Transformation级别的处理。例如map/filter等高阶函数等的编程
* 来进行具体的数据计算。第4.1步：将每一行的字符串拆分成单个的单词。
*/
val words = lines.flatMap { line => line.split(" ") } //对每一行的字符串进行单词拆分，map每次循环一行，将每一行的小集合通过flat合并成一个大集合
/**
* 第4.2步，在单词拆分的基础上对每个单词实例 进行计数为1，也就是word => (word,1)
*/
val pairs = words.map { word => (word,1) }
/**
* 第4.3步，在每个单词实例计数为1的基础上，统计每个单词在文件中出现的总次数。
*/
val wordCounts = pairs.reduceByKey(_+_) //对相同的Key,进行Value的累计（包括Local和Reduce级别同时 Reduce）
wordCounts.foreach(wordNumberPair => println(wordNumberPair._1 + " : " + wordNumberPair._2))
sc.stop() //把上下文去掉，释放资源
}
}
运行时的console结果：
"C:\Program Files\Java\jdk1.8.0_45\bin\java" -Didea.launcher.port=7532 "-Didea.launcher.bin.path=D:\programFiles\IntelliJIDEA\IntelliJ IDEA Community Edition 14.1.4\bin" -Dfile.encoding=GBK -classpath "C:\Program Files\Java\jdk1.8.0_45\jre\lib\charsets.jar;C:\Program
Files\Java\jdk1.8.0_45\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\jfxswt.jar;C:\Program
Files\Java\jdk1.8.0_45\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\rt.jar;C:\Program
Files\Java\jdk1.8.0_45\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\jfxrt.jar;C:\Program
Files\Java\jdk1.8.0_45\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\sunmscapi.jar;C:\Program
Files\Java\jdk1.8.0_45\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\zipfs.jar;D:\programFiles\IntelliJIDEA\WordCount\out\production\WordCount;C:\Program Files (x86)\scala\lib\scala-actors-migration.jar;C:\Program Files (x86)\scala\lib\scala-actors.jar;C:\Program
Files (x86)\scala\lib\scala-library.jar;C:\Program Files (x86)\scala\lib\scala-reflect.jar;C:\Program Files (x86)\scala\lib\scala-swing.jar;D:\programFiles\spark-1.6.0-bin-hadoop2.6\lib\spark-assembly-1.6.0-hadoop2.6.0.jar;D:\programFiles\IntelliJIDEA\IntelliJ
IDEA Community Edition 14.1.4\lib\idea_rt.jar" com.intellij.rt.execution.application.AppMain com.dt.spark.WordCount
Using Spark's default log4j profile: org/apache/spark/log4j-defaults.properties
16/01/31 17:31:19 INFO SparkContext: Running Spark version 1.6.0
16/01/31 17:31:26 INFO SecurityManager: Changing view acls to: think
16/01/31 17:31:26 INFO SecurityManager: Changing modify acls to: think
16/01/31 17:31:26 INFO SecurityManager: SecurityManager: authentication disabled; ui acls disabled; users with view permissions: Set(think); users with modify permissions: Set(think)
16/01/31 17:31:30 INFO Utils: Successfully started service 'sparkDriver' on port 65482.
16/01/31 17:31:32 INFO Slf4jLogger: Slf4jLogger started
16/01/31 17:31:32 INFO Remoting: Starting remoting
16/01/31 17:31:33 INFO Remoting: Remoting started; listening on addresses :[akka.tcp://sparkDriverActorSystem@192.168.56.1:65495]
16/01/31 17:31:33 INFO Utils: Successfully started service 'sparkDriverActorSystem' on port 65495.
16/01/31 17:31:33 INFO SparkEnv: Registering MapOutputTracker
16/01/31 17:31:33 INFO SparkEnv: Registering BlockManagerMaster
16/01/31 17:31:33 INFO DiskBlockManager: Created local directory at C:\Users\think\AppData\Local\Temp\blockmgr-d9a024a6-c4da-49e7-baca-d10b53f39e88
16/01/31 17:31:34 INFO MemoryStore: MemoryStore started with capacity 1091.3 MB
16/01/31 17:31:34 INFO SparkEnv: Registering OutputCommitCoordinator
16/01/31 17:31:35 INFO Utils: Successfully started service 'SparkUI' on port 4040.
16/01/31 17:31:35 INFO SparkUI: Started SparkUI at http://192.168.56.1:4040
16/01/31 17:31:36 INFO Executor: Starting executor ID driver on host localhost
16/01/31 17:31:36 INFO Utils: Successfully started service 'org.apache.spark.network.netty.NettyBlockTransferService' on port 65502.
