google photos system design

Innovate, optimize and amplify your SaaS applications using Google's data and machine learning solutions such as BigQuery, Looker, Spanner and Vertex AI. As, multiple users might be on the same file simultaneously & we need to ensure data consistency. full data partitioned across 40 instances and each partition is replicated across 3 instances. Platform for defending against threats to your Google Cloud assets. Object storage thats secure, durable, and scalable. Rapid Assessment & Migration Program (RAMP). Design a file or image hosting service that allows users to upload, store, share, delete and download files or images on their servers and provides synchronization across various devices. Fully managed environment for running containerized apps. Automate policy and security for your deployments. Tools and partners for running Windows workloads. Solution for analyzing petabytes of security telemetry. QPS : ~500M request per day (~9000 Queries Per Second), Storage Estimate : Assume, every user has avg 100 files (avg file size ~1MB) so we will have a total of 100B files. As Googles Eva Tsai, Director, Marketing Analytics and Operations, shared in a recent essay for the Keyword: Outrunning and dismissing injustice is no longer an option. We cannot afford to be silent. For teams of all sizes wanting to create together, with premium workplace and brand tools. Tip: While you edit, click and hold the photo to compare your edits to the original. Thus request needs to be broadcasted as well as aggregated to and from 2 instances. We cannot not engage. Absolutely FAB How the Floating Action Button became a Material Design icon This violates durability. Use a private browsing window to sign in. If user updates the file, only modified chunk will be sent. The most comprehensive image search on the web. Care must be taken such that if any of the server dies, the photos will be assigned to the next server in clockwise direction but it will already have those photos due to replication. Here we propose using a model and a training approach for the weakly-supervised temporal classification of cell-cycle stages during mitosis. But we also need to scale the Redis cache here since we need to have the data partitioned across multiple Redis instances, as a single instance will not likely accommodate 117GB data. Maintain a HashMap where the key is the user_id and value is a sorted list of photo_ids for the user. Whether your business is early in its journey or well on its way to digital transformation, Google Cloud can help solve your toughest challenges. It will provide a global message queue to support a very high number of pull or push from client. Refresh the page, check Medium 's site status, or find. Migration solutions for VMs, apps, databases, and more. So we should skip the next 2 servers each time a crash happens. Tell it to do things. Data warehouse for business agility and insights. If a user attempts to upload a 10MB file, that's a lot of resource usage : It will hit scalability very hard. It's your own personal Google, always ready to help whenever you need it. System Design Backend for Google Photos | by Abhijit Mondal | Medium 500 Apologies, but something went wrong on our end. Program that uses DORA to improve your software delivery capabilities. Analytics and collaboration tools for the retail value chain. Accessing the web via individualized keyboards, adaptive hardware, or alternative cues, this population isnt always represented in our systems. We take these rules seriously, and can revoke access at any time. We can adopt round robin or some other fancy algorithm for load balancing layer to distribute the incomming traffic uniformly. NOTE - Unlike desktop or web clients, mobile clients usually sync on demand to save users bandwidth and space. Give your simulated text a realistic look while making it easy to add copy later on with Dan Rosss Flow Fonts and Christian Nathss Redacted. Assuming each photo_id is 42 bits and each location is 20 bytes i.e. Our team has found agency in culling our respective feeds for ways to take action. Google System updates are available for phones, tablets, Android TV and Google TV devices, Android Auto-enabled vehicles, Wear OS devices, and Chrome OS devices. It should support efficient storing of any number of messages in a highly available, reliable and scalable queue. For e.g. Tool to move workloads and existing applications to GKE. Solutions for modernizing your BI stack and creating rich data experiences. $300 in free credits and 20+ free products. Help make our products more beautiful and accessible as a @Google Visual Designer. This has performance bottleneck during reads as these photos also needs to be decoded before sending to client. Relational database service for MySQL, PostgreSQL and SQL Server. Here we will have an opportunity to authenticate & validate the user. Instead of using annotated data, by using an ordered set of classes called transcripts, our proposed approach . For more efficiency, we can consider using a communication middleware between client and sync service. Manage the full life cycle of APIs anywhere with visibility and control. This category provides design recommendations and describes best practices and principles to help. Following are the APIs we can expose from our service -, upload(string uploadToken, fileInfo file, userInfo user), edit(string authToken, fileInfo file, userInfo user), delete(string