Leaf is a distributed ID generation service launched by meituan. Its name is taken from the words of German philosopher and mathematician Leibniz: "there are no two identity leaves in the world." ("there are no two same leaves in the world"), taking a name has such moral meaning, meituan programmer Niu break!
Posted by Chris_Evans on Wed, 25 May 2022 07:06:18 +0300
This note is the learning content of Alibaba Cloud Tianchi Dragon Ball Project SQL Training Camp
The link is: https://tianchi.aliyun.com/specials/promotion/aicampsql
Practice Questions - Part 1
Create a view that satisfies the following three conditions (the view name is ViewPractice5_1). Using the product table as a referen ...
Posted by [e]r!k on Wed, 25 May 2022 06:53:14 +0300
Ruan Yifeng great God ECMAScript 6 beginner level: https://es6.ruanyifeng.com/
If you don't like the typesetting here, you can go to my YuQue to have a look. YuQue is really unique
let and const commands
The variable declared by let is only valid in the code block in which it is located.
The variable i ...
Posted by RedMaster on Wed, 25 May 2022 06:43:55 +0300
Volatile is usually used in concurrent programming to ensure the visibility between threads, but the elements in the array modified by volatile cannot ensure the visibility between threads. For example, ConcurrentHashMap uses Unsafe way to access u.getobjectvolatile (tab, ((long) I < < ashift) + abase);
The following code cannot guarantee ...
Posted by patch2112 on Wed, 25 May 2022 06:42:14 +0300
Install ceph and openstack multi node
Connected to the switch, but no ip
10.201.7.0/24: it can be connected to the external network, which is the defa ...
Posted by pranesh on Wed, 25 May 2022 06:40:08 +0300
Network Engineering Fundamentals - Dynamic ACL
Experimental environment: EVE-NG
The underlying configuration (no sh is not typed out, just configure it by yourself):
R1(config)#no ip routing
R1(config)#ip default-gateway 188.8.131.52
R1(config-if)#ip address 184.108.40.206 255.255.255.0
R2(config)#no ip ...
Posted by ndjustin20 on Wed, 25 May 2022 06:39:38 +0300
Experiment 11: read / write the specified location information of the disk (just complete the reading)
1, Experimental purpose
(1) Knowledge of Disk Physics.
(2) Master the API for disk operation provided by Windows system.
(3) Read / write the specified sector according to the entered sector number.
2, Experimental preparation knowledge: intro ...
Establishment and traversal of binary tree (1) Establishment of binary tree Establish a binary tree by traversing in the first order and in the second order: In the pre order traversal sequence of binary tree, the first element is always the value of the root node of the tree. In the middle order traversal sequence, the value of the node of the ...
Posted by Brandon_R on Wed, 25 May 2022 06:18:05 +0300
It is said that String builder is more efficient than String in dealing with String splicing, but sometimes there may be some deviation in our understanding.
Recently, when I tested the efficiency of data import, I found that my previous understanding of string builder was wrong. Later, I found out the logic of this piece by mean ...
Posted by gausie on Wed, 25 May 2022 06:05:45 +0300
Tip: after the article is written, the directory can be generated automatically. Please refer to the help document on the right for how to generate it
Tip: Here you can add the general contents to be recorded in this article:
Tip: the following is t ...
Posted by theresandy on Wed, 25 May 2022 05:45:41 +0300