Ticketmaster

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Users should be able to view events\n2. Users should be able to book tickets to\nevents\n3. Users should be able to search for events\n\n\nBelow the line (out of scope):\n1. Users should be able to view their booked\nevents\n2. Admins or event coordinators should be\nable to add events\n3. Popular events should have dynamic pricing", "textAlign": "left", "verticalAlign": "top", "containerId": null, "originalText": "Functional Requirements\n1. Users should be able to view events\n2. Users should be able to book tickets to\nevents\n3. Users should be able to search for events\n\n\nBelow the line (out of scope):\n1. Users should be able to view their booked\nevents\n2. Admins or event coordinators should be\nable to add events\n3. Popular events should have dynamic pricing", "lineHeight": 1.25, "index": "a4", "autoResize": true }, { "type": "text", "version": 2236, "versionNonce": 991349893, "isDeleted": false, "id": "u0-2G4eWi-93mRQL7bG1J", "fillStyle": "solid", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 0, "opacity": 100, "angle": 0, "x": 692.5709524849008, "y": 221.49920724837148, "strokeColor": "#1e1e1e", "backgroundColor": "#fefefe", "width": 563.61962890625, "height": 325, "seed": 1234539129, "groupIds": [], "frameId": null, "roundness": null, "boundElements": [], "updated": 1767418547964, "link": null, "locked": false, "fontSize": 20, "fontFamily": 5, "text": "Non Functional Req\n- Scale: 50k events per year, 100mil tickets sold per year \n- Availability for searching and viewing events\n- Consistency for booking events (no double\nevents)\n- The system should be scalable and able to\nhandle high throughput in the form of popular\nevents\n- Read heavy, high read throughput (read >> write)\n\nBelow the line (out of scope)\nGDPR compliant, fault tolerant, secure \ntransactions for purchases, CI/CD, backups", "textAlign": "left", "verticalAlign": "top", "containerId": null, "originalText": "Non Functional Req\n- Scale: 50k events per year, 100mil tickets sold per year \n- Availability for searching and viewing events\n- Consistency for booking events (no double\nevents)\n- The system should be scalable and able to\nhandle high throughput in the form of popular\nevents\n- Read heavy, high read throughput (read >> write)\n\nBelow the line (out of scope)\nGDPR compliant, fault tolerant, secure \ntransactions for purchases, CI/CD, backups", "lineHeight": 1.25, "index": "a9", "autoResize": true }, { "type": "text", "version": 2582, "versionNonce": 154742053, "isDeleted": false, "id": "ob5RQnjIq8fhuYFgaRg5B", "fillStyle": "solid", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 0, "opacity": 100, "angle": 0, "x": 158.33594607758943, "y": 679.6142189577099, "strokeColor": "#1e1e1e", "backgroundColor": "#fefefe", "width": 849.4793701171875, "height": 1300, "seed": 407310649, "groupIds": [], "frameId": null, "roundness": null, "boundElements": [], "updated": 1767416864408, "link": null, "locked": false, "fontSize": 20, "fontFamily": 5, "text": "Core Entities\n\n- Event\n- Performer\n- Venue\n- Ticket\n- Booking\n\n\n\nAPI\n\n1) Users should be able to view events\n\nGET /events/details/{eventId} -> Event & Venue & Performer & Ticket[]\n\n- tickets are to render the seat map on the Client\n\nGET /events/search?keyword={keyword}&start={start_date}&end={end_date}\n&pageSize={page_size}&page={page_number} -> Event[]\n\n\nPOST /booking/checkout -> bookingId\n{\n \"ticketsId\": string[]\n}\n\nPOST /booking/confirm -> Success/Failure\n{\n \"bookingId\": string\n \"paymentDetails\": ...\n}\n\n\nHow to lock tickets \n\n1) Pessimistic locking (i.e database locking) -> not meant for long periods, some dbs\ndon't support natively\n\n2) Status and Expiration Time on Ticket Table\n-> Add lock by adding a status field and expiration time on the ticket table.\n-> when a user selects a ticket, status changes from available to reserved, and the\ncurrent timestamp is recorded.\n-> use cron job: Delay in unlocking can lead to efficiencies\n-> on demand: performance impact (extra read)\n\n3) Distributed Lock with TTL apporach\n\n1. Acquire a lock in Redis with uuid (ticket id) with a predefined TTL\n2. If the user completes the purchase, the ticket's status in the database is updated\nto \"booked\" and the lock in Redis is manually released\n3. if ttl expires, then Redis releases the lock", "textAlign": "left", "verticalAlign": "top", "containerId": null, "originalText": "Core Entities\n\n- Event\n- Performer\n- Venue\n- Ticket\n- Booking\n\n\n\nAPI\n\n1) Users should be able to view events\n\nGET /events/details/{eventId} -> Event & Venue & Performer & Ticket[]\n\n- tickets are to render the seat map on the Client\n\nGET /events/search?keyword={keyword}&start={start_date}&end={end_date}\n&pageSize={page_size}&page={page_number} -> Event[]\n\n\nPOST /booking/checkout -> bookingId\n{\n \"ticketsId\": string[]\n}\n\nPOST /booking/confirm -> Success/Failure\n{\n \"bookingId\": string\n \"paymentDetails\": ...\n}\n\n\nHow to lock tickets \n\n1) Pessimistic locking (i.e database locking) -> not meant for long periods, some dbs\ndon't support natively\n\n2) Status and Expiration Time on Ticket Table\n-> Add lock by adding a status field and expiration time on the ticket table.\n-> when a user selects a ticket, status changes from available to reserved, and the\ncurrent timestamp is recorded.\n-> use cron job: Delay in unlocking can lead to efficiencies\n-> on demand: performance impact (extra read)\n\n3) Distributed Lock with TTL apporach\n\n1. 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