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video metadata\nwith S3 URLs, the user will\naccess video directly from \nS3","name":"Text","parentId":"2ef00091-cdfa-4f07-28cf-d0b6e4207de5","point":[1816.24,656.05],"childIndex":86,"style":{"color":"#ff9900","scale":0.5195652173913039,"stroke":"sm","font":"script_indie_flower"},"rotation":0},"2b4a1f72-f8b2-4376-0d64-ec375ae12c7e":{"id":"2b4a1f72-f8b2-4376-0d64-ec375ae12c7e","type":"Arrow","name":"arrow","parentId":"2ef00091-cdfa-4f07-28cf-d0b6e4207de5","point":[1669.3304137921223,1106.53],"style":{"color":"#000000","scale":1,"stroke":"sm","font":"script"},"handles":{"start":{"id":"start","index":1,"point":[0.5808566023245021,0]},"end":{"id":"end","index":2,"point":[0,238.79999999999995]}},"childIndex":87},"9b2c3c05-41c7-46e6-24c7-2096681726dc":{"id":"9b2c3c05-41c7-46e6-24c7-2096681726dc","type":"Ellipse","name":"Ellipse","parentId":"2ef00091-cdfa-4f07-28cf-d0b6e4207de5","point":[2184.41,1356.53],"size":[116.12,116.12],"childIndex":88,"style":{"color":"#8700ff","scale":1,"stroke":"sm","font":"script"}},"44b79bca-9074-4bda-2071-64bd3eee7f46":{"id":"44b79bca-9074-4bda-2071-64bd3eee7f46","type":"Text","text":"Video\nMetadata\nCache","name":"Text","parentId":"2ef00091-cdfa-4f07-28cf-d0b6e4207de5","point":[2207.43,1384.72],"childIndex":89,"style":{"color":"#8700ff","scale":0.5195652173913039,"stroke":"sm","font":"mono"},"rotation":0},"8054dbb7-a935-4750-164f-7a59edf08e8b":{"id":"8054dbb7-a935-4750-164f-7a59edf08e8b","type":"Arrow","name":"arrow","parentId":"2ef00091-cdfa-4f07-28cf-d0b6e4207de5","point":[1872.8971882610053,639.9236393703749],"style":{"color":"#000000","scale":1,"stroke":"sm","font":"script"},"handles":{"start":{"id":"start","index":1,"point":[0,160.3463606296251]},"end":{"id":"end","index":2,"point":[301.7128117389948,0]}},"childIndex":90},"93fef62f-4ad5-42e8-375e-619868216f9d":{"id":"93fef62f-4ad5-42e8-375e-619868216f9d","type":"Text","text":"[Redis] LRU Cache\n- {video_id: {metadata}}","name":"Text","parentId":"2ef00091-cdfa-4f07-28cf-d0b6e4207de5","point":[2321.19,1393.47],"childIndex":91,"style":{"color":"#000000","scale":0.5195652173913039,"stroke":"sm","font":"mono"},"rotation":0},"e77470f5-5eec-4e66-0cd4-af5980b52d6e":{"id":"e77470f5-5eec-4e66-0cd4-af5980b52d6e","type":"Text","text":"Streaming video (directly from CDN)\n- Downloading / buffering video in chunks\n- Protocols\n - MPEG-DASH (Dynamic Adaptive \n Streaming over HTTP)\n - Apple HLS (HTTP Live Streaming)\n - Microsoft Smooth Streaming\n - Adobe HDS (HTTP Dynamic Streaming)","name":"Text","parentId":"2ef00091-cdfa-4f07-28cf-d0b6e4207de5","point":[745.43,-148.54],"childIndex":93,"style":{"color":"#ff9900","scale":0.5195652173913039,"stroke":"sm","font":"script_indie_flower"},"rotation":0},"8156ef3a-1833-44ed-33a1-eac104f3f74d":{"id":"8156ef3a-1833-44ed-33a1-eac104f3f74d","type":"Arrow","name":"arrow","parentId":"2ef00091-cdfa-4f07-28cf-d0b6e4207de5","point":[1100.4404482572354,94.10000000000002],"style":{"color":"#000000","scale":1,"stroke":"sm","font":"script"},"handles":{"start":{"id":"start","index":1,"point":[0,420.16999999999996]},"end":{"id":"end","index":2,"point":[159.10395273889185,0]}},"childIndex":94},"1d4e7d19-f5a9-42eb-2d52-3c7a832cff2b":{"id":"1d4e7d19-f5a9-42eb-2d52-3c7a832cff2b","type":"Ellipse","name":"Ellipse","parentId":"2ef00091-cdfa-4f07-28cf-d0b6e4207de5","point":[1262.65,77.47],"size":[4.63,4.63],"childIndex":95,"style":{"color":"#000000","scale":1,"stroke":"sm","font":"script"}},"221c8220-d255-4f1c-22f6-7e38eacaf7f0":{"id":"221c8220-d255-4f1c-22f6-7e38eacaf7f0","type":"Arrow","name":"arrow","parentId":"2ef00091-cdfa-4f07-28cf-d0b6e4207de5","point":[1279.2800000000002,79.81931316318482],"style":{"color":"#000000","scale":1,"stroke":"sm","font":"script"},"handles":{"start":{"id":"start","index":1,"point":[0,0]},"end":{"id":"end","index":2,"point":[898.0999999999999,2.152752487340649]}},"childIndex":96},"ea118e74-7429-4ea1-0c8f-cf2b298f1300":{"id":"ea118e74-7429-4ea1-0c8f-cf2b298f1300","type":"Text","text":"Get