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  The First Bite on etcd Code

Etcd, one of the crucial components of Kubernetes. If APIServer is the heart, then etcd is the blood vessel that sends the end state of Kubernetes resources to various “organs”, providing high-speed, stable storage, and supporting APIServer’s high load performance. What if the etcd is not working properly? Just the condition as someone has a vascular disease. The deeper you know about them, the better diagnose you can make when issues occur. from unspl...

   SOURCE CODE,ETCD     2022-02-12 01:03:14

  How expensive is a MySQL query?

Database access speed is always the bottle neck of many applications. Many application have large amount of data to search, retrieve and display nowadays. How do we improve the performance of our applications, how do we reduce the cost of database access? Apart from the design of database, the quality of the query is also one important factor to take care.  But before that, we need to know how much network traffic a query will consume. Yunyang,Zhang from Nubee in Singapore did some research...

   MySQL,Network traffic,Query     2013-04-09 05:13:33

  CASSANDRA data model

Cassandra is an open source distributed database, it combines dynamic key/value and column oriented feature of Bigtable. Features of Cassandra are: Flexible schema, no need to design schema first, it's very convenient to add or delete strings Support range search on keys High usability, extensible. The single node error will not affect the cluster. We can think Cassandra's data model as a 4 or 5 dimensional Hash. COLUMN Columns is the smallest data unit in Cassandra, it is a 3 dimensional data...

   Cassandra,database,sort     2013-06-08 22:07:40

  What happens on the Internet in one minute?

In one minute, 216,000 images are shared on Instagram, $83,000 sales happen on Amazon, 1.8 million Likes are clicked on Facebook, also 72 hours videos are uploaded to YouTube. This image is from Omee and it shows us what happens on the Internet in one minute. For example, how many Tweets are posted, how many pictures are viewed, how many minutes communication through Skype. The data on the graph is from PC Mag, Business Insider and other websites. In one minute, 2 million searches on Google, 70...

   Infographic,60 seconds,Internet     2013-08-01 06:47:51

  In College, Working Hard to Learn High School Material

In June, Desiree Smith was graduated from Murry Bergtraum High. Her grades were in the 90s, she said, and she had passed the four state Regents exams. Since enrolling last month at LaGuardia Community College in Queens, Ms. Smith, 19, has come to realize that graduating from a New York City public high school is not the same as learning. She failed all three placement tests for LaGuardia and is now taking remediation in reading, writing and math. So are Nikita Thomas, ofBedford Stuyves...

   Education,College,High school,Material,Knowledge transfer     2011-10-24 11:51:39

  Tips for improving PHP efficiency

0. Using single quote to replace double quote to enclose string literal, this will be a bit faster. Because PHP engine will search variables in double quoted string. 1. If a method in class can be declared as static, then make it static, this will be 4 times faster. 2. $row["id"] is 7 times faster than $row[id] 3. echo is faster than print, and you should use multiple parameters instead of string concatenation, i.e use comma(,) instead of dot(.) to concatenate string. For example echo $str1,$str...

   PHP, efficiency, tips     2012-10-01 19:39:06

  What is good design?

Some quotes about good design from a Germany designer Dieter Rams in documentary "Objectified": Good design should be innovative Good design should make a product useful Good design is aesthetic design Good design will make a product understandable Good design is honest Good design is unobtrusive Good design is long-lived Good design is consistent in every detail Good design is environmentally friendly Good design is as little design as possible This brings up a question -- what...

   METRO,SIMPLICITY,GOOD DESIGN,PRINCIOPLE,UNIX PHILOSOPHY     2012-05-09 06:48:11

  Some laws of interactive design

The well known quote from Alan Cooper is   Conforming to the standard unless there is a better choice. There are some best practices in interaction design. How many do you know? 1. Fitts' Law The time from one start point to target point is determined by two parameters: The distance to the target and the size of the target. )D and W in above picture), the formula is : T=a+blog2(D/W+1). It was first proposed by Paul Fitts, it is mathematical model used to predict the time from any poin...

   interaction design, laws, Fitts' law     2012-11-16 11:25:24

  Designing Great API Docs

Writing documentation is one of those things that is dreaded by many developers. It takes a lot of effort and time to get right. And too often, people take shortcuts. This is sad, because well designed documentation is the key to getting people excited about your project, whether it's open source or a developer focused product. In fact, I argue that the most important piece of UX for a developer product isn't the homepage or the sign up process or the SDK download. It's the API documentati...

   API docs,Design API docs,Advice     2012-03-09 23:15:00

  8 very useful and free web security testing tools

With more pervasive of web applications, web security threats are becoming increasingly prominent. Hackers gain web server control by exploiting web server vulnerabilities and SQL injection vulnerabilities, then they may tamper with web content, or steal important internal data, the more serious is to inject malicious code into web pages to affect visitors of websites. Attention is gradually warming up to Web Application Security. Here we recommend eight very useful and free web security testing...

   Website, security,Web security,Attack     2012-07-22 10:59:09

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