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contents move to sidebar hide top 1 scale 2 architecture 3 use 4 security 5 references 6 sources toggle the table of contents piper source control system add languages add links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia version control system by google piper is a centralized version control system used by google for its internal software development originally designed for linux it has supported microsoft windows and macos since october 2012 1 scale edit since its founding years google has used a central codebase 2 for over 10 years google relied on a single perforce instance using proprietary caching for scalability 3 the need for further scaling led to the development of piper 4 currently google s version control is an extreme case 5 as of 2016 update the repository was storing 86 terabytes of data comprising two billion lines of code in nine million files two orders of magnitude more than in the linux kernel repository 25 000 developers contributed 16 000 changes daily with an additional 24 000 commit operations by bots read requests each day are measured in billions 6 architecture edit piper uses regular google cloud storage solutions originally bigtable and later spanner distributed across 10 data centers worldwide and replicated through the paxos protocol 3 use edit when using piper developers apply changes to a local copy of files similar to a working copy in subversion local clone in git or a client in perforce updates made by other developers can be pulled from the central repository and merged into the local code commits are only allowed after a code review via the critique tool 7 8 typical use involves clients in the cloud citc this system utilizes cloud backend and a local fuse filesystem to create an illusion of changes overlaid on top of a full repository this approach enables seamless browsing and use of standard unix tools without explicit synchronization operations thus keeping the local copy very small average size of a local copy is less than ten files all file writes are mapped to snapshots thus permitting restoration of the previous states of the code without explicit snapshotting due to its always connected operation citc allows easy switching of computers as well as sharing modified code with other developers and use of the automated build system and testing tools 7 as a result the majority of google developers practices trunk based development with no personal branches the branches are mostly used for releases 9 security edit most of the codebase is visible to all developers sensitive individual files less than 1 as of 2016 are access controlled all operations with piper are logged accidentally committed files can be purged 7 references edit potvin levenberg 2016 p 79 potvin levenberg 2016 p 78 1 2 potvin levenberg 2016 p 80 potvin levenberg 2016 pp 80 81 blank edelman 2018 p 329 potvin levenberg 2016 pp 78 79 1 2 3 potvin levenberg 2016 p 81 sadowski kurnia rohlfs 2020 potvin levenberg 2016 p 82 sources edit blank edelman d n 2018 seeking sre conversations about running production systems at scale o reilly media isbn 978 1 4919 7881 8 retrieved 2024 10 31 potvin rachel levenberg josh 2016 06 24 why google stores billions of lines of code in a single repository communications of the acm 59 7 association for computing machinery acm 78 87 doi 10 1145 2854146 issn 0001 0782 sadowski caitlin kurnia ilham rohlfs ben 2020 02 28 critique google s code review tool in winters titus manshreck tom wright hyrum eds software engineering at google lessons learned from programming over time o reilly media inc isbn 978 1 4920 8276 7 retrieved 2025 07 21 v t e google a subsidiary of alphabet company divisions ai area 120 atap brain china cloud platform energy google org crisis response registry subsidiaries active deepmind fitbit ita software jigsaw looker mandiant security operations owlchemy labs defunct actifio adscape akwan information technologies anvato apigee bandpage bitium bufferbox crashlytics dodgeball doubleclick dropcam endoxon flutter global ip solutions green throttle games greenborder gridcentric imageamerica impermium invite media kaltix marratech meebo metaweb neotonic software neverware nik software orbitera pyra labs quest visual reqwireless rightsflow sidewalk labs slicklogin titan aerospace typhoon studios urban engines vicarious viewdle wavii wildfire interactive youtube next lab and audience development group programs business groups computing university initiative contact lens content id crosscheck data liberation front data transfer project developer expert digikavach digipivot digital garage digital news initiative digital unlocked dragonfly founders award free zone get your business online google for education google for health google for startups living stories made with code news