BackgroundIn distributed systems, there is one effect where the unavailability of one service or some services will lead to the service unavailability of the whole system, this is called service avalanche effect. A common way to prevent service avalanche is do manual service fallback, in fact Hystrix also provides another option beside this.Definition of Service Avalanche EffectService avalanche effect is a kind of effect where the service provider fails to provide service which causes the service caller also fail to work. And this kind of service unavailability will propagate to the whol...

When maintaining code using version control systems such as git, it is unavoidable that we need to rollback some wrong commits either due to bugs or temp code revert. In this case, rookie developers would be very nervous because they may get lost on what they should do to rollback their changes without affecting others, but to veteran developers, this is their routine work and they can show you different ways of doing that.In this post, we will introduce two major ones used frequently by developers.git resetgit revertWhat are their differences and corresponding use cases? We will discuss them ...

If you know your stuff when it comes to tech, you might be inspired to start contributing articles to tech blogs. A friend or colleague may suggest the idea to you, or you may see an invitation for submissions, much like the one on this website. Sounds like a great idea; but what do you know about writing articles, blog posts, or other types of content? Writing is a skill, and there are also practical aspects to writing that you need to be aware of before you start creating your own pieces. Getting started as a tech writer means addressing each of the following factors to ensure a successful a...

Programming software takes a tremendous amount of focus and effort. Working hard to transform code into software is an exciting feeling. It’s easy to get lost in your work as the hours fly by. I’ve done this many times. However, writing code can also be frustrating in many cases. I’ve been a programmer for many years, and I still spend hours debugging. Most of the time this level of debugging requires sitting down and focusing. After many years of this, you will be a prime candidate for back pain and repetitive stress injuries. I’ve found a way to prevent this from happ...

Programmers are always high in demand in software industry: take any corporate blue chip Software Company India for instance; programmers are playing a pivotal role in company’s business and relevant growth. In that case if you are planning to pursue a programmer’s career and earn fat package, here goes the range of option for your further study.Alternatively, if you are an employer and you want to understand the basic idea of coding, the outline description of popular programming language will give you extra leverage for doing recruitment, coordination with your team, etc. Ja...

 While Client/Server communication model is ubiquitous nowadays, most of them involve socket programming knowledge. In this post, I will introduce some rudimentary aspects of it:(1) Short/Long-lived TCP connection.Short-lived TCP connection refers to following pattern: Client creates a connection to server; send message, then close the connection. If Client wants to transmit information again, repeat the above steps. Because establishing and destroying TCP sessions have overhead, if Client needs to have transactions with Server frequently, long-lived connecti...

For a software engineer, at least from my own experience, maintaining an existing software project would take up a considerable amount of time: adding new features, fixing tricky bugs, and so on. In this post, I will share some some tips about how to become a veteran from a novice quickly when facing a new project.(1) Get familiar with the background knowledge of the project.Every software has its own purposes and users: a device driver serves the specified hardware, whilst a SMS gateway helps routing the messages all over the world. So before delving into the code, you should get an overview ...

 When I begin to learn a new programming language, I will try and master the debugger for it as early as possible. For example, in 2013, while I touched the Go, there seems only gdb for use. Although gdb itself is not a good choice (From Debugging Go Code with GDB):As a consequence, although GDB can be useful in some situations, it is not a reliable debugger for Go programs, particularly heavily concurrent ones. But at that time there was no other choice. So after delve came out, I switched to it without hesitation. Though I am not an expert of delvecode, I still try m...