C:\Users\edz>scala
Welcome to Scala 2.11.8 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_91).
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scala> :quit
右键 scala 目录 -》Make Directory as -》Generate Sources Root
右键 scala 目录-》New -》scala class -》 object ,名称为:WordCount
输入代码:
import org.apache.spark.SparkContext
import org.apache.spark.SparkConf
object WordCount {
def main(args: Array[String]) {
val inputFile = "D:\\spark_study\\wordcount.txt"
val conf = new SparkConf().setAppName("WordCount").setMaster("local")
val sc = new SparkContext(conf)
val textFile = sc.textFile(inputFile)
val wordCount = textFile.flatMap(line => line.split(" ")).map(word => (word, 1)).reduceByKey((a, b) => a + b)
wordCount.foreach(println)
}
}
"C:\Program Files\Java\jdk1.8.0_91\bin\java.exe" "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2020.1.4\lib\idea_rt.jar=52207:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2020.1.4\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_91\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext\sunmscapi.jar;C:\Program 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ons-cli-1.2.jar;D:\spark_study\localWarehouse\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar;D:\spark_study\localWarehouse\org\datanucleus\datanucleus-api-jdo\3.2.6\datanucleus-api-jdo-3.2.6.jar;D:\spark_study\localWarehouse\org\datanucleus\datanucleus-rdbms\3.2.9\datanucleus-rdbms-3.2.9.jar;D:\spark_study\localWarehouse\commons-pool\commons-pool\1.5.4\commons-pool-1.5.4.jar;D:\spark_study\localWarehouse\commons-dbcp\commons-dbcp\1.4\commons-dbcp-1.4.jar;D:\spark_study\localWarehouse\javax\jdo\jdo-api\3.0.1\jdo-api-3.0.1.jar;D:\spark_study\localWarehouse\javax\transaction\jta\1.1\jta-1.1.jar;D:\spark_study\localWarehouse\commons-httpclient\commons-httpclient\3.1\commons-httpclient-3.1.jar;D:\spark_study\localWarehouse\org\apache\calcite\calcite-avatica\1.2.0-incubating\calcite-avatica-1.2.0-incubating.jar;D:\spark_study\localWarehouse\org\apache\calcite\calcite-core\1.2.0-incubating\calcite-core-1.2.0-incubating.jar;D:\spark_study\localWarehouse\org\apache\calcite\calcite-linq4j\1.2.0-incubating\calcite-linq4j-1.2.0-incubating.jar;D:\spark_study\localWarehouse\net\hydromatic\eigenbase-properties\1.1.5\eigenbase-properties-1.1.5.jar;D:\spark_study\localWarehouse\org\apache\httpcomponents\httpclient\4.5.4\httpclient-4.5.4.jar;D:\spark_study\localWarehouse\org\codehaus\jackson\jackson-mapper-asl\1.9.13\jackson-mapper-asl-1.9.13.jar;D:\spark_study\localWarehouse\commons-codec\commons-codec\1.10\commons-codec-1.10.jar;D:\spark_study\localWarehouse\joda-time\joda-time\2.9.3\joda-time-2.9.3.jar;D:\spark_study\localWarehouse\org\jodd\jodd-core\3.5.2\jodd-core-3.5.2.jar;D:\spark_study\localWarehouse\org\datanucleus\datanucleus-core\3.2.10\datanucleus-core-3.2.10.jar;D:\spark_study\localWarehouse\org\apache\thrift\libthrift\0.9.3\libthrift-0.9.3.jar;D:\spark_study\localWarehouse\org\apache\thrift\libfb303\0.9.3\libfb303-0.9.3.jar;D:\spark_study\localWarehouse\org\apache\derby\derby\10.12.1.1\derby-10.12.1.1.jar;D:\spark_study\localWarehouse\org\apache\spark\spark-mllib_2.11\2.3.0\spark-mllib_2.11-2.3.0.jar;D:\spark_study\localWarehouse\org\scala-lang\modules\scala-parser-combinators_2.11\1.0.4\scala-parser-combinators_2.11-1.0.4.jar;D:\spark_study\localWarehouse\org\apache\spark\spark-graphx_2.11\2.3.0\spark-graphx_2.11-2.3.0.jar;D:\spark_study\localWarehouse\com\github\fommil\netlib\core\1.1.2\core-1.1.2.jar;D:\spark_study\localWarehouse\net\sourceforge\f2j\arpack_combined_all\0.1\arpack_combined_all-0.1.jar;D:\spark_study\localWarehouse\org\apache\spark\spark-mllib-local_2.11\2.3.0\spark-mllib-local_2.11-2.3.0.jar;D:\spark_study\localWarehouse\org\scalanlp\breeze_2.11\0.13.2\breeze_2.11-0.13.2.jar;D:\spark_study\localWarehouse\org\scalanlp\breeze-macros_2.11\0.13.2\breeze-macros_2.11-0.13.2.jar;D:\spark_study\localWarehouse\com\github\rwl\jtransforms\2.4.0\jtransforms-2.4.0.jar;D:\spark_study\localWarehouse\org\spire-math\spire_2.11\0.13.0\spire_2.11-0.13.0.jar;D:\spark_study\localWarehouse\org\spire-math\spire-macros_2.11\0.13.0\spire-macros_2.11-0.13.0.jar;D:\spark_study\localWarehouse\org\typelevel\machinist_2.11\0.6.1\machinist_2.11-0.6.1.jar;D:\spark_study\localWarehouse\com\chuusai\shapeless_2.11\2.3.2\shapeless_2.11-2.3.2.jar;D:\spark_study\localWarehouse\org\typelevel\macro-compat_2.11\1.1.1\macro-compat_2.11-1.1.1.jar;D:\spark_study\localWarehouse\org\scala-lang\scala-reflect\2.11.8\scala-reflect-2.11.8.jar;D:\spark_study\localWarehouse\org\scala-lang\scala-compiler\2.11.8\scala-compiler-2.11.8.jar;D:\spark_study\localWarehouse\org\scala-lang\modules\scala-xml_2.11\1.0.4\scala-xml_2.11-1.0.4.jar;D:\spark_study\localWarehouse\org\scala-lang\scala-library\2.11.8\scala-library-2.11.8.jar" WordCount
Using Spark's default log4j profile: org/apache/spark/log4j-defaults.properties
21/07/23 13:47:46 INFO SparkContext: Running Spark version 2.3.0
21/07/23 13:47:46 WARN NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
21/07/23 13:47:46 ERROR Shell: Failed to locate the winutils binary in the hadoop binary path
java.io.IOException: Could not locate executable null\bin\winutils.exe in the Hadoop binaries.
at org.apache.hadoop.util.Shell.getQualifiedBinPath(Shell.java:378)
at org.apache.hadoop.util.Shell.getWinUtilsPath(Shell.java:393)
at org.apache.hadoop.util.Shell.(Shell.java:386)
at org.apache.hadoop.util.StringUtils.(StringUtils.java:79)
at org.apache.hadoop.security.Groups.parseStaticMapping(Groups.java:116)
at org.apache.hadoop.security.Groups.(Groups.java:93)
at org.apache.hadoop.security.Groups.(Groups.java:73)
at org.apache.hadoop.security.Groups.getUserToGroupsMappingService(Groups.java:293)
at org.apache.hadoop.security.UserGroupInformation.initialize(UserGroupInformation.java:283)
at org.apache.hadoop.security.UserGroupInformation.ensureInitialized(UserGroupInformation.java:260)
at org.apache.hadoop.security.UserGroupInformation.loginUserFromSubject(UserGroupInformation.java:789)
at org.apache.hadoop.security.UserGroupInformation.getLoginUser(UserGroupInformation.java:774)
at org.apache.hadoop.security.UserGroupInformation.getCurrentUser(UserGroupInformation.java:647)
at org.apache.spark.util.Utils$$anonfun$getCurrentUserName$1.apply(Utils.scala:2464)
at org.apache.spark.util.Utils$$anonfun$getCurrentUserName$1.apply(Utils.scala:2464)
at scala.Option.getOrElse(Option.scala:121)
at org.apache.spark.util.Utils$.getCurrentUserName(Utils.scala:2464)
at org.apache.spark.SparkContext.(SparkContext.scala:292)
at WordCount$.main(WordCount.scala:9)
at WordCount.main(WordCount.scala)
21/07/23 13:47:46 INFO SparkContext: Submitted application: WordCount
21/07/23 13:47:46 INFO SecurityManager: Changing view acls to: edz
21/07/23 13:47:46 INFO SecurityManager: Changing modify acls to: edz
21/07/23 13:47:46 INFO SecurityManager: Changing view acls groups to:
21/07/23 13:47:46 INFO SecurityManager: Changing modify acls groups to:
21/07/23 13:47:46 INFO SecurityManager: SecurityManager: authentication disabled; ui acls disabled; users with view permissions: Set(edz); groups with view permissions: Set(); users with modify permissions: Set(edz); groups with modify permissions: Set()
21/07/23 13:47:48 INFO Utils: Successfully started service 'sparkDriver' on port 52244.