16/01/31 17:31:36 INFO NettyBlockTransferService: Server created on 65502
16/01/31 17:31:36 INFO BlockManagerMaster: Trying to register BlockManager
16/01/31 17:31:36 INFO BlockManagerMasterEndpoint: Registering block manager localhost:65502 with 1091.3 MB RAM, BlockManagerId(driver, localhost, 65502)
16/01/31 17:31:36 INFO BlockManagerMaster: Registered BlockManager
16/01/31 17:31:40 INFO MemoryStore: Block broadcast_0 stored as values in memory (estimated size 127.4 KB, free 127.4 KB)
16/01/31 17:31:41 INFO MemoryStore: Block broadcast_0_piece0 stored as bytes in memory (estimated size 13.9 KB, free 141.3 KB)
16/01/31 17:31:41 INFO BlockManagerInfo: Added broadcast_0_piece0 in memory on localhost:65502 (size: 13.9 KB, free: 1091.2 MB)
16/01/31 17:31:41 INFO SparkContext: Created broadcast 0 from textFile at WordCount.scala:11
16/01/31 17:31:43 WARN : Your hostname, think-PC resolves to a loopback/non-reachable address: fe80:0:0:0:d401:a5b5:2103:6d13%eth11, but we couldn't find any external IP address!
16/01/31 17:31:44 INFO FileInputFormat: Total input paths to process : 1
16/01/31 17:31:44 INFO SparkContext: Starting job: foreach at WordCount.scala:15
16/01/31 17:31:44 INFO DAGScheduler: Registering RDD 3 (map at WordCount.scala:13)
16/01/31 17:31:44 INFO DAGScheduler: Got job 0 (foreach at WordCount.scala:15) with 1 output partitions
16/01/31 17:31:44 INFO DAGScheduler: Final stage: ResultStage 1 (foreach at WordCount.scala:15)
16/01/31 17:31:44 INFO DAGScheduler: Parents of final stage: List(ShuffleMapStage 0)
16/01/31 17:31:44 INFO DAGScheduler: Missing parents: List(ShuffleMapStage 0)
16/01/31 17:31:44 INFO DAGScheduler: Submitting ShuffleMapStage 0 (MapPartitionsRDD[3] at map at WordCount.scala:13), which has no missing parents
16/01/31 17:31:45 INFO MemoryStore: Block broadcast_1 stored as values in memory (estimated size 4.1 KB, free 145.4 KB)
16/01/31 17:31:45 INFO MemoryStore: Block broadcast_1_piece0 stored as bytes in memory (estimated size 2.3 KB, free 147.7 KB)
16/01/31 17:31:45 INFO BlockManagerInfo: Added broadcast_1_piece0 in memory on localhost:65502 (size: 2.3 KB, free: 1091.2 MB)
16/01/31 17:31:45 INFO SparkContext: Created broadcast 1 from broadcast at DAGScheduler.scala:1006
16/01/31 17:31:45 INFO DAGScheduler: Submitting 1 missing tasks from ShuffleMapStage 0 (MapPartitionsRDD[3] at map at WordCount.scala:13)
16/01/31 17:31:45 INFO TaskSchedulerImpl: Adding task set 0.0 with 1 tasks
16/01/31 17:31:45 INFO TaskSetManager: Starting task 0.0 in stage 0.0 (TID 0, localhost, partition 0,PROCESS_LOCAL, 2148 bytes)
16/01/31 17:31:45 INFO Executor: Running task 0.0 in stage 0.0 (TID 0)
16/01/31 17:31:45 INFO HadoopRDD: Input split: file:/D:/programFiles/spark-1.6.0-bin-hadoop2.6/README.md:0+3359
16/01/31 17:31:45 INFO deprecation: mapred.tip.id is deprecated. Instead, use mapreduce.task.id
16/01/31 17:31:45 INFO deprecation: mapred.task.id is deprecated. Instead, use mapreduce.task.attempt.id
16/01/31 17:31:45 INFO deprecation: mapred.task.is.map is deprecated. Instead, use mapreduce.task.ismap
16/01/31 17:31:45 INFO deprecation: mapred.task.partition is deprecated. Instead, use mapreduce.task.partition
16/01/31 17:31:45 INFO deprecation: mapred.job.id is deprecated. Instead, use mapreduce.job.id
16/01/31 17:31:47 INFO Executor: Finished task 0.0 in stage 0.0 (TID 0). 2253 bytes result sent to driver
16/01/31 17:31:47 INFO TaskSetManager: Finished task 0.0 in stage 0.0 (TID 0) in 1593 ms on localhost (1/1)
16/01/31 17:31:47 INFO DAGScheduler: ShuffleMapStage 0 (map at WordCount.scala:13) finished in 1.733 s