pre-signed upload URL and\nupload_id (for multipart upload)\n \nCreateMultipartUpload()\n - bucket_id\n - video metadata\n ","name":"Text","parentId":"2ef00091-cdfa-4f07-28cf-d0b6e4207de5","point":[1771.7,143.87],"childIndex":97,"style":{"color":"#000000","scale":0.5195652173913039,"stroke":"sm","font":"mono"},"rotation":0},"f6ef4b86-e8e6-4017-052c-4cc0d870dc92":{"id":"f6ef4b86-e8e6-4017-052c-4cc0d870dc92","type":"Rect","name":"Rect","parentId":"2ef00091-cdfa-4f07-28cf-d0b6e4207de5","point":[981.77,666.15],"size":[153.81,46.06],"childIndex":98,"style":{"color":"#000000","scale":1,"stroke":"sm","font":"mono"}},"6cb7dea3-5626-4791-16d1-90be965dda4f":{"id":"6cb7dea3-5626-4791-16d1-90be965dda4f","type":"Text","text":"Smart 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\nresources and their representations","name":"Text","parentId":"2ef00091-cdfa-4f07-28cf-d0b6e4207de5","point":[206.06,652.2],"childIndex":103,"style":{"color":"#ff9900","scale":0.5195652173913039,"stroke":"sm","font":"script_indie_flower"},"rotation":0},"dd4ec7df-8b97-478c-31f5-b039b3b82f07":{"id":"dd4ec7df-8b97-478c-31f5-b039b3b82f07","type":"Text","text":"For \"Subscribe/Follow\" functionality\nsee the \"Social Network\" sketch","name":"Text","parentId":"2ef00091-cdfa-4f07-28cf-d0b6e4207de5","point":[291.87,264.41],"childIndex":104,"style":{"color":"#ff9900","scale":0.5195652173913039,"stroke":"sm","font":"script_indie_flower"},"rotation":0},"51409353-e155-47d7-3a00-c50fde51070c":{"id":"51409353-e155-47d7-3a00-c50fde51070c","type":"Text","text":"https://www.youtube.com/watch?v=43bB7oSn190","name":"Text","parentId":"2ef00091-cdfa-4f07-28cf-d0b6e4207de5","point":[31.41,1495.26],"childIndex":108,"style":{"color":"#008cff","scale":0.5887406683784258,"stroke":"sm","font":"mono"},"rotation":0},"41120c9f-1abf-4f13-2428-10c777eeafd7":{"id":"41120c9f-1abf-4f13-2428-10c777eeafd7","type":"Image","name":"Image","parentId":"2ef00091-cdfa-4f07-28cf-d0b6e4207de5","point":[-25.75,1384.04],"size":[41.77,41.77],"childIndex":109,"assetId":"c0194977-d216-4b85-1da6-945a67b78d1f","style":{"color":"#ff008a","scale":1,"stroke":"sm","font":"script"}},"26c416b9-009a-45b7-15b8-5642932f7979":{"id":"26c416b9-009a-45b7-15b8-5642932f7979","type":"Image","name":"Image","parentId":"2ef00091-cdfa-4f07-28cf-d0b6e4207de5","point":[-23.93,1105.88],"size":[44.17,44.17],"childIndex":110,"assetId":"675370b2-d2e8-42c8-0cd5-5435207de18a","style":{"color":"#ff008a","scale":1,"stroke":"sm","font":"script"}},"e5b71b52-b49a-41e1-181c-75075a4ecc1d":{"id":"e5b71b52-b49a-41e1-181c-75075a4ecc1d","type":"Ellipse","name":"Ellipse","parentId":"2ef00091-cdfa-4f07-28cf-d0b6e4207de5","point":[1349.08,1357.95],"size":[116.12,116.12],"childIndex":111,"style":{"color":"#008cff","scale":1,"stroke":"sm","font":"script"}},"ac64fc34-b25a-41b7-2b43-3ff4c5ce3fad":{"id":"ac64fc34-b25a-41b7-2b43-3ff4c5ce3fad","type":"Text","text":"Comments","name":"Text","parentId":"2ef00091-cdfa-4f07-28cf-d0b6e4207de5","point":[1365.61,1403.56],"childIndex":112,"style":{"color":"#008cff","scale":0.5195652173913039,"stroke":"sm","font":"mono"},"rotation":0},"485e6fdb-b0d7-4ef3-250b-92f1523017ac":{"id":"485e6fdb-b0d7-4ef3-250b-92f1523017ac","type":"Text","text":"[Cassandra | DynamoDB]\n(video_id + timestamp - sorting index)\n- video_id (partition key)\n- timestamp\n- user_id\n- 