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One of the things I like most about working at Facebook is login facebook online chat ability to launch products that are almost immediately latin dating marriage by millions of people. Unlike a 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 go 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: Jump to. Sections of this page.

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May 13, at login facebook online chat Real-time presence notification: The most resource-intensive operation performed in a chat system is not sending messages. It is rather keeping each llogin user aware of the online-idle-offline states of their friends, so that conversations can begin.

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This is wildly inefficient to the point of being untenable, given that the average number of friends per user is measured in the hundreds, and the number of concurrent users during peak site usage is login facebook online chat the order of several millions. Surfacing connected users' 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 hookup sites like pof the messages themselves.

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The method we chose to get text from one user to another involves loading an iframe on each Facebook page, and having that iframe's Javascript make an HTTP GET request over a persistent connection that doesn't return until the server has data for the client. The login facebook online chat gets reestablished if it's interrupted or times. This isn't by any means a new technique: Having a large-number of long-running login facebook online chat requests makes the A pache part of the standard LAMP stack a dubious implementation choice.

Even without accounting for the sizeable 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 adult sex only requests for regular Facebook pages.

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

Distribution, Isolation, and Failover: Fault tolerance is a desirable characteristic of any big system: The results of inevitable programming bugs, hardware failures, et al.

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Login facebook online chat way this is typically accomplished in a web application is by separating the model and the faceboook 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.

While this architecture works pretty well in general, it isn't as login facebook online chat 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.

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

Chat online now, Mapusa, India. K likes. Yoga Pilates. The most resource-intensive operation performed in a chat system is not sending messages. It is rather keeping each online user aware of the online-idle-offline. A simple way to text, video chat and plan things all in one place. Sign In. Keep me signed in. Forgot your password? So many ways to connect with all your.

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" login facebook online chat 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 olgin downside: Fortunately, we have Thrift.

Thrift translates a login facebook online chat description 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. Commitment for submission? going open source a year ago we login facebook online chat the gall to release it on April Fool's Day,the Thrift project has steadily grown and improved with multiple iterations on the Erlang binding.

Having Thrift available freed us to split caht the problem of building a chat system and use the best available tool to approach each sub-problem. Ramping up: The secret for going from zero to seventy million users overnight is login facebook online chat avoid doing it all in one fell swoop. We chose to simulate the impact of many real users hitting many machines by lofin of a "dark launch" period in which Facebook pages would make connections to the chat servers, query for presence information and simulate message sends without a single UI element drawn on the page.

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

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