16/01/31 17:31:47 INFO DAGScheduler: looking for newly runnable stages
16/01/31 17:31:47 INFO DAGScheduler: running: Set()
16/01/31 17:31:47 INFO TaskSchedulerImpl: Removed TaskSet 0.0, whose tasks have all completed, from pool
16/01/31 17:31:47 INFO DAGScheduler: waiting: Set(ResultStage 1)
16/01/31 17:31:47 INFO DAGScheduler: failed: Set()
16/01/31 17:31:47 INFO DAGScheduler: Submitting ResultStage 1 (ShuffledRDD[4] at reduceByKey at WordCount.scala:14), which has no missing parents
16/01/31 17:31:47 INFO MemoryStore: Block broadcast_2 stored as values in memory (estimated size 2.5 KB, free 150.2 KB)
16/01/31 17:31:47 INFO MemoryStore: Block broadcast_2_piece0 stored as bytes in memory (estimated size 1581.0 B, free 151.7 KB)
16/01/31 17:31:47 INFO BlockManagerInfo: Added broadcast_2_piece0 in memory on localhost:65502 (size: 1581.0 B, free: 1091.2 MB)
16/01/31 17:31:47 INFO SparkContext: Created broadcast 2 from broadcast at DAGScheduler.scala:1006
16/01/31 17:31:47 INFO DAGScheduler: Submitting 1 missing tasks from ResultStage 1 (ShuffledRDD[4] at reduceByKey at WordCount.scala:14)
16/01/31 17:31:47 INFO TaskSchedulerImpl: Adding task set 1.0 with 1 tasks
16/01/31 17:31:47 INFO TaskSetManager: Starting task 0.0 in stage 1.0 (TID 1, localhost, partition 0,NODE_LOCAL, 1894 bytes)
16/01/31 17:31:47 INFO Executor: Running task 0.0 in stage 1.0 (TID 1)
16/01/31 17:31:47 INFO ShuffleBlockFetcherIterator: Getting 1 non-empty blocks out of 1 blocks
16/01/31 17:31:47 INFO ShuffleBlockFetcherIterator: Started 0 remote fetches in 25 ms
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16/01/31 17:31:47 INFO Executor: Finished task 0.0 in stage 1.0 (TID 1). 1165 bytes result sent to driver
16/01/31 17:31:47 INFO DAGScheduler: ResultStage 1 (foreach at WordCount.scala:15) finished in 0.597 s
16/01/31 17:31:47 INFO TaskSetManager: Finished task 0.0 in stage 1.0 (TID 1) in 596 ms on localhost (1/1)
16/01/31 17:31:47 INFO TaskSchedulerImpl: Removed TaskSet 1.0, whose tasks have all completed, from pool
16/01/31 17:31:48 INFO DAGScheduler: Job 0 finished: foreach at WordCount.scala:15, took 3.411606 s
16/01/31 17:31:48 INFO SparkUI: Stopped Spark web UI at http://192.168.56.1:4040
16/01/31 17:31:48 INFO MapOutputTrackerMasterEndpoint: MapOutputTrackerMasterEndpoint stopped!
16/01/31 17:31:48 INFO MemoryStore: MemoryStore cleared
16/01/31 17:31:48 INFO BlockManager: BlockManager stopped
16/01/31 17:31:48 INFO BlockManagerMaster: BlockManagerMaster stopped
16/01/31 17:31:48 INFO OutputCommitCoordinator$OutputCommitCoordinatorEndpoint: OutputCommitCoordinator stopped!
16/01/31 17:31:48 INFO SparkContext: Successfully stopped SparkContext
16/01/31 17:31:48 INFO RemoteActorRefProvider$RemotingTerminator: Shutting down remote daemon.
16/01/31 17:31:48 INFO ShutdownHookManager: Shutdown hook called
16/01/31 17:31:48 INFO ShutdownHookManager: Deleting directory C:\Users\think\AppData\Local\Temp\spark-40913b6e-9c2a-4356-85e6-f021141cf06f
16/01/31 17:31:48 INFO RemoteActorRefProvider$RemotingTerminator: Remote daemon shut down; proceeding with flushing remote transports.
Process finished with exit code 0
成功运行在local 模式。
下面将WordCount运行于集群模式：
代码如下：
package com.dt.spark
import org.apache.spark.SparkConf
import org.apache.spark.SparkContext
/**
* 使用scala开发集群运行的spark WordCount程序
* DT大数据梦工厂
* 新浪微博：http://weibo.com/ilovepains/
*/
object WordCountCluster {
def main(args: Array[String]){
/*
* 第一步：创建spark的配置对象SparkConf，设置Spark程序运行时的配置信息
* 例如通过setMaster来设置程序要链接的Spark集群的Master的URL，如果设置
* 为local，则代表Spark程序在本地运行，特别适合于机器配置条件非常差（例如
* 只有1内存）的初学者
*/
val conf = new SparkConf() //创建SparkConf对象。因为是全局唯一的，所以使用new，不用工厂方法模式。
