Shulou(Shulou.com)06/03 Report--

At 8 o 'clock in the evening of January 24,2020, a New Year's Eve song and dance "Ode to Spring Tide" kicked off the Spring Festival Gala of the Year of the Rat. "This is street dance," 2019 first divine song "Wolf Disco" adaptation version "New Year Disco,""Snow Dumpling Love,""Walk through the scene" and many other programs will push the Spring Festival Gala to wave after wave climax.

This year's Spring Festival Gala not only has a huge cast, but even the host lineup has undergone a "big change of blood," and various innovative programs have won applause from the audience. This Spring Festival Gala can be called a visual feast of science and technology. Among them, the Spring Festival Gala stage creates three-layer three-dimensional dance beauty for the first time. Meanwhile, it uses flying screen technology to create 360-degree surround landscape. Through excellent video production, the audience can feel the ultimate experience of "naked eye 3D" in front of the screen.

In addition, this year's Spring Festival Gala Beijing main venue and Guangdong, Hong Kong and Macao Dawan District, Zhengzhou sub-venue comprehensive interaction through 5G network, CCTV for the first time produced 8K ultra-high definition TV version 2020 Spring Festival Gala, bringing unprecedented visual shock to the audience. This year's Spring Festival Gala also cooperated with fast hands to launch 1 billion Spring Festival Gala red envelopes. Through innovative large and small screen linkage mode, the peak flow of this year's Spring Festival Gala hit a new high over the years.

However, in the face of constant traffic "peak" and complicated network environment, it is the ultimate test of strength for the technology "logistics" behind it. In order to ensure the high-quality and stable transmission of the Spring Festival Gala live broadcast, Jinshan Cloud, as one of the backstage technical support parties of CCTV Spring Festival Gala this year, assists customers to rapidly improve their "combat effectiveness" with more perfect technical services, comprehensively escorts CCTV network Spring Festival Gala live broadcast, Station B New Year's Celebration, and fully supports Top 10 Short Video customers to win hard battles, guarantees tens of millions of interactive live broadcasts with multiple technologies, and wins unanimous praise from users.

"Intelligent dispatching + multi-stream optimization" dual-engine escort CCTV Spring Festival Gala live broadcast

Over the years, the live broadcast of major events and activities, such as CCTV Spring Festival Gala, National Two Sessions, World Cup and other activities and sports events, have been guaranteed by Jinshan Cloud. Jinshan Cloud, which has experienced the actual combat test of live broadcast, has more technology and experience accumulation in live broadcast guarantee.

In order to ensure that a large number of users synchronize and watch CCTV's Spring Festival Gala live program in HD, Jinshan Cloud team partners have conducted a detailed assessment of the bandwidth required for live broadcast in advance. At the same time, Jinshan Cloud makes use of its sufficient node resources and bandwidth resources to ensure stable support for the peak bandwidth pressure formed by live broadcasting. If the peak traffic exceeds the forecast, Kingsoft Cloud will add nodes to the customer's traffic scheduling group within 1 minute to expand the total capacity to meet bandwidth requirements.

Jinshan cloud technology team predicts that at every hour of the 20:00 party, it will enter the peak period of traffic; at the same time, combined with the business promotion content of major customers, there will be a user visit climax caused by red envelope activities. In order to ensure high concurrency and high QPS data traffic access, Jinshan Cloud adopts the intelligent scheduling system independently developed by Jinshan Cloud to better ensure the realization of intelligent scheduling during live broadcasting.

This system includes three functional modules: "Load Balancer,""Jinshan Cloud Eagle Eye" and "Intelligent Valve." Jinshan Cloud team first monitors the data with "Jinshan Cloud Eagle Eye" to see whether the data reaches the "water level." If the "water level" is close, the "intelligent valve" will be opened to warn and allocate resources in advance, and then the intelligent dispatching system adjusts the flow trend, thus realizing intelligent dispatching of flow.

Among them, Jinshan Cloud KVS, full name of KSyun Virtual Server, is an automatic Load Balancer system based on LVS R & D and transformation optimization, which has the characteristics of high availability, good stability and strong scalability. Kingsoft Cloud KVS can set different weight values for each real server, so that resources with good performance can bear more user requests and make reasonable use of existing resources. At the same time, Jinshan Cloud KVS can also automatically query the load situation of real server and dynamically adjust the weight to make reasonable resource allocation.

In the process of live broadcast guarantee, on the basis of CCTV and Jinshan Cloud live broadcast source stations, multiple live broadcast source stations and transcoding clusters are built, and CCTV HLS/HDS/FLV pull streams are supported after transcoding processing through RTMP/FLV pull streams. It is also equipped with a disaster recovery primary and backup solution, which can backup each other among multiple source sites to achieve second-level switching, greatly diverting high-concurrency access requests from source sites.

It is worth mentioning that Jinshan Cloud takes the lead in supporting live push and pull over QUIC in the industry. Jinshan Video Cloud Streaming Services QUIC+ solution (the fluency still reaches 96.51% when the packet loss rate reaches 30%) plays an important role in this live broadcast re-protection.

In addition, Jinshan Cloud team adopted the industry-first multi-stream optimization technology in the guarantee process. That is to say, the same live broadcast signal channel is allowed to be injected into CDN at multiple points at the same time, the coexistence of signals is ensured by aligning and arranging multiple original signal sources, and the jitter situation of different signal sources is sensed in time through the self-developed high-sensitivity jitter algorithm, and the optimal signal source is selected as the main signal distributed downward on the millisecond scale, and the smooth switching of the optimal signal source on the millisecond level is supported without causing frame skipping or repeated playback. At the same time, under the strong support of Jinshan Cloud's tested internal link dynamic optimization, it ensures stable transmission of live broadcast signals within CDN.

"Intelligent dispatching system + source station diversion + edge live broadcast content pre-pull + multi-stream optimization technology" jointly constructs the technical strength of Jinshan Cloud video live broadcast, which also becomes the advantage of Jinshan Cloud in live broadcast architecture.

High bit rate, high concurrency QPS request provides a full set of capabilities service system

With the rapid development of Internet technology, mobile device capabilities are increasing, the number of users is increasing, and activity modes are becoming more novel. High bitrate, high concurrency, and high QPS have gradually become the basic capability requirements of cloud service enterprises. This CCTV Spring Festival Gala live broadcast innovatively adopts 5G ultra-clear, VR live broadcast form, up to 1 billion times of full-network video playback volume, high concurrent QPS (number of user requests per second) red envelope interaction, which poses a great challenge to Jinshan cloud service capability.

In order to more effectively guarantee the stability of ultra-clear video and VR video transmission at peak business, Jinshan Cloud Technology Team and CCTV network re-optimized the system architecture together, realized all-round linkage in technology, management, operation and other dimensions through resource opening, and ensured the smooth progress of activities to the greatest extent.

At present, Jinshan Cloud has 1000+CDN nodes in China, and the bandwidth reserve of the whole network reaches 100Tbps, which can ensure the rapid and stable distribution of the content of CCTV Spring Festival Gala to the greatest extent. In addition, Jinshan Cloud's CDN products are based on ultra-large-scale distributed clusters and have massive concurrency capabilities, which can provide stable, smooth and rich network acceleration services. At the same time, Jinshan Cloud's holographic transparent data support system can realize all-round high availability service guarantee and provide customers with low-latency, flexible and transparent CDN services.

For HD video, VR and other video applications, Jinshan Cloud Video Cloud Distribution Node carries out special large-capacity design. At the system architecture level, it adopts the application of new generation Cache architecture Dorado, multi-level cache technology and multi-thread technology to improve concurrency performance and stability by more than 50%; at the hardware device level, it adopts the third generation DMA technology.(SSD+MemCache+AIO), specially optimized for compiler, storage and network, I/O performance increased by 400%; at the transmission protocol level, Jinshan Cloud TCP network has been optimized by kernel, transmission efficiency increased by 30%.

In order to further reduce the bandwidth occupation, Jinshan Cloud provides a complete CDN product matrix including live broadcast, on-demand, download, small file and a series of technical systems including edge computing, intelligent HD, P2P, QUIC bilateral acceleration, etc.

Among them, Jizhi HD integrates multiple technologies to reduce the encoded video volume and save 20%-40% video transmission bandwidth. With KSC265 transcoding technology, the video transmission bandwidth can be reduced twice. Kingsoft Cloud provides AI+ AV1 intelligent cloud transcoding service with compression rate up to 80.57%, leading the industry.