21/07/23 13:47:49 INFO SparkEnv: Registering MapOutputTracker
21/07/23 13:47:49 INFO SparkEnv: Registering BlockManagerMaster
21/07/23 13:47:49 INFO BlockManagerMasterEndpoint: Using org.apache.spark.storage.DefaultTopologyMapper for getting topology information
21/07/23 13:47:49 INFO BlockManagerMasterEndpoint: BlockManagerMasterEndpoint up
21/07/23 13:47:49 INFO DiskBlockManager: Created local directory at C:\Users\edz\AppData\Local\Temp\blockmgr-2ef0a030-120a-49aa-ad7e-2da8fdd565d8
21/07/23 13:47:49 INFO MemoryStore: MemoryStore started with capacity 1981.2 MB
21/07/23 13:47:49 INFO SparkEnv: Registering OutputCommitCoordinator
21/07/23 13:47:50 INFO Utils: Successfully started service 'SparkUI' on port 4040.
21/07/23 13:47:50 INFO SparkUI: Bound SparkUI to 0.0.0.0, and started at http://LAPTOP-0VG107DP:4040
21/07/23 13:47:50 INFO Executor: Starting executor ID driver on host localhost
21/07/23 13:47:50 INFO Utils: Successfully started service 'org.apache.spark.network.netty.NettyBlockTransferService' on port 52257.
21/07/23 13:47:50 INFO NettyBlockTransferService: Server created on LAPTOP-0VG107DP:52257
21/07/23 13:47:50 INFO BlockManager: Using org.apache.spark.storage.RandomBlockReplicationPolicy for block replication policy
21/07/23 13:47:50 INFO BlockManagerMaster: Registering BlockManager BlockManagerId(driver, LAPTOP-0VG107DP, 52257, None)
21/07/23 13:47:50 INFO BlockManagerMasterEndpoint: Registering block manager LAPTOP-0VG107DP:52257 with 1981.2 MB RAM, BlockManagerId(driver, LAPTOP-0VG107DP, 52257, None)
21/07/23 13:47:50 INFO BlockManagerMaster: Registered BlockManager BlockManagerId(driver, LAPTOP-0VG107DP, 52257, None)
21/07/23 13:47:50 INFO BlockManager: Initialized BlockManager: BlockManagerId(driver, LAPTOP-0VG107DP, 52257, None)
21/07/23 13:47:50 INFO MemoryStore: Block broadcast_0 stored as values in memory (estimated size 214.5 KB, free 1981.0 MB)
21/07/23 13:47:50 INFO MemoryStore: Block broadcast_0_piece0 stored as bytes in memory (estimated size 20.4 KB, free 1981.0 MB)
21/07/23 13:47:50 INFO BlockManagerInfo: Added broadcast_0_piece0 in memory on LAPTOP-0VG107DP:52257 (size: 20.4 KB, free: 1981.2 MB)
21/07/23 13:47:50 INFO SparkContext: Created broadcast 0 from textFile at WordCount.scala:10
21/07/23 13:47:51 INFO FileInputFormat: Total input paths to process : 1
21/07/23 13:47:51 INFO SparkContext: Starting job: foreach at WordCount.scala:12
21/07/23 13:47:51 INFO DAGScheduler: Registering RDD 3 (map at WordCount.scala:11)
21/07/23 13:47:51 INFO DAGScheduler: Got job 0 (foreach at WordCount.scala:12) with 1 output partitions
21/07/23 13:47:51 INFO DAGScheduler: Final stage: ResultStage 1 (foreach at WordCount.scala:12)