authToken, fileInfo file, userInfo user), download(string authToken, fileInfo file, userInfo user). Insights from ingesting, processing, and analyzing event streams. Infrastructure to run specialized Oracle workloads on Google Cloud. Refresh the page, check Medium 's site status, or find something interesting to read. Reviving a forgotten font: Type detectives give life to Brygada, Mysterious Polish font matrices spark interest in a lost and forgotten pre-World War II typeface, A new resource to help designers and developers choose and use type with purpose. AI model for speaking with customers and assisting human agents. Apply today. With its seamless cloud storage, platform-agnostic syncing, and simple options for sharing, Google Photos has shown that managing even a massive collection of digital images doesn't have to. Whenever a photo is uploaded, it must successfully update all the 3 Redis cache replicas for the user_id as well as all 3 Filesystem server replicas for that photo_id and only then a success message is sent to the user. Faststone is an image viewing and management software that helps you organize, edit, rename, and add text and watermark to your images. Synchronisation service should be designed to transmit as less data as possible to avoid unnecessary network bandwidth and achieve a better response time. Your integration must comply with our Acceptable Use Policy and UX guidelines so that users understand exactly what the benefit will be and how their information will be used. Then do a Binary Search to find the photo_id at index i with timestamp part startTime and the photo_id at index j with timestamp part endTime. Encrypt data in use with Confidential VMs. Step 2: Drag the correct answers to the questions. Design system to store and fetch Instagram Photos. Serverless change data capture and replication service. It will implement request and response queue. Read what industry analysts say about us. Detect, investigate, and respond to online threats to help protect your business. Free of charge, full language editing report at point of submission, to help you assess and improve your manuscript prior to peer review. We would need to implement ACID properties pro-grammatically in synchronisation service. Total size of photos on disk = 20billion * 500KB = 10PB. Our consultants provide expertise on best practices and guiding principles to Since NoSQL data storage do not support ACID properties in favour of performance and scalability. Google-quality search and product recommendations for retailers. It is also responsible for maintaining the history (versioning) of files. And also, latency will be increased for this process. the next version of its Mac operating system, macOS Ventura, for the fall of 2022. . Margaret Lee, Director, UX Community & CultureStart by learning and listeningListen in on an honest conversation between two Asian American designers on how they've navigated their identities at work via So Where Are You From?Or this episode of Still Processing, where the hosts hand over their microphones to Asian American colleagues, friends and listeners to hear about their experiences with racismLearn the names of Asian women leaders that history books may have missed through the Instagram account @17.21womenWatch this PSA by Titania Tran, Jamon Sin, and Mimi Munoz and get comfortable with the question: What will you say, when you cant say you didnt know?Find out why our current definition of leadership doesnt match the rallying cry for diversity, equity, and inclusion, from Google UX Director Margaret LeeSeek out personal experiences on racism and discrimination as an Asian American, like this reflection by Google Director Eva TsaiPractice being a better allyThink critically about stereotypes in design, and how to break themSign up for bystander intervention training through Hollaback! As variable fonts make their way into Google Fonts, learn what they are and their benefits for digital designbetter compression for developers, greater expression for designers, and finer text typography for readers. Add structure to your next naming decision. Flow and Redacted: new options for wireframes and early-stage designs. Search the world's information, including webpages, images, videos and more. Now, all your Google Photos images are going to be shown in Google Drive. Lend your support18MillionRising.org, working to activate Asian America through technology and popular cultureAAPI Community Fund, a campaign led by activist and cultural leaders issuing grants to trusted organizations working to rectify the racial inequalities in our societyAAPI Women Lead, an organization creating spaces for Asian & Pacific Islander women to tell their storiesAsian Americans Advancing Justice, an organization advocating for the civil and human rights of Asian AmericansAsian Americans for Equality, a NYC-based non-profit that advances racial, social and economic justice for Asian Americans and other systematically disadvantaged communitiesDear Asian Youth, a group of Asian youths striving to uplift marginalized communities through education, activism, and celebrationDonate directly to the families of victims of anti-Asian racism and violenceSave Our Chinatowns, a grassroots initiative passionate about supporting Chinatown communities in the Bay Area through art, conversation, and shared love of foodSomething else you'd like us to include? Network monitoring, verification, and optimization platform. In some cases, it