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Martez Fields
I pulled this chapter together from dozens of sources that were at times somewhat contradictory. Facts on the ground change over time and depend who is telling the story and what audience they're addressing. I tried to create as coherent a narrative as I could. If there are any errors I'd be more than happy to fix them. Keep in mind this article is not a technical deep dive. It's a big picture type article. For example, I don't mention the word microservice even once :-)
Given our discussion in the What is Cloud Computing? chapter, you might expect Netflix to serve video using AWS. Press play in a Netflix application and video stored in S3 would be streamed from S3, over the internet, directly to your device.
Another relevant factoid is Netflix is subscription based. Members pay Netflix monthly and can cancel at any time. When you press play to chill on Netflix, it had better work. Unhappy members unsubscribe.
The client is the user interface on any device used to browse and play Netflix videos. It could be an app on your iPhone, a website on your desktop computer, or even an app on your Smart TV. Netflix controls each and every client for each and every device.
Everything that happens before you hit play happens in the backend, which runs in AWS. That includes things like preparing all new incoming video and handling requests from all apps, websites, TVs, and other devices.
In 2007 Netflix introduced their streaming video-on-demand service that allowed subscribers to stream television series and films via the Netflix website on personal computers, or the Netflix software on a variety of supported platforms, including smartphones and tablets, digital media players, video game consoles, and smart TVs.
Netflix succeeded. Netflix certainly executed well, but they were late to the game, and that helped them. By 2007 the internet was fast enough and cheap enough to support streaming video services. That was never the case before. The addition of fast, low-cost mobile bandwidth and the introduction of powerful mobile devices like smart phones and tablets, has made it easier and cheaper for anyone to stream video at any time from anywhere. Timing is everything.
Building out a datacenter is a lot of work. Ordering equipment takes a long time. Installing and getting all the equipment working takes a long time. And as soon they got everything working they would run out of capacity, and the whole process had to start over again.
The long lead times for equipment forced Netflix to adopt what is known as a vertical scaling strategy. Netflix made big programs that ran on big computers. This approach is called building a monolith. One program did everything.
What Netflix was good at was delivering video to their members. Netflix would rather concentrate on getting better at delivering video rather than getting better at building datacenters. Building datacenters was not a competitive advantage for Netflix, delivering video is.
It took more than eight years for Netflix to complete the process of moving from their own datacenters to AWS. During that period Netflix grew its number of streaming customers eightfold. Netflix now runs on several hundred thousand EC2 instances.
The advantage of having three regions is that any one region can fail, and the other regions will step in handle all the members in the failed region. When a region fails, Netflix calls this evacuating a region.
The header image is meant to intrigue you, to draw you into selecting a video. The idea is the more compelling the header image, the more likely you are to watch a video. And the more videos you watch, the less likely you are to unsubscribe from Netflix.
The first thing Netflix does is spend a lot of time validating the video. It looks for digital artifacts, color changes, or missing frames that may have been caused by previous transcoding attempts or data transmission problems.
A pipeline is simply a series of steps data is put through to make it ready for use, much like an assembly line in a factory. More than 70 different pieces of software have a hand in creating every video.
The idea behind a CDN is simple: put video as close as possible to users by spreading computers throughout the world. When a user wants to watch a video, find the nearest computer with the video on it and stream to the device from there.
In 2007, when Netflix debuted its new streaming service, it had 36 million members in 50 countries, watching more than a billion hours of video each month, streaming multiple terabits of content per second.
At the same time, Netflix was also devoting a lot of effort into all the AWS services we talked about earlier. Netflix calls the services in AWS its control plane. Control plane is a telecommunications term identifying the part of the system that controls everything else. In your body, your brain is the control plane; it controls everything else.
In 2011, Netflix realized at its scale it needed a dedicated CDN solution to maximize network efficiency. Video distribution is a core competency for Netflix and could be a huge competitive advantage.
The number of OCAs on a site depends on how reliable Netflix wants the site to be, the amount of Netflix traffic (bandwidth) that is delivered from that site, and the percentage of traffic a site allows to be streamed.