lab powermeter privacy sandbox project nightingale project nimbus project sunroof project zero quantum artificial intelligence lab rechargeit sensorvault silicon initiative solve for x street view trusted student ambassador program vevo youtube brandconnect youtube creator awards youtube select youtube original channel initiative year in search youtube rewind 2018 2019 events alphago versus fan hui alphago versus lee sedol alphago versus ke jie android developer challenge android developer day android developer lab cnn youtube presidential debates code in code jam developer day developers live doodle4google future of go summit g day hash code i o lunar x prize mapathon science fair summer of code world chess championship 2024 youtube awards youtube comedy week youtube live youtube music awards 2013 2015 youtube space lab youtube symphony orchestra infrastructure 111 eighth avenue android lawn statues androidland barges binoculars building central saint giles chelsea market chrome zone data centers geoeye 1 googleplex ivanpah solar power facility james r thompson center king s cross mayfield mall pier 57 sidewalk toronto st john s terminal submarine cables dunant grace hopper unity wifi youtube space youtube theater people current krishna bharat sergey brin co founder john doerr john l hennessy urs hölzle salar kamangar ray kurzweil neal mohan rick osterloh larry page co founder sundar pichai ceo ruth porat cio ram shriram former andy bechtolsheim vint cerf david cheriton matt cutts jeff dean david drummond alan eustace timnit gebru sanjay ghemawat al gore omid kordestani ann mather alan mulally paul otellini patrick pichette eric schmidt rajen sheth amit singhal shirley m tilghman hal varian rachel whetstone susan wojcicki criticism general censorship degoogle fairsearch google s ideological echo chamber no tech for apartheid privacy concerns street view youtube trade unions alphabet workers union youtube copyright issues incidents backdoor advertisement controversy blocking of youtube videos in germany data breach elsagate fantastic adventures scandal kohistan video case reactions to innocence of muslims san francisco tech bus protests services outages slovenian government incident walkouts 2018 youtube headquarters shooting other android apps april fools day jokes doodles doodle champion island games magic cat academy pac man easter eggs history gmail search youtube logo material design mergers and acquisitions development software a c accelerated linear algebra amp actions on google alts american fuzzy lop android cloud to device messaging android debug bridge android ndk android runtime android sdk android studio angular angularjs antigravity apache beam apis app engine app inventor app maker app runtime for chrome apps script appsheet arcore base bazel beyondcorp bigtable bigquery bionic blockly borg caja cameyo chart api charts chrome frame chromium blink closure tools cloud connect cloud dataflow cloud datastore cloud messaging cloud shell cloud storage code search compute engine cpplint d n dalvik data protocol data studio dialogflow exposure notification fast pair fastboot federated learning of cohorts file system firebase firebase studio firebase cloud messaging flatbuffers flutter freebase gadgets ganeti gears gerrit glop grpc gson guava guetzli guice gvisor gyp jax jetpack compose keyhole markup language kubernetes kythe leveldb lighthouse lmctfy mapreduce mashup editor matter mobile services namebench native client neatx neural machine translation nomulus o z open location code openrefine opensocial optimize or tools pack pagespeed piper plugin for eclipse polymer programmable search engine project shield public dns recaptcha renderscript safetynet sagetv schema org search console shell sitemaps skia graphics engine spanner sputnik stackdriver swiffy tango tensorflow tesseract test translator toolkit urchin utm parameters v8 virustotal visbug wave federation protocol weave web accelerator web designer web server web toolkit webdriver torso webrtc android major cupcake donut eclair froyo gingerbread honeycomb ice cream sandwich jelly bean kitkat lollipop marshmallow nougat oreo pie 10 11 12 13 14 15 16 version history smartphones automotive go devices things tv devices xr operating system chromeos chromeos flex chromiumos fuchsia glass os google tv glinux goobuntu wear os ml model bert chinchilla dreambooth gemini gemini robotics gemma imagen 2023 lamda palm t5 veo text to video model videopoet xlnet neural network efficientnet gato inception mobilenet transformer wavenet program alphadev alphafold alphageometry alphago alphago zero alphastar alphazero master muzero format codec aab apk av1 ilbc isac libvpx lyra protocol buffers ultra hdr vp3 vp6 vp8 vp9 webm webp woff2 languages carbon dart go sawzall search algorithm googlebot hummingbird mobilegeddon pagerank matrix