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Facebook Mobile Idle Chat

 
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 MessagePosté le: Mar 9 Jan - 15:49 (2018)    Sujet du message: Facebook Mobile Idle Chat Répondre en citant




Facebook Mobile Idle Chat
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Each Facebook Chat user now needs to be notified whenever one of his/her friends (a) takes an action such as sending a chat message or loads a Facebook page (if tracking idleness via a last-active timestamp) or (b) transitions between idleness states (if representing idleness as a state machine with states like "idle-for-1-minute", "idle-for-2-minutes", "idle-for-5-minutes", "idle-for-10-minutes", etc.). 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 60-some requests for regular Facebook pages. 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. 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 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.For Facebook Chat, we rolled our own subsystem for logging chat messages (in C++) as well as an epoll-driven web server (in Erlang) that holds online users' conversations in-memory and serves the long-polled HTTP requests. Learn more, including about available controls: Cookies Policy.FacebookJoin or Log Into Facebook Email or PhonePasswordForgot account?Log InDo you want to join Facebook?Sign UpSign UpFacebook ChatBy Eugene Letuchy on Tuesday, May 13, 2008 at 10:56pmOne 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. HOW WE SCOREABOUT USCONTACT USTERMSPRIVACY POLICYCOPYRIGHT POLICYAdvertiseAn error occurred. and I'm getting absolutely tired of it. Fortunately, we have Thrift. Both subsystems are clustered and partitioned for reliability and efficient failover. Is Mariah Carey a cute person? 69 answers Celebrities 2 days ago WILL A FULL SHEET FIT A TWIN BED WITH A MATTRESS TOPPER? 5 answers Decorating & Remodeling 2 days ago What is the BEST dental insurance company & plan without a long waiting period for root canals? 10 answers Dental 2 days ago HOW LONG HAS NICK SABAN BEE ALABAMAS COACH? 4 answers Football (American) 8 hours ago Do these FACTS prove that Kaepernick was blackballed by the NFL owners? The last six games played in a 49ers uniform by SF QB Jimmy Garoppolo: 67.4 completion percentage 1,565 total yards 7 TDs - 5 INTs 96.2 passer rating Last six games played in a 49ers uniform by Colin Kaepernick. My original profile was deemed as 'spam' for some odd reason. It seems to me like they're just trying to sweep this problem under the rug. There was an alternate form of verifying who you are, but that didn't work either. It is rather keeping each online user aware of the online-idle-offline states of their friends, so that conversations can begin.The naive implementation of sending a notification to all friends whenever a user comes online or goes offline has a worst case cost of O(average friendlist size * peak users * churn rate) messages/second, where churn rate is the frequency with which users come online and go offline, in events/second. .. Eugene is a Facebook Engineer Facebook EngineeringAll NotesEmbed PostEnglish (US)NederlandsFryskPolskiTrkeDeutschFranais (France)EspaolPortugus (Brasil)ItalianoSign UpLog InMessengerFacebook LiteMobileFind FriendsPeoplePagesPlacesGamesLocationsCelebritiesMarketplaceGroupsRecipesSportsLookMomentsInstagramLocalAboutCreate AdCreate PageDevelopersCareersPrivacyCookiesAd ChoicesTermsHelpSettingsActivity Log Facebook 2018. 65.1 completion percentage 1,305 total yards 9 TDs - 2 INTS 96.2 passer rating The last six games played in a 49ers uniform by SF QB Jimmy Garoppolo: 67.4 completion percentage 1,565 total yards 7 TDs - 5 INTs 96.2 passer rating Last six games played in a 49ers uniform by Colin Kaepernick. Get great tech advice delivered to your inbox.Keep your family productive, connected, entertained, and safe.Please enter a valid email. Every time I tried to post a question asking for an answer ( No vulgar, or abusive language in the post. Around The HomeEntertainmentProductivitySmart HomeFamilyParentingToysPetsTravelProduct ReviewsPhonesTabletsLaptopsDesktopsWearablesAudioCamerasHeadphonesPrintersSmart HomeTVsGaming and VideoOne Cool ThingFrugal TechKickstartersVideosTechwalla SEARCH. 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. I've tried it in bounds of 100 + times to still no avail. Real-time messaging:Another challenge is ensuring the timely delivery of the messages themselves. I couldn't. Ramping up:The secret for going from zero to seventy million users overnight is to avoid doing it all in one fell swoop. See photos and updates from friends in News Feed. This isn't by any means a new technique: it's a variation of Comet, specifically XHR long polling, and/or BOSH.Having a large-number of long-running concurrent requests makes the Apache part of the standard LAMP stack a dubious implementation choice. show more Hi there, thanks for reading. Try again later.Thanks for signing up! 2018 Leaf Group Ltd. Home Blog Meet Mari Hire Mari Speaking Events Media Contact Home Blog Meet Mari Hire Mari Speaking Events Media Contact WHOOPS! 404 It looks like you are lost! Try searching here Meet Mari Maris Blog About Mari Calendar of Events Meet Team Mari! Hire Mari Speaking Media Training Connect Connect Follow Mari Affiliates Learn Books Resources Training Copyright 2016 Mari Smith International All Rights Reserved . The results of inevitable programming bugs, hardware failures, et al., should be hidden from the user as much as possible and isolated from the rest of the system.The way this is typically 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 cache), with each short-lived request retrieving only the parts relevant to that request. 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 5a02188284
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