Within a location, a popular video like House of Cards is copied to many different OCAs. The more popular a video, the more servers it will be copied to. Why? If there was only one copy of a very popular video, streaming the video to members would overwhelm the server. As they say, many hands make light work.
Right now, up to 100% of Netflix content is being served from within ISP networks. This reduces costs by relieving internet congestion for ISPs. At the same time, Netflix members experience a high-quality viewing experience. And network performance improves for everyone.
What may not be immediately obvious is that the OCAs are independent of each other. OCAs act as self-sufficient video-serving archipelagos. Members streaming from one OCA are not affected when other OCAs fail.
Netflix is an American subscription video on-demand over-the-top streaming service. The service primarily distributes original and acquired films and television shows from various genres, and it is available internationally in multiple languages.[6]
Launched on January 16, 2007, nearly a decade after Netflix, Inc. began its pioneering DVD-by-mail movie rental service, Netflix is the most-subscribed video on demand streaming media services, with over 277.7 million paid memberships in more than 190 countries as of July 2024.[5][7] By 2022, "Netflix Original" productions accounted for half of its library in the United States and the namesake company had ventured into other categories, such as video game publishing of mobile games through its flagship service. As of October 2023, Netflix is the 23rd most-visited website in the world, with 23.66% of its traffic coming from the United States, followed by the United Kingdom at 5.84% and Brazil at 5.64%.[8][9]
Initially, Netflix offered a per-rental model for each DVD but introduced a monthly subscription concept in September 1999.[20] The per-rental model was dropped by early 2000, allowing the company to focus on the business model of flat-fee unlimited rentals without due dates, late fees, shipping and handling fees, or per-title rental fees.[21] In September 2000, during the dot-com bubble, while Netflix was suffering losses, Hastings and Randolph offered to sell the company to Blockbuster for $50 million. John Antioco, CEO of Blockbuster, thought the offer was a joke and declined, saying, "The dot-com hysteria is completely overblown."[22][23] While Netflix experienced fast growth in early 2001, the continued effects of the dot-com bubble collapse and the September 11 attacks caused the company to hold off plans for its initial public offering (IPO) and to lay off one-third of its 120 employees.[24]
DVD players were a popular gift for holiday sales in late 2001, and demand for DVD subscription services were "growing like crazy", according to chief talent officer Patty McCord.[25] The company went public on May 23, 2002, selling 5.5 million shares of common stock at US$15.00 per share.[26] In 2003, Netflix was issued a patent by the U.S. Patent & Trademark Office to cover its subscription rental service and several extensions.[27] Netflix posted its first profit in 2003, earning $6.5 million on revenues of $272 million; by 2004, profit had increased to $49 million on over $500 million in revenues.[28] In 2005, 35,000 different films were available, and Netflix shipped 1 million DVDs out every day.[29]
In 2004, Blockbuster introduced a DVD rental service, which not only allowed users to check out titles through online sites but allowed for them to return them at brick and-mortar stores.[30] By 2006, Blockbuster's service reached two million users, and while trailing Netflix's subscriber count, was drawing business away from Netflix. Netflix lowered fees in 2007.[28] While it was an urban legend that Netflix ultimately "killed" Blockbuster in the DVD rental market, Blockbuster's debt load and internal disagreements hurt the company.[30]
On April 4, 2006, Netflix filed a patent infringement lawsuit in which it demanded a jury trial in the United States District Court for the Northern District of California, alleging that Blockbuster's online DVD rental subscription program violated two patents held by Netflix. The first cause of action alleged Blockbuster's infringement of copying the "dynamic queue" of DVDs available for each customer, Netflix's method of using the ranked preferences in the queue to send DVDs to subscribers, and Netflix's method permitting the queue to be updated and reordered.[31] The second cause of action alleged infringement of the subscription rental service as well as Netflix's methods of communication and delivery.[32] The companies settled their dispute on June 25, 2007; terms were not disclosed.[33][34][35][36]
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