It is a common operation to move code from one branch to another branch in a multi-branch git repository. Normally there are two scenarios:Want to move all changes in one branch to another branch, now it's called git merge Want to move only some change/changes from one branch to another branch, now it's called git cherry-pickUsageThe purpose of git cherry-pick is to apply some change from one branch to another branch. git cherry-pick [commitHash]The above command is to apply the commit commitHash to the current working branch. It will create a new commit in the current working b...

GitHub, GitLab and BitBucket are the three most famous code hosting platform in the world. They have different features which allow teams or individuals to share code with others remotely. In case you want to build your own code hosting server so that you can host and share the code by yourself, you can install and set up your own server. In this post, we will walk you through a guide on installing and setting up GitLab server on Linux environment.gitlab is a web based code hosting tool which is open sourced to everyone. Below we start the installation and setup process. The Linux system we ar...

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 penetrationCache penetration is a scenario where the data to be searched doesn't exist at DB and the returned empty result set is...

When using git for version control, there is frequent need on undoing commits due to some unexpected changes. This post will introduce how to undo changes with git command in different cases.Undo commitA common undo case is that some commit needs to be reverted as the commit contains error. In this case, the code is already committed. The command to revert the commit isgit revert HEADThis command will add new a commit to the existing head to undo the previous commit. It will not change the previous commit history, hence there is no risk of losing changes.If need to revert multiple commits, run...

Github Actions is a CI/CD service created by Github. It aims to make it easy to automate all software workflows, now with world-class CI/CD. Build, test, and deploy code right from GitHub. It was launched in October 2018 and was officially available to all users in November 2019.This post will give an introduction of Github Actions and explain how it works.What is Github ActionsNormally Continuous Integration includes some steps, fetching code, running test, sshing into remote server instance, deploying code/binary on remote server etc. They are called actions in Github Actions. Lots...

New IT trends will dominate in 2020. Big data management, customer satisfaction, security concerns, mobile apps, artificial intelligence (AI), test automation, DevOps and agile methodologies are a few of these rising technologies and trends. With their rise, Quality assurance (QA) has to take the testing game a notch up, especially with using smart test management tools for their testing. Test Automation StaysA report by Research and Markets estimates the global automation testing market to grow with an annual growth rate of 15% which would amount to $81.93 billion by 2023. In 2020, ...

The front end web developers are the openers for the visitors to visit the web page. It is also known as the client-side development, works predominantly with HTML, CSS, and Javascript. The tools and techniques are the important players of the front end web development. The developer must be aware of the updation of web technologies.The scope is evergreen with this technology as every company or business needs a website to showcase their profile. There are many objectives must be measured while developing the site which means there are multiple devices with various sizes and the developer must...

git bisect is a very powerful command for finding out which commit is a bad commit when bug occurs. The rationale behind this command is that it pin locates the bad commit by divide and conquer. It divides the commit history into two equal parts, then determines whether the bad commit is at the first half or at the other half. This process will continue until the bad commit is located.Here is a really good example created by bradleyboy, this is a simple git repository which demonstrates a bad commit in the index.html. First, please clone the repository into local.$ git clone git@gith...