High website load occurs when a large number of users simultaneously perform actions on the website. As a result, the number of requests initiated on the server is higher than the number of requests the website can handle. This leads to slower website performance, decreased productivity, delays, and, as a result, the web application may completely stop responding to user requests.
It is important to note that there is no quantitative indicator for this definition, as the number of requests that can be processed may vary. For example, one website may be able to handle one and a half thousand requests without affecting its performance, while for another, the threshold may be two hundred requests. Therefore, Highload is the inability of a specific IT system to cope with the current load.
The most common example is an online store during seasonal sales that cannot cope with the number of requests to the server, resulting in the loss of real customers and potential customer loyalty. It affects the user experience and leads to loss of traffic.
Possible website performance problems include:
- The least severe problem is slow website performance. Thus, users can still use the web application, but the server responds less quickly.
- More unpleasant is the occurrence of failures and errors when initiating certain user actions.
- Complete website unavailability.
- Partial or complete data loss. The web application may not be able to handle the load and fail to save data.
How to work with highload systems?
When it comes to a highload website, it refers to its ability to withstand high loads. Since there is no single definition of high load, there is no single solution. There is no universal code snippet that can make all websites handle the same amount of load. It requires tuning the architecture of the website.
What should be the algorithm of action:
- Identifying the components of the system that affect its performance.
- Implementing all possible forms of testing.
- As for preventive measures, preparing tools that will help to quickly restore the system in case of a failure and minimize the consequences.
- Conducting an analysis and implementing metrics for studying and classifying errors and their further diagnosis.
How to work with web applications?
Developing high-load websites involves creating a monolithic site or using a microservices architecture. The latter approach involves having several services that are interconnected through APIs. It should be understood that scaling any project is impossible without identifying the weak parts of the system, and it is important to identify them in advance and work on their improvement in a timely manner.
What are the general steps that can be taken?
- Load balancing. Traffic is distributed between several servers, which increases performance and reduces downtime. Load balancers can be hardware or software-based, and they are configured to distribute traffic based on various factors, such as server availability, CPU usage, and network traffic.
- Code and database optimization. The speed of web applications and the ability to process a large number of requests depend on their efficiency. Caching, query optimization, database indexing, or other techniques can be used.
- Caching. It can be performed at various levels, such as client-side, server-side, or database level, and its goal is to reduce the load on the system.
- Horizontal and vertical scaling. This is essentially increasing the number of servers, the goal of which is to improve website performance.
- Using frameworks. There are many of them, and their task is to provide high performance for applications with high loads. This can be Node.js, Ruby on Rail, and others.
- Content Delivery Networks (CDNs). CDNs are distributed server networks that allow for efficient delivery of web content to users, reducing the load on the server and response time.
- Cloud computing. For example, using cloud services such as Microsoft Azure or Google Cloud Platform. Such services can provide numerous tools for scaling, managing, and optimizing performance, which can help the site cope with a large number of requests.
The entire process of working with high-load web applications requires a comprehensive approach, including identifying the weak parts of the system, using appropriate tools and techniques, and continuous improvement.
