wordcount程序

文件wordcount.txt

hello wujiadong
hello spark
hello hadoop
hello python

程序示例

package wujiadong_sparkCoreimport org.apache.spark.{SparkConf, SparkContext}/*** Created by Administrator on 2017/2/25.*/
object LocalSpark {def main(args: Array[String]): Unit = {//第一步：创建SparkConf对象，设置spark应用的配置信息//使用setMaster()可以设置spark应用程序要连接spark集群的master节点的url//设置为local则代表在本地运行val conf = new SparkConf().setAppName("localspark").setMaster("local")//在idea里运行的话才需要设置setMaster//创建SparkContext对象，SparkContex是spark所有功能的一个入口，主要作用包括初始化spark应用程序所需的一些核心组件，包括调度器//（DAGSchedule、TaskScheduler）还会去spark master节点上进行注册等等val sc = new SparkContext(conf)//本地文件val file = "C://Users//Administrator.USER-20160219OS//Desktop//wordcount.txt"//针对输入源（hdfs文件，本地文件等），创建一个初始的RDD,RDD中有元素这种概念，每一个元素就相当于文件的一行val lines = sc.textFile(file)//对初始RDD进行transformation操作//先将每一行拆分成一个一个的单词val wordRDD = lines.flatMap(line => line.split(" "))//将每个单词映射成(单词，1)这样的格式，后面才能根据单词作为key，来进行每个单词的出现次数的累加val wordpair = wordRDD.map(word => (word,1))//以单词作为key，统计每个单词出现的次数(对每个单词的key进行reduce操作)val result = wordpair.reduceByKey(_+_)//最后进行action操作，比如可以使用foreach进行触发result.foreach(wordNumberPair => println(wordNumberPair._1 + " , " + wordNumberPair._2))}}