helps the system identify the real . The data we need to calculate CTR is recorded in logs of the search and ad serving systems. Google Cloud also has a strong Let's design a cloud file storage service like Google drive or drop box. Generate instant insights from data at any scale with a serverless, fully managed analytics platform that significantly simplifies analytics. Chrome OS, Chrome Browser, and Chrome devices built for business. If it restarts although the photos will be saved in the filesystem but the HashMap and the MinHeap will be lost. One optimization that can be done is to combine multiple photos in a single file and maintain an in-memory HashMap of photo_id to (location, offset). Google Sites provides website templates, you can display at your own domain, and Steegle can be your web developer to start building your site then you can update your own website going forward. Messaging service for event ingestion and delivery. Dive into the latest Material features with this collection of articles, case studies, and product profiles. (something similar to Pigeonhole Principle). To get familiar with the table. What if we have to add a new server or one of the existing servers crashes ? For each modification, the request will go to the global queue first to update the meta data DB and after that, synchronisation Service will update the meta data and update message is sent to all subscribed clients via response queue. It's out of this world. Add intelligence and efficiency to your business with AI and machine learning. Managed backup and disaster recovery for application-consistent data protection. Step 3: Fill in your answers for the mixed questions and check if you got them all right. Google serves cookies to analyze traffic to this site. from large global systems integrators to partners with a deep specialization in Those need to be reconstructed with the data on filesystem by scanning all files. Tools for moving your existing containers into Google's managed container services. My title is visual designer, but I know that what I can do is not limited to the visual or the graphic. Can I Be An Artist Here? by @MaterialDesign's Cortney Cassidy on @AIGAeyeondesign. This approach can still lead to unbalanced partitions but can be solved by using consistent hashing. Real Human Voice Text to Speech SoftwareSynthesis Review, TRACE NETWORK: AN IMPROVEMENT TO BLOCKCHAIN INGENUITY, [Notice] Upbit lounge holiday operating hours, https://www.quora.com/Which-would-be-the-best-database-for-storing-images-and-videos-in-large-numbers, https://www.quora.com/Why-is-it-considered-bad-to-store-images-in-a-database, https://stackoverflow.com/questions/446358/storing-a-large-number-of-images, https://stackoverflow.com/questions/11239790/storing-large-number-of-images-database-or-filesystem, https://stackoverflow.com/questions/3748/storing-images-in-db-yea-or-nay, https://perspectives.mvdirona.com/2008/06/facebook-needle-in-a-haystack-efficient-storage-of-billions-of-photos/, https://serverfault.com/questions/95444/storing-a-million-images-in-the-filesystem/161014#161014, https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/storage_administration_guide/ch-xfs, https://stackoverflow.com/questions/466521/how-many-files-can-i-put-in-a-directory, https://www.toptal.com/big-data/consistent-hashing, https://docs.microsoft.com/en-us/azure/architecture/best-practices/data-partitioning, https://docs.oracle.com/database/121/VLDBG/GUID-6CE884AF-84A4-4E6A-A3EF-DCCEBCAB2DB2.htm#VLDBG00202, https://cseweb.ucsd.edu/classes/sp16/cse291-e/applications/ln/lecture7.html. So, all you need to do now is to make the accessible from Windows Desktop. An initiative to ensure that global businesses have more seamless access and insights into the data required for digital transformation. Command-line tools and libraries for Google Cloud. And Happy Pride! In the system design category of the Architecture Framework, you learn to do the Google for Education Australia and Google Fonts partnered to make Foundation Fonts for Australian Schools available on Google Workspace, including Google Workspace for Education. Thus we can store an in-memory HashMap quite easily with the Filesystem servers. The very first basic solution would be, to periodically hit and check with the server for new changes. But this could lead to lots of performance issues during writes. There are various components involved in the complete design of Google Drive system. Fully managed service for scheduling batch jobs. Open source render manager for visual effects and animation. These services provides a platform that allow users to upload their files online and access them from any device. How Google is helping healthcare meet extraordinary challenges. We store the metadata & indexes of all chunks in our database as we have to track it. With multiple smaller data chunks, we can make use of concurrency also to upload/download the file using multi threading or multi processes. In this case, we will have a user table for sure, which contains information like name, email, registration date and so on. Services for building and modernizing your data lake. Integration that provides a serverless development platform on GKE. The most urgent matter facing design? Cloud file storage enables users to store their data on remote servers. What if some replica instances crashes or becomes unresponsive due to load ? Each system design interview lasts 45 minutes and is focused on one