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May 13, at PM Public One of the things I like most about working at Facebook is the ability to launch products that are almost immediately used by millions of people.

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Unlike Ordos woman Ordos three-guys-in-a-garage startup, we don't have the luxury of scaling out infrastructure to keep pace with user growth; when your feature's userbase will Women seeking casual sex Home Alabama from 0 to 70 million practically overnight, scalability has to be baked in from the start.

The project I'm currently working on, Facebook Chat, offered a nice set of software engineering challenges: Real-time presence notification: The most resource-intensive operation performed in a chat system is not sending messages.

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It is rather keeping each online user aware of the online-idle-offline states of their friends, so that conversations can begin. This is wildly inefficient to the point of being untenable, given that the average of friends per user is measured in the hundreds, and the of concurrent users during peak site usage is on the order of several millions. Surfacing connected Do you need economic wanna fuck idleness greatly enhances the chat user experience but further compounds the problem of keeping presence information up-to-date.

Real-time messaging: Another challenge is ensuring the timely delivery Mature sex cinema the messages themselves. The request gets reestablished if it's interrupted or times.

lets chat virtual support groups the Ehlers-Danlos Society has set up additional virtual 1-hour events to provide a Dates, Times and Zoom Link Details Sunday, April 26, pm EDT (US and Canada) / Midnight BST. Facebook raises its Zoom game, lets Messenger Rooms chats broadcast to link up that Rooms chat to Live, the feature in Facebook that lets. Link up = meet up. Hannah: omg I miss u so much we definitely need to link up soon! to call someone, let someone know what's going on Link UP The.

Having a large- of long-running concurrent requests makes the Apache part of the standard LAMP stack a dubious implementation choice. Even without ing for the Longmeadow MA sexy women overhead of spawning an OS process that, on average, twiddles its thumbs for a minute before reporting that no one has sent the user a message, the waiting time could be spent servicing some requests for regular Facebook s.

The result of running out of Apache processes over the entire Facebook web tier is not pretty, nor is the dynamic configuration of the Apache process limits enjoyable.

Distribution, Isolation, and Failover: Seward NE housewives personals tolerance is a desirable characteristic of any big system: if an error happens, the system should try its best to recover without human intervention before giving up and informing the user.

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The of inevitable programming bugs, hardware failures, et al. The way this is Red shirt Aberdeen South Dakota sexxxx sushi accomplished in a web application is by separating the model and the view: data is persisted in a database perhaps with a separate in-memory cachewith each short-lived request retrieving only the parts relevant to that request.

Because the data is persisted, a failed read request can be re-attempted. Cache misses and database failure can be detected by the non-database layers and either reported to the user or worked around using replication.

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While this architecture works pretty well in general, it isn't as successful in a chat application due to the high volume of long-lived requests, the non-relational nature of the data involved, and the statefulness of each request. Both subsystems are clustered and partitioned for reliability and efficient failover.

Why Erlang? In short, because the problem domain fits Erlang like a glove.

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Erlang is a functional concurrency-oriented language with extremely low-weight user-space "processes", share-nothing message-passing semantics, built-in distribution, and a "crash and recover" philosophy proven by two decades of deployment on large soft-realtime production systems. Glueing with Thrift: Despite those advantages, using Erlang for a component of Facebook Chat had a downside: that component needed to communicate with the other parts of Sexy horny women classified.

Fortunately, we have Thrift. Thrift translates a service Laveen nasty girls. Swinging. into the RPC glue code necessary for making cross-language calls marshalling arguments and responses over the wire and has templates for servers and clients.

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Since going open source a year ago we had the gall to release it on April Fool's Day,Mature fucks gents Thrift project has steadily grown and improved with multiple iterations on the Erlang binding. Having Thrift available freed us to split up the problem of building a chat system and use the best available tool to approach each sub-problem.

Ramping Beautiful couples looking friendship New Mexico The secret for going from mackay nude models to seventy million users overnight is to avoid doing it all in one fell swoop. We chose to simulate the impact of many real users hitting many machines by means of a "dark launch" period in which Facebook s would make connections to the chat servers, query for presence information and simulate message sends without a single UI element drawn on the.

With the "dark launch" bugs fixed, we hope that you enjoy Facebook Chat now naughty detroit michigan bitches the UI lights have been turned on. Eugene is a Facebook Engineer.