运行结果

"C:\Program Files\Java\jdk1.8.0_101\bin\java" -Dspark.master=local -Didea.launcher.port=7532 "-Didea.launcher.bin.path=C:\Program Files (x86)\JetBrains\IntelliJ IDEA Community Edition 2016.3.3\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_101\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_101\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_101\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_101\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_101\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_101\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_101\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_101\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_101\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_101\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_101\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_101\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_101\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_101\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_101\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_101\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_101\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_101\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_101\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_101\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_101\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_101\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_101\jre\lib\rt.jar;D:\wujiadong.spark\out\production\wujiadong.spark;C:\Program Files (x86)\scala\lib\scala-library.jar;C:\Program Files (x86)\scala\lib\scala-reflect.jar;F:\spark-assembly-1.5.1-hadoop2.6.0.jar;C:\Program Files (x86)\JetBrains\IntelliJ IDEA Community Edition 2016.3.3\lib\idea_rt.jar" com.intellij.rt.execution.application.AppMain wujiadong_sparkCore.LocalSpark
Using Spark's default log4j profile: org/apache/spark/log4j-defaults.properties
17/03/04 20:41:21 INFO SparkContext: Running Spark version 1.5.1
17/03/04 20:41:24 WARN NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
17/03/04 20:41:24 INFO SecurityManager: Changing view acls to: Administrator
17/03/04 20:41:24 INFO SecurityManager: Changing modify acls to: Administrator
17/03/04 20:41:24 INFO SecurityManager: SecurityManager: authentication disabled; ui acls disabled; users with view permissions: Set(Administrator); users with modify permissions: Set(Administrator)
17/03/04 20:41:27 INFO Slf4jLogger: Slf4jLogger started
17/03/04 20:41:27 INFO Remoting: Starting remoting
17/03/04 20:41:28 INFO Remoting: Remoting started; listening on addresses :[akka.tcp://sparkDriver@10.11.25.3:64151]
17/03/04 20:41:29 INFO Utils: Successfully started service 'sparkDriver' on port 64151.
17/03/04 20:41:29 INFO SparkEnv: Registering MapOutputTracker
17/03/04 20:41:30 INFO SparkEnv: Registering BlockManagerMaster
17/03/04 20:41:31 INFO DiskBlockManager: Created local directory at C:\Users\Administrator.USER-20160219OS\AppData\Local\Temp\blockmgr-8339dad4-0230-405c-8ff3-f28fe073b327
17/03/04 20:41:35 INFO MemoryStore: MemoryStore started with capacity 972.5 MB
17/03/04 20:41:38 INFO HttpFileServer: HTTP File server directory is C:\Users\Administrator.USER-20160219OS\AppData\Local\Temp\spark-7aef918f-fd75-4153-833e-f29def7f1805\httpd-e95baaaa-f8c5-43e3-be14-8b45a90fce45
17/03/04 20:41:38 INFO HttpServer: Starting HTTP Server
17/03/04 20:41:40 INFO Utils: Successfully started service 'HTTP file server' on port 64166.
17/03/04 20:41:40 INFO SparkEnv: Registering OutputCommitCoordinator
17/03/04 20:41:42 INFO Utils: Successfully started service 'SparkUI' on port 4040.
17/03/04 20:41:42 INFO SparkUI: Started SparkUI at http://10.11.25.3:4040
17/03/04 20:41:43 WARN MetricsSystem: Using default name DAGScheduler for source because spark.app.id is not set.
17/03/04 20:41:43 INFO Executor: Starting executor ID driver on host localhost
17/03/04 20:41:47 INFO Utils: Successfully started service 'org.apache.spark.network.netty.NettyBlockTransferService' on port 64205.
17/03/04 20:41:47 INFO NettyBlockTransferService: Server created on 64205
17/03/04 20:41:47 INFO BlockManagerMaster: Trying to register BlockManager
17/03/04 20:41:47 INFO BlockManagerMasterEndpoint: Registering block manager localhost:64205 with 972.5 MB RAM, BlockManagerId(driver, localhost, 64205)
17/03/04 20:41:47 INFO BlockManagerMaster: Registered BlockManager
17/03/04 20:41:52 INFO MemoryStore: ensureFreeSpace(130448) called with curMem=0, maxMem=1019782103
17/03/04 20:41:52 INFO MemoryStore: Block broadcast_0 stored as values in memory (estimated size 127.4 KB, free 972.4 MB)
17/03/04 20:41:53 INFO MemoryStore: ensureFreeSpace(14276) called with curMem=130448, maxMem=1019782103
17/03/04 20:41:53 INFO MemoryStore: Block broadcast_0_piece0 stored as bytes in memory (estimated size 13.9 KB, free 972.4 MB)
17/03/04 20:41:53 INFO BlockManagerInfo: Added broadcast_0_piece0 in memory on localhost:64205 (size: 13.9 KB, free: 972.5 MB)
17/03/04 20:41:53 INFO SparkContext: Created broadcast 0 from textFile at LocalSpark.scala:20
17/03/04 20:41:56 INFO FileInputFormat: Total input paths to process : 1
17/03/04 20:41:56 INFO SparkContext: Starting job: foreach at LocalSpark.scala:29
17/03/04 20:41:58 INFO DAGScheduler: Registering RDD 3 (map at LocalSpark.scala:25)
17/03/04 20:41:58 INFO DAGScheduler: Got job 0 (foreach at LocalSpark.scala:29) with 1 output partitions
17/03/04 20:41:58 INFO DAGScheduler: Final stage: ResultStage 1(foreach at LocalSpark.scala:29)
17/03/04 20:41:58 INFO DAGScheduler: Parents of final stage: List(ShuffleMapStage 0)
