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1. Environmental preparation On a linux machine, install the hadoop running environment. For the installation method, see: Establishment of HADOOP operation environment 2. Start HDFS and run MapReduce 2.1. Configure cluster 1. Configuration: hadoop-env.sh Get the installation path of JDK in Linux system: [root@ hadoop101 ~]# echo $JAVA_HOME /op ...

Summary of Spring Boot actual combat project (1) Project design ideas (steps) Development environment construction and log git common commands Learning methods List of projects available for reference 1, Project design ideas (steps) 1. Analysis function: what are the functions and application scena ...

1. PySnooper - debugging Kit Installation: pip install pysnooper Using PySnooper to add a decorator to the function to be debugged, you can get the log of the running function, including the executed code line, execution time and the time when the local variable changes Example import pysnooper @pys ...

Article directory Spring 1. Core Container 2,Data Access 3,Web 4,AOP 5,Test Correspondence between Spring version and Java version IoC 1. XML parsing: 2. Create objects dynamically based on the information obtained in step 1 The spring-ioc.xml file is as follows Class User Spring provides point p ...

Group tour import time import random import math people=[('seymour','BOS'), ('FRANNY','DAL'), ('ZOOEY','CAK'), ('WALT','MIA'), ('buddy','ORD'), ('LES','OMA')] destination='LGA' Flight data schedule.txt Start, end, departure time, arrival time, price Code optim ...

Coding specifications in the work, which need to be written in the future. Before encoding, first write according to Alibaba's development specifications, if using idea, use its plug-ins. In the case of springmvc, the following styles are best used to define the path: @RequestMapping(value = "/upda ...

  1, Download Interface   1. Main interface download display MainWindow first initializes aria and starts aria2. The startup method is in download.py.  # start aria2         start_aria = StartAria2Thread()         self.threadPool.append(start_aria)         self.threadPool[0].start()         sel ...

I have combed the workflow and key source code of MyBatis when it is used alone. Now let's see how MyBatis works when it is integrated with Spring Start with use Spring integrates MyBatis 1. Introduce dependency. In addition to the dependency of MyBatis, you need to introduce the dependency of MyB ...

Untitled 1. Automatic assembly When Spring assembles Bean properties, it is sometimes quite clear that a reference to a Bean needs to be assembled to the specified properties.For example, if there is only one Bean of type org.mybatis.spring.SqlSessionFactoryBean in our application context, then any ...

Each section in the python3-cookbook explores the best solution of Python 3 to a given problem in three parts: problem, solution, and discussion, or how Python 3's own data structure, functions, classes, and so on, can be better used in a given problem.This book is very helpful for understanding Python 3 and improving Python programming capabil ...