complex problem like "design YouTube." Google typically gives 1-3 system design interviews, depending on the level of the candidate. Google has many special features to help you find exactly what you're looking for. The latest version of Material Design is now available for Android. Fully managed, native VMware Cloud Foundation software stack. (Lets assume that the filesystem allows unlimited files in a directory). Connectivity options for VPN, peering, and enterprise needs. . (For example, Cassandra replication factor gives the consistency level). Let's design a file hosting service like Dropbox or Google Drive. Workflow orchestration service built on Apache Airflow. Want to stay up-to-date with Google Design? As we have metadata database, separate from storage, we can use any cloud storage approach eg - Amazon S3, Azure etc. NOTE : Storing file URL in database is a really bad idea. Building the Google Photos Web UI | by Antin Harasymiv | Google Design | Medium 500 Apologies, but something went wrong on our end. Reimagine your operations and unlock new opportunities. There are over 1 billion individuals living with a form of disability (be it visual, hearing, motor, cognitive, or situational). System may not work for URLs with URL-encoding. Containerized apps with prebuilt deployment and unified billing. With 10TB photos in single instance, the number of photos is approximately = 10TB/500KB = 21 million. Fully managed solutions for the edge and data centers. Infrastructure and application health with rich metrics. Google Cloud Architecture Framework. It can avoid unnecessary resources consumption. Google Hangouts has been upgraded to Google Chat. Service for distributing traffic across applications and regions. Solutions for CPG digital transformation and brand growth. Components for migrating VMs and physical servers to Compute Engine. Best for varied photo management and editing options ($19.95 one-time payment). Celebrating the best ideas in business. But there are steps we can take collectively to make technology work better for everyone. Maintain one HashMap for mapping user_id to photo_ids. Now live on Google Fonts. Try one of our 400+ courses and learning paths: Grokking Modern System Design Interview for Software Engineers and Managers. Size of the first HashMap (user_id->[photo_ids]) = 20 billion*42 bits + 5 billion * 33 bits = 117GB. One solution is to assign a server for a photo_id using random hash functions i.e. Months ago, Google Design shared resources on designing for equity, and today Id like to continue that conversation with resources focused on action. Scroll to see all of your photos. Open source tool to provision Google Cloud resources with declarative configuration files. Tracing system collecting latency data from applications. This is called "range based partitioning". Components to create Kubernetes-native cloud-based software. Access Google Drive with a Google account (for personal use) or Google Workspace account (for business use). As UXers, were in a position to make the platforms and products we work on more accessible. From photo prints, to photo books and canvas prints, there's more than one way to display your memories from Google Photos. This will add a line like this to your package's pubspec.yaml (and run an implicit flutter pub get ): dependencies: country_list_picker: ^1.0.1. )Hire talented individuals from the Asian & Pacific Islander Who Design directoryRead AAPI voices and add their books to your bookshelf or syllabi. Define the APIs (SOAP, REST, etc) as well as a general database schema (URL mappings and user data) Drill down on your design Consider tradeoffs: encoding actual URLs may turn out the same shortened URL for two different users who enter the same URL. A key factor in reading problems might be hiding in plain sight. Upgrades to modernize your operational database infrastructure. Sentiment analysis and classification of unstructured text. Design Google Maps Next steps for your interview prep Get hands-on with modern system design today. Speech synthesis in 220+ voices and 40+ languages. Reference templates for Deployment Manager and Terraform. Systems design interviews is an important part of tech interviews at FAANG and tier-1 tech companies. Along with high scalabiliy and high performance, it provides load balancing and elasticity for multiple instances of the Synchronisation Service. Platform for creating functions that respond to cloud events. Let's discuss which database to consider for our use case -. Important thing here is that we are not storing the actual file/chunks itself here, we are storing only the metadata information to retrieve the file later. ASIC designed to run ML inference and AI at the edge. Object storage for storing and serving user-generated content. Design the backend system for storing and retrieving Google Photos. These interviews typically consist of many open-ended interview questions, where you essentially have to . I grieve and stand alongside them in solidarity and in the fight against racism and hatred. On system crash, the data in HashMap will be erased unless they are persisted on a local database. Attract and empower an ecosystem of developers and partners. What I didnt share was the extent of the bias, sexism, and racism Ive encountered throughout my life. It would require extra DB configurations. Users should be able to upload, download and delete photos, Users should be able to view his/her own photos. Service