At the edge computing level, Jinshan Cloud Edge Computing currently speeds up file upload by 40%, uploads success rate to 99.5%, and API service query success rate to 99.9% in big data upload and API acceleration scenarios; in same-city live broadcast scenarios, friends and relatives in the same city are allowed to pull streams nearby, greatly saving backbone network bandwidth and improving viewing quality.

In addition to the basic means such as intelligent HD, multi-stream optimization and protocol optimization, Jinshan Cloud has also made corresponding technical reserves for ultra-high definition and VR live broadcasting under the background of 5G. CMAF low latency distribution scheme not only solves the delay "hard injury" of HLS, DASH and other protocols, but also has multi-bit rate adaptive function. Combined with aligned transcoding technology, it can simultaneously provide 8K, 4K, 1080P or even lower multi-bit rate adaptive output, so as to match the extreme experience that end users under different network conditions can enjoy HD or smooth at the same time.

Because of this, with the complete set of technical service system and resource reserve capacity provided by Jinshan Cloud, including video cloud and CDN, Jinshan Cloud has withstood the high traffic of HD video and wave after wave of red envelope traffic peak impact.

Customer Success Assurance Platform provides comprehensive support capabilities

In addition to optimizing the underlying technology, Jinshan Cloud innovatively developed a "customer success guarantee platform" to ensure the success of the CCTV Spring Festival Gala live broadcast, which played an important role in the CCTV Spring Festival Gala re-protection and achieved twice the result with half the effort.

The industry is no stranger to "customer success assurance platforms." At the "2019 Gold Medal Operation and Maintenance Conference" held on December 26,2019, Jinshan Cloud's "Customer Success Guarantee Platform" was awarded as "Annual Excellent Case of 2019 Operation and Maintenance Industry."

As we all know, public cloud provides convenience for customer resource elasticity, but at the same time, it brings difficulties for public cloud operation and maintenance personnel, such as lack of technical means to see problems from customer perspective, lack of effective proactive guarantee means and lack of global real-time cognition of customer product experience. In order to help public cloud customers succeed in business and achieve win-win business results, Jinshan Cloud launched "Customer Success Guarantee Platform" to provide all-round guarantee capability.

Among them, the "re-protection robot" developed by Jinshan Cloud can automatically create a special guarantee communication group according to the re-protection demand, and communicate within the centralized group aiming at the problems during the customer re-protection period to avoid information fragmentation;"Re-protection robot" monitors the resource stability of customers according to their needs, adds "all-round monitoring," creates corresponding "customer resource monitoring large screen," and sets "sensitive alarm threshold," so as to ensure that customers can know the problem one step ahead; In addition, the "re-protection robot" distributes the alarm and work order to the handler, and supervises the handler to complete the processing within a certain time, which greatly improves the manual work efficiency.

In addition, in order to ensure the smooth implementation of CCTV live broadcast re-guarantee, Jinshan Cloud has set up a special group of nearly 50 people, spanning product, R & D, operation, customer service and risk control teams, providing 724 hours of remote plus on-site guarantee, providing technical on-site service, arranging application operation and maintenance, network operation and maintenance for on-site guarantee, realizing second-level response and emergency treatment, and solving problems in the first time. In addition, in addition to the regular operation team, Jinshan Cloud specially arranged emergency teams to take additional measures for emergencies. The two teams operated independently in case of temporary emergencies to ensure the smooth progress of re-protection.

In the special period of preventing virus transmission by the whole people, when we laugh at the Spring Festival Gala at home, every heavy protection programmer of Jinshan Cloud actively does a good job of hygiene prevention, enters the door to measure body temperature, everyone wears masks in 2020 Jinshan Cloud Spring Festival Guarantee Command Center, for CCTV Spring Festival Gala live broadcast smoothly contribute their own strength.

It is undeniable that Jinshan Cloud successfully restored the live broadcast of CCTV Spring Festival Gala, which once again proved Jinshan Cloud's strong technical strength. In the future, with the arrival of 5G Ultra HD and VR era, Jinshan Cloud will provide more comprehensive technology and service capabilities to protect more major events and live broadcasts of events.

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