conf.setAppName("Wow, My First Spark App!") //设置应用程序的名称，在程序运行的监控界面可以看到名称
// conf.setMaster("local") //此时程序在Spark集群。
/**
* 第二步：创建SparkContext对象，
* SparkContext是Spark程序所有功能的唯一入口，无论是采用scala/java/Python/R等都必须有一个SParkContext，而且默认都只有一个。
* SparkContext核心作用：初始化应用程序运行时所需要的核心组件，包括DAGScheduler,TaskScheduler,Scheduler Backend,
* 同时还会负责Spark程序往Master注册程序等。SparkContext是整个Spark应用程序中最为重要的一个对象，
*
*/
val sc = new SparkContext(conf) //通过创建SparkContext对象，通过传入SparkConf实例来定制SPark地的具体参数和配置信息。
/*
* 第三步：根据具体的数据来源（/HBase/Local FS/DB/S3等）通过SparkContext创建RDD，
* RDD创建有三种基本方式：1.根据外部数据来源（如HDFS），2.根据Scala集合，3.由其他RDD操作产生
* 数据会被RDD划分成为一系列的Partitions，分配到每个Partition的数据属于一个Task的处理范畴，
*/
val lines = sc.textFile("hdfs://192.168.1.121:9000/user/spark/README.md") //读取HDFS文件，并切分成不同的partitions
//也可以写成：l lines:RDD[String] = sc.textFile 类型推断
/**
* 第4步：对初始RDD进行Transformation级别的处理。例如map/filter等高阶函数等的编程
* 来进行具体的数据计算。第4.1步：将每一行的字符串拆分成单个的单词。
*/
val words = lines.flatMap { line => line.split(" ") } //对每一行的字符串进行单词拆分，map每次循环一行，将每一行的小集合通过flat合并成一个大集合
/**
* 第4.2步，在单词拆分的基础上对每个单词实例 进行计数为1，也就是word => (word,1)
*/
val pairs = words.map { word => (word,1) }
/**
* 第4.3步，在每个单词实例计数为1的基础上，统计每个单词在文件中出现的总次数。
*/
val wordCountsOrdered = pairs.reduceByKey(_+_).map(pair => (pair._2,pair._1)).sortByKey(false).map(pair => (pair._2,pair._1))
//对相同的Key,进行Value的累计（包括Local和Reduce级别同时 Reduce）
wordCounts.collect.foreach(wordNumberPair => println(wordNumberPair._1 + " : " + wordNumberPair._2))
sc.stop() //把上下文去掉，释放资源
}
}
在IDE中不推荐直接发布到集群，原因是
1.内存和cores的限制，默认情况下spark程序的driver是在提交spark程序的机器上，如果在IDE中提交程序，那么IDE机器就必须非常强大。
2. driver要指挥集群中的workers的运行，并频繁发生通信，如果开发环境IDE和spark集群不在同一个下，就会出现任务丢失造成运行缓慢等多种不必要的问题。
3. 这是不安全的。
远程调试也需要driver和集群在同一个网络环境中。
一般在生产环境下，都需要专门的和worker配置相同且在同样的网络环境的机器作为driver。
在IDEA中打包程序。
点击File->project Structure->Atrifacts，手动打包。点击+号，后选择JAR->From modules with dependencies...
选择Main Class为com.dt.spark.WordCountCluster后点击OK。
去掉Name中的WordCount:jar中的:jar，选择Output Directory。
特别注意：一定要把scala和spark的包去掉（通过点击-号）。原因是：
1. 包会特别大
2. 实际运行时如果没有这些jar，程序会自动到系统中去找。
选择IDEA主菜单的Build->Build Artifacts->WordCount->Build，开始打包。
打包成功后将jar包拷贝到集群中通过下面命令提交集群运行。
sprak-submit --class com.dt.spark.WordCountCluster --master spark://slq1:7077 /home/richard/spark-1.6.0/class/WordCount.jar
***实际生产环境下都是将命令写成shell脚本来运行，不需要每次都写很长的命令。
以上内容是王家林老师DT大数据梦工厂《 IMF传奇行动》第9课的学习笔记。
王家林：Spark、Flink、Docker、Android技术中国区布道师。Spark亚太研究院院长和首席专家，DT大数据梦工厂创始人，Android软硬整合源码级专家，英语发音魔术师，健身狂热爱好者。
微信公众账号：DT_Spark
联系邮箱18610086859@126.com
电话：18610086859
QQ:1740415547
微信号：18610086859
新浪微博：ilovepains
1.下载IntelliJ IDEA:
http://www.jetbrains.com/idea/
选择社区版，要在centos上安装，需要下载.TARGZ，解压。
进入IDEA目录下的bin目录下，./idea.sh启动（需要提前安装好java，并设定好JAVA_HOME）
windows下需要下载.exe文件后双击安装。
安装时会出现下图所示界面时点击Install scala。安装完成后如下图：
点击File->new Project->scala->scala->next，如下图：
选择scala SDK为scala-sdk-2.10.4后点击finish。
5.File－> Project Structure来设置工程的libraries,核心是添加spark的jar。
选择Libraries后点击+号后选择java。选择java是从jvm的角度考虑的。
6.添加spark的jar依赖，选择解压后的spark-1.6.0-bin-hadoop2.6.0目录中的lib/spark-assembly-1.6.0-hadoop2.6.0.jar
导入完成后选择Modules为WordCount后点击OK。
可以看到java和scala、spark的依赖都被加入到WordCount项目中了。
7. 在WordCount项目中的src上点击右键，选择new->package，包名为com.dt.spark。在包名上点击右键，选择new->scala class，选择Kind为object，填写Name为WordCount。
8. 编写代码如下：
package com.dt.spark
import org.apache.spark.SparkConf
import org.apache.spark.SparkContext
/**
* 使用scala开发本地测试的spark WordCount程序
* DT大数据梦工厂
* 新浪微博：p://weibo.com/ilovepains/
*/
object WordCount {
def main(args: Array[String]){
/*
* 第一步：创建spark的配置对象SparkConf，设置Spark程序运行时的配置信息
* 例如通过setMaster来设置程序要链接的Spark集群的Master的URL，如果设置
* 为local，则代表Spark程序在本地运行，特别适合于机器配置条件非常差（例如
* 只有1内存）的初学者
*/
val conf = new SparkConf() //创建SparkConf对象。因为是全局唯一的，所以使用new，不用工厂方法模式。
