CDN is a content delivery acceleration network widely used in the video cloud industry. Recently a new technology called PCDN has emerged, offering P2P functionality in a manner that is fully complementary and integrated with CDN. PCDN introduces P2P technology for CDN, which reduces costs while ensuring reliable service capabilities, making it an ideal platform for video services.
Alibaba Cloud PCDN (short for P2P + CDN) is a content delivery network based on P2P technology, in which P2P and PCDN work together in perfect unison to efficiently handle content delivery during heavy traffic. The distributed PCDN system relies on P2P core technology that seamlessly integrates with conventional CDN and cloud CDN, offering lower cost and higher quality when compared with CDN alone.
This article discusses the features, architecture, use cases, and advantages of using PCDN.
P2P Content Delivery Network (P2P CDN, hereinafter referred to as PCDN) is a low-cost and high-quality content delivery network service built by leveraging the massive fragmentation of idle resources in edge networks. You can access the service by integrating the PCDN SDK (hereinafter referred to as the SDK) to obtain equivalent (or slightly higher) CDN delivery quality, while significantly reducing delivery costs. It is incredibly useful in situations where you have to serve content in real time, such as ApsaraVideo Live, live streaming, large file downloads, etc.
The following is the process for handling an http request using PCDN:
A basic PCDN architecture has the following key components:
PCDN Architecture Diagram:
PCDN is best for services that offer video on demand, live streaming, and large file downloads. A few examples are as follows:
Now that we've introduced the technology, let's talk about the advantages offered by PCDN and why it's becoming so popular:
High Quality: Multi-level node scheduling achieved by combining CDN and P2P technology means that a request can be served by both CDN and multiple P2P sources at the same time. This resource redundancy improves service availability, which makes playback much smoother than it would be on a pure CDN, and the download rate for large files is massively improved. On an average, playback fluency reaches about 97% and latency is less than 1 second, which makes for a much better user experience.
Whether it's for live streaming or for hosting large static files, PCDN offers a more cost-effective and high-quality solution for your content delivery network.
Note: As of June 2018, Alibaba Cloud PCDN is not yet available on the international portal. You can visit the PCDN product page on the Mainland China portal for more info (website in Chinese).
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