Programmer Group

Level 1: Statistics of user churn Task description This task: according to the user behavior data, write MapReduce program to count the loss of users. Relevant knowledge This training is an intermediate difficulty MapReduce programming exercise, which simulates the statistical analysis of e-commerce data in real scenes. Therefore, it is ...

Catalog 1. Problem Description 2. Writing Code + Packaging Project in intellij idea 3. Upload jar package to Linux in xftp 4. Preparing input data + Running jar package + Viewing input results in hadoop 1. Problem Description With MapReduce, for each user, A suggests 10 users who are not friends with A, but have the most common friends w ...

Ranking statistics of Chinese Universities Based on MapReduce Overall thinking ① Fileinputformat reads data ② Mapper stage is simple for data processing ③ Serialization implements custom sorting ④ Partition partition processing ⑤ Reducer writes out data ⑥ Main class settings The specific implementation is as follows Driver main class, inclu ...

Three components JobClient (prepare to run environment)JobTracker (receive job)TaskTracker (initialize job) Note that this is written in version 1.x and Hadoop 2. X and is managed by yarn. There are no JobTracker and TaskTracker Comparison between old and new Hadoop MapReduce frameworks 1. The client remains unchanged, and most of its call ...

1, Experimental purpose Master the basic MapReduce programming methods through experiments;Master the methods to solve some common data processing problems with MapReduce, including data merging, data De duplication, data sorting and data mining. 2, Experimental platform Operating system: Ubuntu 18.04 (or Ubuntu 16.04)Hadoop version: 3.2.2 ...

Level 1: data cleaning Task description This task: clean the data according to certain rules. Programming requirements According to the prompt, add code in the editor on the right to clean the data according to certain rules. Data description is as follows: a.txt; Data segmentation method: one or more spaces; Data location: / user/test/ ...

2,MapReduce 2.1. Introduction to MapReduce The core idea of MapReduce is "divide and conquer", which is suitable for a large number of complex task processing scenarios (large-scale data processing scenarios). Map is responsible for "dividing", that is, dividing complex tasks into several "simple tasks" for ...

Summary This is about hadoop Installation tests for. stay server110 Install the configuration on and synchronize to server111,server112 Environmental Science Centos 7 jdk 1.8 hadoop-3.2.1 server110 192.168.1.110 server111 192.168.1.111 server112 192.168.1.112 install #decompression [root@server110 software]# tar -xzvf hadoop ...