conf.setAppName("Wow, My First Spark App!") //设置应用程序的名称，在程序运行的监控界面可以看到名称
conf.setMaster("local") //此时程序在本地运行，不需要安装spark集群。
/**
* 第二步：创建SparkContext对象，
* SparkContext是Spark程序所有功能的唯一入口，无论是采用scala/java/Python/R等都必须有一个SParkContext，而且默认都只有一个。
* SparkContext核心作用：初始化应用程序运行时所需要的核心组件，包括DAGScheduler,TaskScheduler,Scheduler Backend,
* 同时还会负责Spark程序往Master注册程序等。SparkContext是整个Spark应用程序中最为重要的一个对象，
*
*/
val sc = new SparkContext(conf) //通过创建SparkContext对象，通过传入SparkConf实例来定制SPark地的具体参数和配置信息。
/*
* 第三步：根据具体的数据来源（/HBase/Local FS/DB/S3等）通过SparkContext创建RDD，
* RDD创建有三种基本方式：1.根据外部数据来源（如HDFS），2.根据Scala集合，3.由其他RDD操作产生
* 数据会被RDD划分成为一系列的Partitions，分配到每个Partition的数据属于一个Task的处理范畴，
*/
val lines = sc.textFile("D://programFiles//spark-1.6.0-bin-hadoop2.6//README.md", 1) //假设电脑只有1G内存，一个core。读取本地文件，设置partition
//也可以写成：l lines:RDD[String] = sc.textFile 类型推断
/**
* 第4步：对初始RDD进行Transformation级别的处理。例如map/filter等高阶函数等的编程
* 来进行具体的数据计算。第4.1步：将每一行的字符串拆分成单个的单词。
*/
val words = lines.flatMap { line => line.split(" ") } //对每一行的字符串进行单词拆分，map每次循环一行，将每一行的小集合通过flat合并成一个大集合
/**
* 第4.2步，在单词拆分的基础上对每个单词实例 进行计数为1，也就是word => (word,1)
*/
val pairs = words.map { word => (word,1) }
/**
* 第4.3步，在每个单词实例计数为1的基础上，统计每个单词在文件中出现的总次数。
*/
val wordCounts = pairs.reduceByKey(_+_) //对相同的Key,进行Value的累计（包括Local和Reduce级别同时 Reduce）
wordCounts.foreach(wordNumberPair => println(wordNumberPair._1 + " : " + wordNumberPair._2))
sc.stop() //把上下文去掉，释放资源
}
}
运行时的console结果：
"C:\Program Files\Java\jdk1.8.0_45\bin\java" -Didea.launcher.port=7532 "-Didea.launcher.bin.path=D:\programFiles\IntelliJIDEA\IntelliJ IDEA Community Edition 14.1.4\bin" -Dfile.encoding=GBK -classpath "C:\Program Files\Java\jdk1.8.0_45\jre\lib\charsets.jar;C:\Program
Files\Java\jdk1.8.0_45\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\jfxswt.jar;C:\Program
Files\Java\jdk1.8.0_45\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\rt.jar;C:\Program
Files\Java\jdk1.8.0_45\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\jfxrt.jar;C:\Program
Files\Java\jdk1.8.0_45\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\sunmscapi.jar;C:\Program
Files\Java\jdk1.8.0_45\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\zipfs.jar;D:\programFiles\IntelliJIDEA\WordCount\out\production\WordCount;C:\Program Files (x86)\scala\lib\scala-actors-migration.jar;C:\Program Files (x86)\scala\lib\scala-actors.jar;C:\Program
Files (x86)\scala\lib\scala-library.jar;C:\Program Files (x86)\scala\lib\scala-reflect.jar;C:\Program Files (x86)\scala\lib\scala-swing.jar;D:\programFiles\spark-1.6.0-bin-hadoop2.6\lib\spark-assembly-1.6.0-hadoop2.6.0.jar;D:\programFiles\IntelliJIDEA\IntelliJ
IDEA Community Edition 14.1.4\lib\idea_rt.jar" com.intellij.rt.execution.application.AppMain com.dt.spark.WordCount
Using Spark's default log4j profile: org/apache/spark/log4j-defaults.properties
16/01/31 17:31:19 INFO SparkContext: Running Spark version 1.6.0
16/01/31 17:31:26 INFO SecurityManager: Changing view acls to: think
16/01/31 17:31:26 INFO SecurityManager: Changing modify acls to: think
16/01/31 17:31:26 INFO SecurityManager: SecurityManager: authentication disabled; ui acls disabled; users with view permissions: Set(think); users with modify permissions: Set(think)
16/01/31 17:31:30 INFO Utils: Successfully started service 'sparkDriver' on port 65482.
16/01/31 17:31:32 INFO Slf4jLogger: Slf4jLogger started
16/01/31 17:31:32 INFO Remoting: Starting remoting
16/01/31 17:31:33 INFO Remoting: Remoting started; listening on addresses :[akka.tcp://sparkDriverActorSystem@192.168.56.1:65495]
16/01/31 17:31:33 INFO Utils: Successfully started service 'sparkDriverActorSystem' on port 65495.
