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kafka in a nutshell

IntroductionKafka is a distributed publish-subscribe messaging system that is designed to be fast, scalable and reliable. It can be used in data analysis, stream processing and other similar tasks. Th

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what does "this" refer to in javascript?

Introductionthis in javascript is always a mysterious thing. Some programmers who have written a lot of javascript code still cannot tell the value of this every now and then. So today, I decided to w

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re-embrace hexo and hueman

About a month ago, I started writing blogs in Chinese using WordPress. I stuck to the plan for about several days then decided to use English instead. The reason is unbelievably simple: typing English

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An Illustration of Various Encoding Schemes

What are encoding schemes?Encoding schemes are ways to store and retrieve characters in computers. For example, in ISO-8859-1(which is one of various encoding schemes), we use 01100001 to denote a, an

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the machanism of garbage collectors in Java

There are several garbage collectors in Java, each has its specific usage scenario. To understand garbage collection, we first have to understand how heaps are divided in Java. Heaps are divided into

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Inheritance in Javascript

Javascript uses prototype chains to make inheritance work, that’s a little odd given that other OOP languages usually use class and extend. So to fully understand inheritance in javascript, we first h

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Where to go

I haven’t written my blog for a long time, partly it’s due to my sheer laziness, partly because I gathered nobody would even find it, let alone read it. But anyway, I decided to write something tonigh

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Hadoop Internals -- Configuration

IntroductionAs what is called, Configuration is used to store all kinds of configurations in the hadoop platform, either they are from files(like core-default.xml) or from users(set via conf.setInt(&q

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I arrived in Hangzhou yesterday

I arrived in Hangzhou yesterday, and I could feel that the amounts of dopamine released in my brain fluctuated from time to time. At first I felt really happy, I was not sure why. Then I felt sort of

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change openwrt source to UTSC

The following steps only apply to Netgear 4300 and openwrt 15.05.1. Modify /etc/opkg.conf to the following lines. 1234567891011dest root /dest ram /tmplists_dir ext /var/opkg-listsoption overlay_root