panda penguin pigeon rankbrain domain name app dev google zip g co google by typeface croscore noto product sans roboto software search ai overviews knowledge graph safesearch scholar shopping images books ngram viewer ads ad manager admob ads adsense analytics chrome apps dinosaur game experiments remote desktop web store web gmail translate calendar docs sheets slides gemini workspace marketplace nano banana google fonts earth maps street view tenor safe browsing sites account dashboard takeout android android auto meet messages news play books games pass services waze gboard photos pay wallet pixel camera lens assistant authenticator classroom youtube kids music premium shorts studio tv vr other kaggle notebooklm input tools japanese fi wireless widevine hardware pixel phones pixel 2 3 3a 4 4a 5 5a 6 6a 7 7a fold 8 8a 9 pro fold 9a 10 pro fold 11 pro pro fold watch 2 3 4 tablets c slate tablet laptops chromebook pixelbook go buds nexus phones one s galaxy 4 5 6 5x 6p tablets 7 2012 10 7 2013 9 q player other consumer cardboard chromebook chromebox chromecast fitbit project iris nest smart speakers thermostat wifi play edition android one chromebit clips daydream liftware onhub enterprise glass sycamore processor tensor tensor processing unit titan security key android dev phone liquid galaxy project ara pixel visual core search appliance v t e litigation advertising feldman v google inc 2007 rescuecom corp v google inc 2009 goddard v google inc 2009 rosetta stone ltd v google inc 2012 google inc v american blind wallpaper factory inc 2017 jedi blue antitrust european union 2010 present united states v adobe systems inc apple inc google inc intel corporation intuit inc and pixar 2011 umar javeed sukarma thapar aaqib javeed vs google llc and ors 2019 united states v google llc 2020 epic games v google 2021 united states v google llc 2023 intellectual property perfect 10 inc v amazon com inc 2007 viacom international inc v youtube inc 2010 lenz v universal music corp 2015 authors guild inc v google inc 2015 field v google inc 2016 google llc v oracle america inc 2021 smartphone patent wars privacy rocky mountain bank v google inc 2009 hibnick v google inc 2010 united states v google inc 2012 judgement of the german federal court of justice on google s autocomplete function 2013 joffe v google inc 2013 mosley v sarl google 2013 google spain v aepd and mario costeja gonzález 2014 frank v gaos 2019 other garcia v google inc 2015 google llc v defteros 2020 gonzalez v google llc 2022 related concepts beauty youtuber booktube breadtube don t be evil gayglers google as a verb google bombing 2004 u s presidential election google effect googlefight google hacking googleshare google tax googlewhack googlization illegal flower tribute objectives and key results rooting search engine manipulation effect side project time sitelink site reliability engineering studytube vtuber youtube poop youtuber list products android booting process custom distributions features recovery mode software development street view coverage africa antarctica asia israel europe north america canada united states oceania south america argentina chile colombia youtube copyright strike education features moderation most disliked videos most liked videos most subscribed channels most viewed channels most viewed videos official channel social impact youtube premium original programming other gmail interface maps pin most downloaded google play applications stadia games documentaries alphago google behind the screen google maps road trip google and the world brain the creepy line books google hacks the google story googled the end of the world as we know it how google works i m feeling lucky in the plex the maniac popular culture google feud google me film google me kim zolciak song google me teyana taylor song is google making us stupid proceratium google matt nathanson live at google the billion dollar code the internship where on google earth is carmen sandiego other attention is all you need elgoog generative pre trained transformer me at the zoo predictions of the end relationship with wikipedia reunion italics denote discontinued products category outline this google related article is a stub you can help wikipedia by adding missing information v t e retrieved from https en wikipedia org w index php title piper_ source_control_system oldid 1341156342 categories version control systems google software google stubs hidden categories articles with short description short description matches wikidata articles containing potentially dated statements from 2016 all articles containing potentially dated statements all stub articles this page was last edited on 1 march 2026 at 19 41 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree to the terms of use and privacy policy 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