16/01/31 17:31:33 INFO SparkEnv: Registering MapOutputTracker
16/01/31 17:31:33 INFO SparkEnv: Registering BlockManagerMaster
16/01/31 17:31:33 INFO DiskBlockManager: Created local directory at C:\Users\think\AppData\Local\Temp\blockmgr-d9a024a6-c4da-49e7-baca-d10b53f39e88
16/01/31 17:31:34 INFO MemoryStore: MemoryStore started with capacity 1091.3 MB
16/01/31 17:31:34 INFO SparkEnv: Registering OutputCommitCoordinator
16/01/31 17:31:35 INFO Utils: Successfully started service 'SparkUI' on port 4040.
16/01/31 17:31:35 INFO SparkUI: Started SparkUI at http://192.168.56.1:4040
16/01/31 17:31:36 INFO Executor: Starting executor ID driver on host localhost
16/01/31 17:31:36 INFO Utils: Successfully started service 'org.apache.spark.network.netty.NettyBlockTransferService' on port 65502.
16/01/31 17:31:36 INFO NettyBlockTransferService: Server created on 65502
16/01/31 17:31:36 INFO BlockManagerMaster: Trying to register BlockManager
16/01/31 17:31:36 INFO BlockManagerMasterEndpoint: Registering block manager localhost:65502 with 1091.3 MB RAM, BlockManagerId(driver, localhost, 65502)
16/01/31 17:31:36 INFO BlockManagerMaster: Registered BlockManager
16/01/31 17:31:40 INFO MemoryStore: Block broadcast_0 stored as values in memory (estimated size 127.4 KB, free 127.4 KB)
16/01/31 17:31:41 INFO MemoryStore: Block broadcast_0_piece0 stored as bytes in memory (estimated size 13.9 KB, free 141.3 KB)
16/01/31 17:31:41 INFO BlockManagerInfo: Added broadcast_0_piece0 in memory on localhost:65502 (size: 13.9 KB, free: 1091.2 MB)
16/01/31 17:31:41 INFO SparkContext: Created broadcast 0 from textFile at WordCount.scala:11
16/01/31 17:31:43 WARN : Your hostname, think-PC resolves to a loopback/non-reachable address: fe80:0:0:0:d401:a5b5:2103:6d13%eth11, but we couldn't find any external IP address!
16/01/31 17:31:44 INFO FileInputFormat: Total input paths to process : 1
16/01/31 17:31:44 INFO SparkContext: Starting job: foreach at WordCount.scala:15
16/01/31 17:31:44 INFO DAGScheduler: Registering RDD 3 (map at WordCount.scala:13)
16/01/31 17:31:44 INFO DAGScheduler: Got job 0 (foreach at WordCount.scala:15) with 1 output partitions
16/01/31 17:31:44 INFO DAGScheduler: Final stage: ResultStage 1 (foreach at WordCount.scala:15)
16/01/31 17:31:44 INFO DAGScheduler: Parents of final stage: List(ShuffleMapStage 0)
16/01/31 17:31:44 INFO DAGScheduler: Missing parents: List(ShuffleMapStage 0)
16/01/31 17:31:44 INFO DAGScheduler: Submitting ShuffleMapStage 0 (MapPartitionsRDD[3] at map at WordCount.scala:13), which has no missing parents
16/01/31 17:31:45 INFO MemoryStore: Block broadcast_1 stored as values in memory (estimated size 4.1 KB, free 145.4 KB)
16/01/31 17:31:45 INFO MemoryStore: Block broadcast_1_piece0 stored as bytes in memory (estimated size 2.3 KB, free 147.7 KB)
16/01/31 17:31:45 INFO BlockManagerInfo: Added broadcast_1_piece0 in memory on localhost:65502 (size: 2.3 KB, free: 1091.2 MB)
16/01/31 17:31:45 INFO SparkContext: Created broadcast 1 from broadcast at DAGScheduler.scala:1006
16/01/31 17:31:45 INFO DAGScheduler: Submitting 1 missing tasks from ShuffleMapStage 0 (MapPartitionsRDD[3] at map at WordCount.scala:13)
16/01/31 17:31:45 INFO TaskSchedulerImpl: Adding task set 0.0 with 1 tasks
16/01/31 17:31:45 INFO TaskSetManager: Starting task 0.0 in stage 0.0 (TID 0, localhost, partition 0,PROCESS_LOCAL, 2148 bytes)
16/01/31 17:31:45 INFO Executor: Running task 0.0 in stage 0.0 (TID 0)
16/01/31 17:31:45 INFO HadoopRDD: Input split: file:/D:/programFiles/spark-1.6.0-bin-hadoop2.6/README.md:0+3359
16/01/31 17:31:45 INFO deprecation: mapred.tip.id is deprecated. Instead, use mapreduce.task.id
16/01/31 17:31:45 INFO deprecation: mapred.task.id is deprecated. Instead, use mapreduce.task.attempt.id
