Flink learning from 0 to 1 - Chapter 5 Flink stream processing API
1. Flink stream processing API
1.1 Environment
1.1.1 getExecutionEnvironment
Create an execution environment that represents the context of the current executing program. If the program is called independently, this method returns to the local execution environment; If the program is called from the command-line client to submit to the clu ...
Posted by abhishekphp6 on Wed, 11 May 2022 16:00:44 +0300
Oracle - Summary of the use of Mybatis and sql optimization
preface
Before writing, this blog will be updated constantly to sort out and summarize the sql optimization problems in the development work (actual combat process); Because the author works in the big data Department, the amount of data is basically very large, so he pays more attention to the performance under big data (but for some oper ...
Posted by AustinP on Wed, 11 May 2022 13:43:15 +0300
Hive Performance Tuning Guide
Using Hive to build offline data warehouse is a very common scheme in enterprises. Although Hive's usage scenario is to process big data through batch processing, it is usually insensitive to processing time. However, in the case of limited resources, we need to pay attention to Hive's performance tuning to facilitate the rapid output of data. ...
Posted by Greaser9780 on Wed, 11 May 2022 06:27:37 +0300
Data warehouse 001 - full backup of time zipper
Demo in mysql
Full backup of zipper during mysql demonstration:
1, Demonstrate the first and second full backups.
1. First, there is the business system table.
//Enter the test database.
use test
//Create business table user_data and give the initial business data.
create table user_data(
userid int,
ustate varchar(4)
);
insert into user_da ...
Posted by Mark.P.W on Tue, 10 May 2022 06:57:38 +0300
Hadoop based environment construction
Hadoop based environment construction
Environment construction
Local environment
The single node mode that can be used for development has no concept of distribution
Pseudo distributed environment
A node represents an entire cluster, but in the concept of distribution, a node acts as all the roles in the distribution
Fully distributed
The ...
Posted by englishman69 on Mon, 09 May 2022 23:40:28 +0300
Spark core components, operation architecture and RDD creation
Spark core components
Before explaining the Spark architecture, let's first understand several core components of Spark and find out their functions. 1. Application:Spark application User programs built on Spark, including Driver code and code running in the Executor of each node of the cluster. It consists of one or more Job jobs. As show ...
Posted by Someone789 on Sun, 08 May 2022 23:43:36 +0300
Taobao crawler, data analysis, children's wear
requests crawler
Now Taobao needs to log in to retrieve goods, so you need to get cookies from your account. In chrome, F12 is a simple packet capture plug-in. Select the network tag, check the header of the package one by one, and find that the package beginning with search needs my cookie Copy the circle part and convert it into diction ...
Posted by tieded on Sun, 08 May 2022 06:19:59 +0300
Detailed steps for setting up a cluster
zookeeper cluster construction
1, Cluster planning
Install three virtual machines. The IP address and host name are set as follows
IP
host name
Software
192.168.1.66
SQG
JDK\zookeeper
192.168.1.2
hadoop1
JDK\zookeeper
192.168.1.3
hadoop2
JDK\zookeeper
2, Environment preparation (the following three virtual machines need to be ope ...
Posted by MentalMonkey on Sat, 07 May 2022 23:48:20 +0300
Climb to station b video comment user information! These comments are the great God!
Recently, Mr. Ma Baoguo is very popular in station b. the video playback volume of him is very high. The video comment area of station b is full of talents who speak well. Write a crawler to crawl the user information and comment content in the comment area of station b.
1, Preparatory work
1. Tools
(1) Chrome Google browser installation add ...
Posted by Hiro on Sat, 07 May 2022 07:36:40 +0300
A bug triggered a contest between hair. I won an overwhelming victory. Can you keep your hair?
I met a very strange problem while debugging the company's project a few days ago. Today I'll study it here
Follow official account: Java architects alliance, update technical articles every day
scene
As a PDA interface is newly added to the company to query the historical parking flow data, I first check the qualified data from the database ...
Posted by Sangre on Fri, 06 May 2022 20:42:28 +0300