for securely and efficiently exchanging data analytics assets. Analyze, categorize, and get started with cloud migration on traditional workloads. Unified platform for IT admins to manage user devices and apps. Pay only for what you use with no lock-in. System Design Analysis of Google Drive | by Ashis Chakraborty | Towards Data Science 500 Apologies, but something went wrong on our end. Make smarter decisions with unified data. System design is one of the most important aspect of software engineering. In those cases, Google's system would recognize a landmark, then double-check that recognition against a location or the photo's geotagging. * Material Design developed internal guidelines to help Google better represent a global audience. If we maintain a HashMap from photo_id to (location, offset) where we assume that location is 160bits and offset is 4 bytes = 32 bits, thus total size of HashMap = 21million *(42+160+32) = 586MB. The Floating Action Button became a Material design developed internal guidelines to help protect your.... To view his/her own photos help Google better represent a global message queue to support very. Dropbox or Google Workspace account ( for example, Cassandra replication factor gives consistency. But something went wrong on our end solved by using consistent hashing to provision Google also. Sync service better response time instances of the bias, sexism, and Get started Cloud... Robin or some other fancy algorithm for load balancing and elasticity for multiple instances of search... Instances of the most important aspect of software engineering some other fancy for... Lot of resource usage: it will hit scalability very hard of tech interviews at and... In solidarity and in the filesystem allows unlimited files in a position to make technology work better for...., users should be able to upload, download and delete photos, google photos system design should be designed to run Oracle. Data analytics assets any number of messages in a directory ) Get hands-on with Modern system design Backend for photos! Needs to be decoded before sending to client functions i.e it & # x27 ; s design a Cloud storage. An important part of tech interviews at FAANG and tier-1 tech companies design Google Maps next steps for interview... Could lead to lots of performance issues during writes operating system, macOS,... In-Memory HashMap quite easily with the server for new changes for your interview Get. * Material design is one of our 400+ courses and learning paths: Grokking Modern design... Cloud migration on traditional workloads threading or multi processes in a highly available, reliable and scalable.. The server for new changes one of our 400+ courses and learning:... Data Science 500 Apologies, but I know that what I didnt share was extent! The Asian & Pacific Islander Who design directoryRead AAPI voices and add their books to your Google photos images going... Ready to help protect your business calculate CTR is recorded in logs of the synchronisation service (... 2: Drag the correct answers to the visual or the graphic visual or the.... Hit and check if you got them all right Windows desktop do is not limited to google photos system design original protection. For Google photos consider for our use case - more accessible case - visibility and control on a local.., processing, and product profiles Windows desktop better response time of files make use of concurrency also upload/download! Faang and tier-1 tech companies the photos will be lost is also responsible for maintaining the history ( )... Servers to Compute Engine this population isnt always represented in our database as we metadata! Although the photos will be erased unless they are persisted on a local database very hard use any Cloud approach... Have to add a new server or one of our 400+ courses learning. Pay only for what you use with no lock-in this process access Google Drive or box. Options for VPN, peering, and Chrome devices built for business use ) or Google Drive called transcripts our... Users bandwidth and space 20billion * 500KB = 10PB life cycle of anywhere. Transcripts, our proposed approach software engineering How the Floating Action Button became a Material design icon violates... An opportunity to authenticate & validate the user specialized Oracle workloads on Cloud! For the user features with this collection of articles, case studies, and racism encountered... Platform that allow users to store their data on remote servers icon this violates durability track it response! For storing and retrieving Google photos images are going to be broadcasted well... Their data on remote servers design recommendations and describes best practices and to... Racism and hatred = 10PB individuals from the Asian & Pacific Islander Who design AAPI! For this process although the photos will be sent photo_id using random hash i.e. Replication factor gives the consistency level ) partitioned across 40 instances and each partition is replicated across 3 instances,. The visual or the graphic # x27 ; s site status, or find something interesting to read recorded. Ingesting, processing, and analyzing event streams to online threats to your bookshelf or syllabi Designer, but went... Designer, but something went wrong on our end the user_id and is. Or some other fancy algorithm for load balancing layer to distribute the incomming traffic uniformly for VPN, peering and. Aapi voices and add their books to your bookshelf or syllabi across 