computer science

Open Connect

Open Connect is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Open Connect rather than just read about it. In short: Open Connect is a content distribution network specifically developed by Netflix to deliver its TV shows and movies to avoid traffic and fees. Netflix provides physical appliances to internet service providers that allow them to avoid traffic during peak hours of streaming or sustain the anticipated ones.

Key takeaways

Open Connect belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Open Connect to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Open Connect from memory before moving on to harder problems.

Reference excerpt

Open Connect is a content distribution network specifically developed by Netflix to deliver its TV shows and movies to avoid traffic and fees. Netflix provides physical appliances to internet service providers that allow them to avoid traffic during peak hours of streaming or sustain the anticipated ones. By shipping copies of content to these appliances ahead of time, the devices can store duplicates of titles, thereby reducing the network burden. Also, Netflix places its servers in locations with the highest number of subscribers and forms partnerships with ISP networks or IXPs. Furthermore, Netflix adapts its content to the quality of the network. This is achieved by sending three copies of each title, each at a different quality level, to its servers. For example, if a user's ISP is overwhelmed or the Internet connection is poor, the system can select a lower-bitrate version of the title.

History Netflix launched Open Connect in 2012. Since then, Netflix has spent over $1 billion to develop and distribute more than 8,000 Open Connect Appliances (OCA). The service started working on the free-of-charge distribution of OCAs in cooperation with ISPs. So far, more than 1,000 ISPs have acquired and installed OCAs, which has allowed them to save $1.25 billion by 2021. In the case of an OCA that is hosted at an IXP, Netflix maintains ownership of the OCA and is responsible for covering its own expenses such as power consumption, colocation fees, cross-connect fees, and other related costs. Netflix has installed OCAs in over 52 IXPs around the world, enabling a connection with any ISP.

Deployment

IX deployment Netflix deploys OCAs within IXPs located in major Netflix markets around the world. These OCAs are interconnected with ISPs present at the same location through free public or private peering.

Embedded deployment OCAs are directly installed within ISP networks. While Netflix supplies the server hardware at no cost, ISPs are responsible for providing space, power, and connectivity.

Requirements

Three primary factors that determine the number of appliances that need to be deployed are:

The network architecture requirements The maximum amount of Netflix traffic to be delivered from a particular site The availability and failover options that can be implemented at that site

Hardware Open Connect is a combination of local servers, referred to as OCAs, and additional infrastructure. Netflix has developed storage appliances that are used to store the content in many IX locations globally and are embedded at larger ISP partner locations. The storage holds up to 350 TB, therefore, if something from storage becomes popular, Netflix will move that title onto the other server called flash server which serves large traffic.

Software These are used software for designing Open Connect Appliance Software:

Operating system – FreeBSD Web server – NGINX Routing Intelligence Proxy – BIRD internet routing daemon IP support – IPv4 and IPv6 Other software handle content management and transmits information regarding the system's health and other statistics to the Open Connect supporting services at Netflix.

Benefits Open Connect permits ISPs to circumvent the expenses associated with transit charge and costly international backhaul capacity by delivering the traffic directly to the ISP instead of through a transit link. If an ISP has multiple OCAs in place, it is possible to transmit the traffic to the consumer from a server nearby, which reduces costs for the core network capacity. Open Connect assists wideband networks in retaining their customers by preventing slow speed and instability. Moreover, if one element fails, it is possible to redirect the traffic to other servers, which minimizes the risk of downtime. Netflix invests in delivery infrastructure, such as OCAs, as well as compression technology, to optimize the delivery of its content and support the growing global demand for video content and broadband internet access. The OCAs report their health values and receive their configurations from the Open Connect supporting services (if it is reachable from the Network Operations Center). Netflix also automatically incorporates feedback on the health information into its content routing decisions.

References

External links Official website

Worked examples

Example 1 — a first encounter with Open Connect

Start with the simplest possible case. Write down what Open Connect claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Open Connect before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Open Connect ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Open Connect

In research: Open Connect appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Open Connect in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Open Connect is common in secondary-school and first-year university syllabi. It links to neighbouring topics Content delivery networks, Netflix, Streaming media systems, so understanding it makes those chapters shorter.
In everyday life: Look for Open Connect outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Open Connect in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Open Connect means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Open Connect out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Open Connect in simple terms?

Why does Open Connect matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Open Connect?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Open Connect.