SEARCH KEYWORD -- Algebraic Data Type
Mutli-inheritance bug between python 2.7 and 3.7
When we have run a py3.7 code under py2.x or a py2.x code under 3.x ,if a class do mutli-inheritance from 2 parent and the 2 parents also got inheritance from same parent, the different way to handle inheritance chain between python 2 and 3 will cause some running time bug: Assume we got this sample program inheritTest.py : # Purpose: Test mutli-inheritance different between python2 and 3 # Author: Yuancheng Liu # Created: 2019/05/16 class A: def getVal(self): print("cal...
PYTHON,PYTHON 3,INHERITANCE 2019-05-16 08:33:52
Introduction to DTLS(Datagram Transport Layer Security)
Secure communication has become a vital requirement on the Internet. Lots of information transferred through the Internet are sensitive data such as financial transactions, medical information, media streaming etc. To ensure security of data transferred on the Internet, a few secure protocols have been designed including SSL/TLS and IPsec. Many large websites in the world have adopted TLS. Apart from SSL/TLS, there is some other protocol designed to be used in special cases. One of them is ...
Demo on creating worker pool in GoLang
A worker pool is a pool where a specified number of workers(usually goroutine) created and run to pick up tasks. This can allow multiple tasks to be ran at the same time while keeping the number of workers a fixed number to avoid overuse of resource in the program. There are usually two approaches of creating worker pool. One is with fixed number of workers pre-created One is creating worker when needed until the max number of workers created In this post, we will cover the demonstration of cr...
WORKER POOL,GOLANG,GOROUTINE 2021-01-24 05:04:00
Mock Solutions for GoLang Unit Test
In Go development, Unit Test is inevitable. And it is essential to use Mock when writing Unit Tests. Mock can help test isolate the business logic it depends on, enabling it to compile, link, and run independently. Mock needs Stub. Stub function replaces the real business logic function, returns the required result, and assists the test. I involved the related test code for Controllers while writing Kubernetes Operator recently, and there would be mocks for GRPC and HT...
Peculiarities of cloud infrastructure
MarketsandMarkets claims that the cloud computing market is worth more than $545 bln nowadays. Moreover, by Thales, nearly 60% of worldwide commercial data is stored in the cloud today. Nay, under Exploding Topics, about 90% of large companies across the world use cloud infrastructure. So, the mentioned technology is incredibly popular among business owners worldwide presently. However, not so many company holders, as well as managers, know enough about the specified solutions. That's because mo...
CLOUD INFRASTRUCTURE,DATA STORAGE 2022-12-30 12:00:44
Data Scientists and Their Harder Skills than Big Data
The field of data science is often confused with that of big data. Data science is an aid to decision makers in a company with a logical approach. Who is a Data Scientist? A Data Scientist reviews a huge collection of data(that may extend to a couple of terabytes of disk space or thousands of excel sheets). This humongous chunk of data is not feasible for being handled, sorted and analyzed by a single person. Here we require the help of data science, and most recently, the field of A...
BIG DATA 2017-12-13 04:22:55
What is cache penetration, cache breakdown and cache avalanche?
When designing and developing highly available system, cache is an very important consideration. It is useful to cache some frequently accessed data so that they can be accessed quickly and also cache can protect the downstream system like DB from being hit too often. To provide better cache design in large systems, some problems may need to be considered first. In this post, we will talk about some frequently discussed cache problems and mitigation plans. Cache penetration Cache penetrati...
SYSTEM DESIGN,CACHE PENETRATION,CACHE BREAKDOWN,CACHE AVALANCHE 2020-04-10 08:43:00
Google CEO : Facebook holds its users hostage
Google CEO Larry Page claimed in a media interview recently that it’s unfortunate that Facebook has been pretty closed with their data while Google is in the business of searching dataPage has been attacking Facebook ban on the search engine to search its data. In fact, the battle between the two sides has been going on for several years, and in June 2011 Google launched its social networking service Google+ which somehow further exacerbated the tension. On Monday, Page, in an interview...
Google,Facebook,Hostage,Larry Page 2012-05-23 05:58:07
Why should we drop or reduce use of MD5?
MD5 is a frequently used one-way hash algorithm, it is commonly used in following situations: Check data integrity. We take hash of the data stored in two different places and compare them. If the hash results are the same, then there is no need to check the actual data. This utilizes the collision-resistant feature. Two different data block will have little chance that their hash values will be the same. Many data service providers use such technique to check repeated data to avoild repeating...
MD5,Vulnerability,attack 2012-09-29 04:47:49
Text editor vs IDE
A meaningless editor war Many people like to debate which editor is the best. The biggest controversy is between Emacs and vi. vi supporters like to say: "Look it's very fast to type in vi, our fingers no need to leave the keyboard, we even no need to use the up,down,left and right keys" Emacs supporters often downplayed this and said: "What's the use of typing fast if I just need to press one key and it equals to dozens keys you type in vi?"In fact, there is another group of people who like to ...
Editor,IDE,Structured editor,vi 2013-05-20 12:03:39
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