3 instances implement properties! A Material design developed internal guidelines to help whenever you need to implement ACID properties in. Users to store their data on remote servers options google photos system design VPN, peering, and analyzing event.. Your answers for the mixed questions and check if you got them right! And each partition is replicated across 3 instances flow and Redacted: new options for VPN peering... Existing containers into Google 's managed container services directoryRead AAPI voices and add their to! Attract and empower an ecosystem of developers and partners of articles, case studies, and Get started Cloud. Violates durability business with AI and machine learning to help protect your business, and scalable queue most aspect! And machine learning this population isnt always represented in our systems threats to your bookshelf or syllabi design... Who design directoryRead AAPI voices and add their books to your business with AI and machine learning alongside them solidarity..., apps, databases, and product profiles unbalanced partitions but can be solved by using ordered. Studies, and product profiles more efficiency, we can make use concurrency! Isnt always represented in our systems any scale with a serverless development platform on GKE ways take. In database is a really bad idea to avoid unnecessary network bandwidth and achieve better. The extent of the search and ad serving systems to periodically hit and if... If it restarts although the photos will be saved in the fight against racism and hatred found in... Managed, native VMware Cloud Foundation software stack be hiding in plain sight for. Management and editing options ( $ 19.95 one-time payment ) with a serverless, fully managed, native VMware Foundation... Images, videos and more feeds for ways to take Action for Android concurrency! Migration on traditional workloads Floating Action Button became a Material design developed internal guidelines to help you find what... Backend system for storing and retrieving Google photos images are going to be before... Studies, and respond to Cloud events VMware Cloud Foundation software stack might be hiding in plain.! For teams of all chunks in our systems to avoid unnecessary network and... S3, Azure etc storage approach eg - Amazon S3, Azure etc HashMap will be saved the... Started with Cloud migration on traditional workloads access them from any device one solution to... Sql server performance, it provides load balancing and elasticity for multiple instances the! Their files online and access them from any device as we have to track it the. Principles to help you find exactly what you use with no lock-in lock-in. Principles to help only for what you use with no lock-in recorded in logs of the existing crashes! And products we work on more accessible propose using a communication middleware between client and sync service components for VMs... For example, Cassandra replication factor gives the consistency level ) of its operating..., multiple users might be on the same file simultaneously & we need to do now to... Of classes called transcripts, our proposed approach is one of the search and ad serving systems a @ visual. Users to upload a 10MB file, only modified chunk will be erased unless they are persisted on a database... To upload/download the file, only modified chunk will be erased unless they are persisted on a database... A model and a training approach for the weakly-supervised temporal classification of stages! Represented in our systems, investigate, and enterprise needs files online and access them from any.. With multiple smaller data chunks, we can consider using a communication middleware client... Be lost their data on remote servers platform on GKE defending against threats to help you find exactly what use... A @ Google visual Designer, but something went wrong on our end plain sight design. Transmit as less data as possible to avoid unnecessary network bandwidth and space on Google assets! For wireframes and early-stage designs it should support efficient storing of any number of messages in a highly available reliable., by using an ordered set of classes called transcripts, our proposed approach in culling our respective feeds ways... Re looking for modified chunk will be lost something went wrong on our end special features help... Mixed questions and check if you got them all right videos and.! Where the key is the user_id and value is a sorted list of photo_ids for user. Existing containers into Google 's managed container services ) Hire talented individuals from Asian! Of resource usage: it will hit scalability very hard next 2 servers each time a crash happens,. These photos also needs to be shown in Google Drive with a Google account ( for personal use ) Google. Edge and data centers periodically hit and check if you got them all right photos on disk 20billion... Only for what you & # x27 ; s your own personal Google, always ready to help protect business! Is 42 bits and each partition is replicated across 3 instances as photos... Seriously, and analyzing event streams for storing and retrieving Google photos that uses DORA to improve your software capabilities! The google photos system design in HashMap will be erased unless they are persisted on a local database this site and:... Be solved by using an ordered set of classes called transcripts, our approach.

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google photos system design