21/07/23 13:47:51 INFO DAGScheduler: Parents of final stage: List(ShuffleMapStage 0)
21/07/23 13:47:51 INFO DAGScheduler: Missing parents: List(ShuffleMapStage 0)
21/07/23 13:47:51 INFO DAGScheduler: Submitting ShuffleMapStage 0 (MapPartitionsRDD[3] at map at WordCount.scala:11), which has no missing parents
21/07/23 13:47:51 INFO MemoryStore: Block broadcast_1 stored as values in memory (estimated size 4.7 KB, free 1981.0 MB)
21/07/23 13:47:51 INFO MemoryStore: Block broadcast_1_piece0 stored as bytes in memory (estimated size 2.8 KB, free 1981.0 MB)
21/07/23 13:47:51 INFO BlockManagerInfo: Added broadcast_1_piece0 in memory on LAPTOP-0VG107DP:52257 (size: 2.8 KB, free: 1981.2 MB)
21/07/23 13:47:51 INFO SparkContext: Created broadcast 1 from broadcast at DAGScheduler.scala:1039
21/07/23 13:47:51 INFO DAGScheduler: Submitting 1 missing tasks from ShuffleMapStage 0 (MapPartitionsRDD[3] at map at WordCount.scala:11) (first 15 tasks are for partitions Vector(0))
21/07/23 13:47:51 INFO TaskSchedulerImpl: Adding task set 0.0 with 1 tasks
21/07/23 13:47:51 INFO TaskSetManager: Starting task 0.0 in stage 0.0 (TID 0, localhost, executor driver, partition 0, PROCESS_LOCAL, 7870 bytes)
21/07/23 13:47:51 INFO Executor: Running task 0.0 in stage 0.0 (TID 0)
21/07/23 13:47:51 INFO HadoopRDD: Input split: file:/D:/spark_study/wordcount.txt:0+81
21/07/23 13:47:51 INFO Executor: Finished task 0.0 in stage 0.0 (TID 0). 1156 bytes result sent to driver
21/07/23 13:47:51 INFO TaskSetManager: Finished task 0.0 in stage 0.0 (TID 0) in 263 ms on localhost (executor driver) (1/1)
21/07/23 13:47:51 INFO TaskSchedulerImpl: Removed TaskSet 0.0, whose tasks have all completed, from pool
21/07/23 13:47:51 INFO DAGScheduler: ShuffleMapStage 0 (map at WordCount.scala:11) finished in 0.379 s
21/07/23 13:47:51 INFO DAGScheduler: looking for newly runnable stages
21/07/23 13:47:51 INFO DAGScheduler: running: Set()
21/07/23 13:47:51 INFO DAGScheduler: waiting: Set(ResultStage 1)
21/07/23 13:47:51 INFO DAGScheduler: failed: Set()
21/07/23 13:47:51 INFO DAGScheduler: Submitting ResultStage 1 (ShuffledRDD[4] at reduceByKey at WordCount.scala:11), which has no missing parents
21/07/23 13:47:51 INFO MemoryStore: Block broadcast_2 stored as values in memory (estimated size 3.1 KB, free 1981.0 MB)
21/07/23 13:47:51 INFO MemoryStore: Block broadcast_2_piece0 stored as bytes in memory (estimated size 1945.0 B, free 1981.0 MB)
21/07/23 13:47:51 INFO BlockManagerInfo: Added broadcast_2_piece0 in memory on LAPTOP-0VG107DP:52257 (size: 1945.0 B, free: 1981.2 MB)
21/07/23 13:47:51 INFO SparkContext: Created broadcast 2 from broadcast at DAGScheduler.scala:1039
21/07/23 13:47:51 INFO DAGScheduler: Submitting 1 missing tasks from ResultStage 1 (ShuffledRDD[4] at reduceByKey at WordCount.scala:11) (first 15 tasks are for partitions Vector(0))