16/01/31 17:31:45 INFO deprecation: mapred.task.is.map is deprecated. Instead, use mapreduce.task.ismap
16/01/31 17:31:45 INFO deprecation: mapred.task.partition is deprecated. Instead, use mapreduce.task.partition
16/01/31 17:31:45 INFO deprecation: mapred.job.id is deprecated. Instead, use mapreduce.job.id
16/01/31 17:31:47 INFO Executor: Finished task 0.0 in stage 0.0 (TID 0). 2253 bytes result sent to driver
16/01/31 17:31:47 INFO TaskSetManager: Finished task 0.0 in stage 0.0 (TID 0) in 1593 ms on localhost (1/1)
16/01/31 17:31:47 INFO DAGScheduler: ShuffleMapStage 0 (map at WordCount.scala:13) finished in 1.733 s
16/01/31 17:31:47 INFO DAGScheduler: looking for newly runnable stages
16/01/31 17:31:47 INFO DAGScheduler: running: Set()
16/01/31 17:31:47 INFO TaskSchedulerImpl: Removed TaskSet 0.0, whose tasks have all completed, from pool
16/01/31 17:31:47 INFO DAGScheduler: waiting: Set(ResultStage 1)
16/01/31 17:31:47 INFO DAGScheduler: failed: Set()
16/01/31 17:31:47 INFO DAGScheduler: Submitting ResultStage 1 (ShuffledRDD[4] at reduceByKey at WordCount.scala:14), which has no missing parents
16/01/31 17:31:47 INFO MemoryStore: Block broadcast_2 stored as values in memory (estimated size 2.5 KB, free 150.2 KB)
16/01/31 17:31:47 INFO MemoryStore: Block broadcast_2_piece0 stored as bytes in memory (estimated size 1581.0 B, free 151.7 KB)
16/01/31 17:31:47 INFO BlockManagerInfo: Added broadcast_2_piece0 in memory on localhost:65502 (size: 1581.0 B, free: 1091.2 MB)
16/01/31 17:31:47 INFO SparkContext: Created broadcast 2 from broadcast at DAGScheduler.scala:1006
16/01/31 17:31:47 INFO DAGScheduler: Submitting 1 missing tasks from ResultStage 1 (ShuffledRDD[4] at reduceByKey at WordCount.scala:14)
16/01/31 17:31:47 INFO TaskSchedulerImpl: Adding task set 1.0 with 1 tasks
16/01/31 17:31:47 INFO TaskSetManager: Starting task 0.0 in stage 1.0 (TID 1, localhost, partition 0,NODE_LOCAL, 1894 bytes)
16/01/31 17:31:47 INFO Executor: Running task 0.0 in stage 1.0 (TID 1)
16/01/31 17:31:47 INFO ShuffleBlockFetcherIterator: Getting 1 non-empty blocks out of 1 blocks
16/01/31 17:31:47 INFO ShuffleBlockFetcherIterator: Started 0 remote fetches in 25 ms
package : 1
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sample : 1
16/01/31 17:31:47 INFO Executor: Finished task 0.0 in stage 1.0 (TID 1). 1165 bytes result sent to driver
16/01/31 17:31:47 INFO DAGScheduler: ResultStage 1 (foreach at WordCount.scala:15) finished in 0.597 s
16/01/31 17:31:47 INFO TaskSetManager: Finished task 0.0 in stage 1.0 (TID 1) in 596 ms on localhost (1/1)
16/01/31 17:31:47 INFO TaskSchedulerImpl: Removed TaskSet 1.0, whose tasks have all completed, from pool
16/01/31 17:31:48 INFO DAGScheduler: Job 0 finished: foreach at WordCount.scala:15, took 3.411606 s
16/01/31 17:31:48 INFO SparkUI: Stopped Spark web UI at http://192.168.56.1:4040
16/01/31 17:31:48 INFO MapOutputTrackerMasterEndpoint: MapOutputTrackerMasterEndpoint stopped!
16/01/31 17:31:48 INFO MemoryStore: MemoryStore cleared
16/01/31 17:31:48 INFO BlockManager: BlockManager stopped
16/01/31 17:31:48 INFO BlockManagerMaster: BlockManagerMaster stopped
16/01/31 17:31:48 INFO OutputCommitCoordinator$OutputCommitCoordinatorEndpoint: OutputCommitCoordinator stopped!
16/01/31 17:31:48 INFO SparkContext: Successfully stopped SparkContext
16/01/31 17:31:48 INFO RemoteActorRefProvider$RemotingTerminator: Shutting down remote daemon.
16/01/31 17:31:48 INFO ShutdownHookManager: Shutdown hook called
16/01/31 17:31:48 INFO ShutdownHookManager: Deleting directory C:\Users\think\AppData\Local\Temp\spark-40913b6e-9c2a-4356-85e6-f021141cf06f
16/01/31 17:31:48 INFO RemoteActorRefProvider$RemotingTerminator: Remote daemon shut down; proceeding with flushing remote transports.