17/03/04 20:41:58 INFO DAGScheduler: Missing parents: List(ShuffleMapStage 0)
17/03/04 20:41:58 INFO DAGScheduler: Submitting ShuffleMapStage 0 (MapPartitionsRDD[3] at map at LocalSpark.scala:25), which has no missing parents
17/03/04 20:41:59 INFO MemoryStore: ensureFreeSpace(4120) called with curMem=144724, maxMem=1019782103
17/03/04 20:41:59 INFO MemoryStore: Block broadcast_1 stored as values in memory (estimated size 4.0 KB, free 972.4 MB)
17/03/04 20:41:59 INFO MemoryStore: ensureFreeSpace(2337) called with curMem=148844, maxMem=1019782103
17/03/04 20:41:59 INFO MemoryStore: Block broadcast_1_piece0 stored as bytes in memory (estimated size 2.3 KB, free 972.4 MB)
17/03/04 20:41:59 INFO BlockManagerInfo: Added broadcast_1_piece0 in memory on localhost:64205 (size: 2.3 KB, free: 972.5 MB)
17/03/04 20:41:59 INFO SparkContext: Created broadcast 1 from broadcast at DAGScheduler.scala:861
17/03/04 20:41:59 INFO DAGScheduler: Submitting 1 missing tasks from ShuffleMapStage 0 (MapPartitionsRDD[3] at map at LocalSpark.scala:25)
17/03/04 20:41:59 INFO TaskSchedulerImpl: Adding task set 0.0 with 1 tasks
17/03/04 20:42:00 INFO TaskSetManager: Starting task 0.0 in stage 0.0 (TID 0, localhost, PROCESS_LOCAL, 2164 bytes)
17/03/04 20:42:00 INFO Executor: Running task 0.0 in stage 0.0 (TID 0)
17/03/04 20:42:00 INFO HadoopRDD: Input split: file:/C:/Users/Administrator.USER-20160219OS/Desktop/wordcount.txt:0+54
17/03/04 20:42:00 INFO deprecation: mapred.tip.id is deprecated. Instead, use mapreduce.task.id
17/03/04 20:42:00 INFO deprecation: mapred.task.id is deprecated. Instead, use mapreduce.task.attempt.id
17/03/04 20:42:00 INFO deprecation: mapred.task.is.map is deprecated. Instead, use mapreduce.task.ismap
17/03/04 20:42:00 INFO deprecation: mapred.task.partition is deprecated. Instead, use mapreduce.task.partition
17/03/04 20:42:00 INFO deprecation: mapred.job.id is deprecated. Instead, use mapreduce.job.id
17/03/04 20:42:01 INFO Executor: Finished task 0.0 in stage 0.0 (TID 0). 2253 bytes result sent to driver
17/03/04 20:42:01 INFO TaskSetManager: Finished task 0.0 in stage 0.0 (TID 0) in 1448 ms on localhost (1/1)
17/03/04 20:42:01 INFO TaskSchedulerImpl: Removed TaskSet 0.0, whose tasks have all completed, from pool
17/03/04 20:42:01 INFO DAGScheduler: ShuffleMapStage 0 (map at LocalSpark.scala:25) finished in 1.633 s
17/03/04 20:42:01 INFO DAGScheduler: looking for newly runnable stages
17/03/04 20:42:01 INFO DAGScheduler: running: Set()
17/03/04 20:42:01 INFO DAGScheduler: waiting: Set(ResultStage 1)
17/03/04 20:42:01 INFO DAGScheduler: failed: Set()
17/03/04 20:42:01 INFO DAGScheduler: Missing parents for ResultStage 1: List()
17/03/04 20:42:01 INFO DAGScheduler: Submitting ResultStage 1 (ShuffledRDD[4] at reduceByKey at LocalSpark.scala:27), which is now runnable
17/03/04 20:42:01 INFO MemoryStore: ensureFreeSpace(2224) called with curMem=151181, maxMem=1019782103
17/03/04 20:42:01 INFO MemoryStore: Block broadcast_2 stored as values in memory (estimated size 2.2 KB, free 972.4 MB)
17/03/04 20:42:01 INFO MemoryStore: ensureFreeSpace(1380) called with curMem=153405, maxMem=1019782103
17/03/04 20:42:01 INFO MemoryStore: Block broadcast_2_piece0 stored as bytes in memory (estimated size 1380.0 B, free 972.4 MB)
17/03/04 20:42:01 INFO BlockManagerInfo: Added broadcast_2_piece0 in memory on localhost:64205 (size: 1380.0 B, free: 972.5 MB)
17/03/04 20:42:01 INFO SparkContext: Created broadcast 2 from broadcast at DAGScheduler.scala:861
17/03/04 20:42:01 INFO DAGScheduler: Submitting 1 missing tasks from ResultStage 1 (ShuffledRDD[4] at reduceByKey at LocalSpark.scala:27)
17/03/04 20:42:01 INFO TaskSchedulerImpl: Adding task set 1.0 with 1 tasks
17/03/04 20:42:01 INFO TaskSetManager: Starting task 0.0 in stage 1.0 (TID 1, localhost, PROCESS_LOCAL, 1901 bytes)
17/03/04 20:42:01 INFO Executor: Running task 0.0 in stage 1.0 (TID 1)
17/03/04 20:42:02 INFO ShuffleBlockFetcherIterator: Getting 1 non-empty blocks out of 1 blocks
17/03/04 20:42:02 INFO ShuffleBlockFetcherIterator: Started 0 remote fetches in 55 ms
spark , 1
wujiadong , 1
hadoop , 1
python , 1
hello , 4
17/03/04 20:42:02 INFO Executor: Finished task 0.0 in stage 1.0 (TID 1). 1165 bytes result sent to driver
17/03/04 20:42:02 INFO TaskSetManager: Finished task 0.0 in stage 1.0 (TID 1) in 367 ms on localhost (1/1)
17/03/04 20:42:02 INFO TaskSchedulerImpl: Removed TaskSet 1.0, whose tasks have all completed, from pool
17/03/04 20:42:02 INFO DAGScheduler: ResultStage 1 (foreach at LocalSpark.scala:29) finished in 0.370 s
17/03/04 20:42:02 INFO DAGScheduler: Job 0 finished: foreach at LocalSpark.scala:29, took 5.915115 s
17/03/04 20:42:02 INFO SparkContext: Invoking stop() from shutdown hook
17/03/04 20:42:02 INFO SparkUI: Stopped Spark web UI at http://10.11.25.3:4040
17/03/04 20:42:02 INFO DAGScheduler: Stopping DAGScheduler
17/03/04 20:42:02 INFO MapOutputTrackerMasterEndpoint: MapOutputTrackerMasterEndpoint stopped!
17/03/04 20:42:03 INFO MemoryStore: MemoryStore cleared
17/03/04 20:42:03 INFO BlockManager: BlockManager stopped
17/03/04 20:42:03 INFO BlockManagerMaster: BlockManagerMaster stopped
17/03/04 20:42:03 INFO OutputCommitCoordinator$OutputCommitCoordinatorEndpoint: OutputCommitCoordinator stopped!
17/03/04 20:42:03 INFO SparkContext: Successfully stopped SparkContext
17/03/04 20:42:03 INFO ShutdownHookManager: Shutdown hook called
17/03/04 20:42:03 INFO ShutdownHookManager: Deleting directory C:\Users\Administrator.USER-20160219OS\AppData\Local\Temp\spark-7aef918f-fd75-4153-833e-f29def7f1805Process finished with exit code 0