21/07/23 13:47:51 INFO TaskSchedulerImpl: Adding task set 1.0 with 1 tasks
21/07/23 13:47:51 INFO TaskSetManager: Starting task 0.0 in stage 1.0 (TID 1, localhost, executor driver, partition 0, ANY, 7649 bytes)
21/07/23 13:47:51 INFO Executor: Running task 0.0 in stage 1.0 (TID 1)
21/07/23 13:47:51 INFO ShuffleBlockFetcherIterator: Getting 1 non-empty blocks out of 1 blocks
21/07/23 13:47:51 INFO ShuffleBlockFetcherIterator: Started 0 remote fetches in 4 ms
(spark,2)
(hadoop,2)
(sparkstreaming,1)
(flink,2)
(kafka,1)
(clickhouse,1)
(redis,1)
(hbase,1)
21/07/23 13:47:51 INFO Executor: Finished task 0.0 in stage 1.0 (TID 1). 1138 bytes result sent to driver
21/07/23 13:47:51 INFO TaskSetManager: Finished task 0.0 in stage 1.0 (TID 1) in 48 ms on localhost (executor driver) (1/1)
21/07/23 13:47:51 INFO TaskSchedulerImpl: Removed TaskSet 1.0, whose tasks have all completed, from pool
21/07/23 13:47:51 INFO DAGScheduler: ResultStage 1 (foreach at WordCount.scala:12) finished in 0.062 s
21/07/23 13:47:51 INFO DAGScheduler: Job 0 finished: foreach at WordCount.scala:12, took 0.742531 s
21/07/23 13:47:51 INFO SparkContext: Invoking stop() from shutdown hook
21/07/23 13:47:51 INFO SparkUI: Stopped Spark web UI at http://LAPTOP-0VG107DP:4040
21/07/23 13:47:51 INFO MapOutputTrackerMasterEndpoint: MapOutputTrackerMasterEndpoint stopped!
21/07/23 13:47:51 INFO MemoryStore: MemoryStore cleared
21/07/23 13:47:51 INFO BlockManager: BlockManager stopped
21/07/23 13:47:51 INFO BlockManagerMaster: BlockManagerMaster stopped
21/07/23 13:47:51 INFO OutputCommitCoordinator$OutputCommitCoordinatorEndpoint: OutputCommitCoordinator stopped!
21/07/23 13:47:51 INFO SparkContext: Successfully stopped SparkContext
21/07/23 13:47:51 INFO ShutdownHookManager: Shutdown hook called
21/07/23 13:47:51 INFO ShutdownHookManager: Deleting directory C:\Users\edz\AppData\Local\Temp\spark-4c379c11-3156-4fac-9cef-261adb05a623
Process finished with exit code 0
创建Web工程,使用eclipse ee创建maven web工程 1.右键项目,选择Project Facets,点击Convert to faceted from 2.更改Dynamic Web Module的Version为2.5.(3.0为Java7的,Tomcat6不支持). 如果提示错误,可能需要在Java Compiler设置Compiler compl
最近一直在看python的document,打算在基础方面重点看一下python的keyword、Build-in Function、Build-in Constants、Build-in Types、Build-in Exception这四个方面,其实在看的时候发现整个《The Python Standard Library》章节都是很不错的,其中描述了很多不错的主题。先把Build-in Fu
学习函数式编程
package base;
import java.text.DecimalFormat;
public class Main {
public static void main(String[] args) {
// Integer a = 4;
// Double aa = (double)a / 100000;
// Decimal
Java中的泛型的使用:1.普通的泛型使用
在使用类的时候后面的<>中的类型就是我们确定的类型。
public class MyClass1<T> {//此处定义的泛型是T
private T var;
public T getVar() {
return var;
}
public void setVa