Process finished with exit code 0
成功运行在local 模式。
下面将WordCount运行于集群模式：
代码如下：
package com.dt.spark
import org.apache.spark.SparkConf
import org.apache.spark.SparkContext
/**
* 使用scala开发集群运行的spark WordCount程序
* DT大数据梦工厂
* 新浪微博：http://weibo.com/ilovepains/
*/
object WordCountCluster {
def main(args: Array[String]){
/*
* 第一步：创建spark的配置对象SparkConf，设置Spark程序运行时的配置信息
* 例如通过setMaster来设置程序要链接的Spark集群的Master的URL，如果设置
* 为local，则代表Spark程序在本地运行，特别适合于机器配置条件非常差（例如
* 只有1内存）的初学者
*/
val conf = new SparkConf() //创建SparkConf对象。因为是全局唯一的，所以使用new，不用工厂方法模式。
conf.setAppName("Wow, My First Spark App!") //设置应用程序的名称，在程序运行的监控界面可以看到名称
// conf.setMaster("local") //此时程序在Spark集群。
/**
* 第二步：创建SparkContext对象，
* SparkContext是Spark程序所有功能的唯一入口，无论是采用scala/java/Python/R等都必须有一个SParkContext，而且默认都只有一个。
* SparkContext核心作用：初始化应用程序运行时所需要的核心组件，包括DAGScheduler,TaskScheduler,Scheduler Backend,
* 同时还会负责Spark程序往Master注册程序等。SparkContext是整个Spark应用程序中最为重要的一个对象，
*
*/
val sc = new SparkContext(conf) //通过创建SparkContext对象，通过传入SparkConf实例来定制SPark地的具体参数和配置信息。
/*
* 第三步：根据具体的数据来源（/HBase/Local FS/DB/S3等）通过SparkContext创建RDD，
* RDD创建有三种基本方式：1.根据外部数据来源（如HDFS），2.根据Scala集合，3.由其他RDD操作产生
* 数据会被RDD划分成为一系列的Partitions，分配到每个Partition的数据属于一个Task的处理范畴，
*/
val lines = sc.textFile("hdfs://192.168.1.121:9000/user/spark/README.md") //读取HDFS文件，并切分成不同的partitions
//也可以写成：l lines:RDD[String] = sc.textFile 类型推断
/**
* 第4步：对初始RDD进行Transformation级别的处理。例如map/filter等高阶函数等的编程
* 来进行具体的数据计算。第4.1步：将每一行的字符串拆分成单个的单词。
*/
val words = lines.flatMap { line => line.split(" ") } //对每一行的字符串进行单词拆分，map每次循环一行，将每一行的小集合通过flat合并成一个大集合
/**
* 第4.2步，在单词拆分的基础上对每个单词实例 进行计数为1，也就是word => (word,1)
*/
val pairs = words.map { word => (word,1) }
/**
* 第4.3步，在每个单词实例计数为1的基础上，统计每个单词在文件中出现的总次数。
*/
val wordCountsOrdered = pairs.reduceByKey(_+_).map(pair => (pair._2,pair._1)).sortByKey(false).map(pair => (pair._2,pair._1))
//对相同的Key,进行Value的累计（包括Local和Reduce级别同时 Reduce）
wordCounts.collect.foreach(wordNumberPair => println(wordNumberPair._1 + " : " + wordNumberPair._2))
sc.stop() //把上下文去掉，释放资源
}
}
在IDE中不推荐直接发布到集群，原因是
1.内存和cores的限制，默认情况下spark程序的driver是在提交spark程序的机器上，如果在IDE中提交程序，那么IDE机器就必须非常强大。
2. driver要指挥集群中的workers的运行，并频繁发生通信，如果开发环境IDE和spark集群不在同一个下，就会出现任务丢失造成运行缓慢等多种不必要的问题。
3. 这是不安全的。
远程调试也需要driver和集群在同一个网络环境中。
一般在生产环境下，都需要专门的和worker配置相同且在同样的网络环境的机器作为driver。
在IDEA中打包程序。
点击File->project Structure->Atrifacts，手动打包。点击+号，后选择JAR->From modules with dependencies...
选择Main Class为com.dt.spark.WordCountCluster后点击OK。
去掉Name中的WordCount:jar中的:jar，选择Output Directory。
特别注意：一定要把scala和spark的包去掉（通过点击-号）。原因是：
1. 包会特别大
2. 实际运行时如果没有这些jar，程序会自动到系统中去找。
选择IDEA主菜单的Build->Build Artifacts->WordCount->Build，开始打包。
打包成功后将jar包拷贝到集群中通过下面命令提交集群运行。
sprak-submit --class com.dt.spark.WordCountCluster --master spark://slq1:7077 /home/richard/spark-1.6.0/class/WordCount.jar
***实际生产环境下都是将命令写成shell脚本来运行，不需要每次都写很长的命令。
以上内容是王家林老师DT大数据梦工厂《 IMF传奇行动》第9课的学习笔记。
王家林：Spark、Flink、Docker、Android技术中国区布道师。Spark亚太研究院院长和首席专家，DT大数据梦工厂创始人，Android软硬整合源码级专家，英语发音魔术师，健身狂热爱好者。
微信公众账号：DT_Spark
联系邮箱18610086859@126.com
电话：18610086859
QQ:1740415547
微信号：18610086859
新浪微博：ilovepains
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