SparkConf sparkConf = new SparkConf().setMaster("local").setAppName("JD Word Counter"); Themasterspecifies local which means that this program should connect to Spark thread running on thelocalhost. App name is
package *; /** * @program: simple_tools * @description: * @author: ChenWenLong * @create: 2019-06-04 14:06 **/ public class WordUtils { public WordUtils() { super(); } /** * 功能描述: * 〈将str中的空格替换成分割符',',wrapLength表示从str的最后一个字符往回数的索引位置〉 * ...
HadoopTraditional processingHDFSHiveTrends and technologies are changing very rapidly with time. In advent of 20th century, the scope of internet was limited and so forth the expectations of the users were also limited. Now a days;...doi:10.1007/978-981-10-3433-6_36Ravinder Yadav...
Executes a program encapsulated in a JAR file. The filename argument is the name of a JAR file with a manifest that contains a line in the form Main-Class:classname that defines the class with the public static void main(String[] args) method that serves as your application's starting po...
//EnhancedwordcountprogramthatusesaStreamTokenizer .*; classWordCount{ publicstaticintwords=0; publicstaticintlines=0; publicstaticintchars=0; publicstaticvoidwc(Readerr)throwsIOException{ StreamTokenizertok=newStreamTokenizer(r); tok.resetSyntax(); tok.wordChars(33,255); tok.whitespaceChars(0,'')...
程序次序规则(Program Order Rule):一个线程内,逻辑上书写在前面的操作先行发生于书写在后面的操作。 锁定规则(Monitor Lock Rule):一个unLock操作先行发生于后面对同一个锁的lock操作。“后面”指时间上的先后顺序。 volatile变量规则(Volatile Variable Rule):对一个volatile变量的写操作先行发生于后面对这个变量的读...
FlatMapFunction<String, Tuple2<String, Integer>> { public void flatMap(String value, Collector<Tuple2<String, Integer>> out) throws Exception { // 按空格分组 String[] words = value.split(" "); for (String word : words) { // 将数据进行整合 out.collect(new Tuple2<>(word, 1)); }...
/* 批处理的Word Count * 下面著名数据类型为了更好的学习,scala也可以不著名类型 * */ object WordCount { def main(args: Array[String]): Unit = { //创建一个执行环境:批处理 val env:ExecutionEnvironment = ExecutionEnvironment.getExecutionEnvironment; //注意这里引用的是flink.api.scala下的ExecutionEn...
程序计数器(Program Counter Register): 线程私有,是一块较小的内存空间,它的作用可以看做是当前线程所执行的字节码的行号指示器。 JVM栈(JVM Stacks): 线程私有,生命周期与线程相同。虚拟机栈描述的是Java方法执行的内存模型:每个方法被执行的时候都会同时创建一个栈帧(Stack Frame)用于存储局部变量表、操作栈、动...
File file2 = new File("C:\\Program Files (x86)\\Tencent\\WeChat","WeChat.exe"); Runtime ec = Runtime.getRuntime(); ec.exec(file2.getAbsolutePath()); } } (二)文件字节输入、输出流 相关构造器与方法: 输入流:FileInputStream(String name); FileInputStream(File file); 读取方法:int ...