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resolution (i.e. 1080px)\n- encoding (i.e. H264)\n- chunk_order (i.e. 1, 2)\n- hash (i.e. dg345, rt564)\n- url (s3.com...)","name":"Text","parentId":"2ef00091-cdfa-4f07-28cf-d0b6e4207de5","point":[2327.95,1046.91],"childIndex":116,"style":{"color":"#000000","scale":0.5195652173913039,"stroke":"sm","font":"mono"},"rotation":0},"891a25d3-2bcf-4327-2a7f-37a2716fa673":{"id":"891a25d3-2bcf-4327-2a7f-37a2716fa673","type":"Text","text":"All chunks for one video are\non the same 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Initiate upload (client --> upload service)\n - get pre-signed S3 URL\n - store initial video metadata\n \n2. Upload to S3 (client --> S3)\n - directly from client\n - using pre-signed URL\n - using multipart upload\n \n3. Complete upload to S3 (client --> S3)\n - S3 assembles all parts into one file\n \n4. 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requests a ride based on the estimate\n- Driver accepts/denies request + Navigates to pickup/drop-off \n \n \nNon-functional requirements:\n---------------------------- \n- Low latency for rider-driver matching (<1min)\n- Consistency of rider-driver 1:1 matching\n - For one ride, only one driver will get request at a time\n- Highly available outside matching \n- Handle high-throughput (peak hours, popular events)\n \n \nCore entities:\n-------------- \n- Rider\n- Driver\n- Ride\n- Location\n \n \nAPI:\n--------------- \n- POST /getEstimate({from, to}) --> Partial<Ride>\n \n- POST /requestRide({ride_id}) --> Ride\n \n- POST /getRide({ride_id})\n \n - gets the latest ride entity to display the \n ride details for both rider and driver apps\n \n- POST /updateLocation({lat, lon})\n \n - both driver and rider can update their locations\n which may be used to display their on the map\n - drivers might update their location i.e. once\n per 5 seconds (it is needed for matching)\n - however this can be optimised on the client side,\n where we might say that location update is\n proportional to driver speed: for still drivers\n we update location rarely, for moving - more often\n \n- POST /acceptRide({ride_id, accept})\n \n - ride is being accepted by the driver\n \n- POST /updateRide({ride_id, status})\n - ","name":"Text","parentId":"3033cade-7fcb-420a-0937-64245b7a1dc4","point":[27.89,210.46],"childIndex":3,"style":{"color":"#000000","scale":0.5195652173913039,"stroke":"sm","font":"mono"},"rotation":0},"8d3f20df-399a-4fe0-35b9-82ec44adb912":{"id":"8d3f20df-399a-4fe0-35b9-82ec44adb912","type":"Text","text":"Library of elements","name":"Text","parentId":"3033cade-7fcb-420a-0937-64245b7a1dc4","point":[27.89,1365.51],"childIndex":4,"style":{"color":"#000000","scale":1,"stroke":"sm","font":"script"}},"6b14ccd4-5458-4fd6-33ba-4d930d8b64a8":{"id":"6b14ccd4-5458-4fd6-33ba-4d930d8b64a8","type":"Rect","name":"Rect","parentId":"3033cade-7fcb-420a-0937-64245b7a1dc4","point":[603.7,1463.19],"size":[207.37,48.3],"childIndex":5,"style":{"color":"#000000","scale":1,"stroke":"sm","font":"script"}},"27e4f2e6-52fb-4af7-0115-2614d7bcd8a7":{"id":"27e4f2e6-52fb-4af7-0115-2614d7bcd8a7","type":"Text","text":"Message\n 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UserFollowing?","name":"Text","parentId":"d0af682e-08cb-4b6f-3e12-1f5c1d3f8aec","point":[1653.07,-50.01],"childIndex":605,"style":{"color":"#ff008a","scale":0.5195652173913039,"stroke":"sm","font":"mono"},"rotation":0},"f4a4b9ba-797b-4c67-2472-6e1df700a9cb":{"id":"f4a4b9ba-797b-4c67-2472-6e1df700a9cb","type":"Text","text":"Add URL shortener service?\nFor URLs in the post?","name":"Text","parentId":"d0af682e-08cb-4b6f-3e12-1f5c1d3f8aec","point":[1971.92,1181.49],"childIndex":606,"style":{"color":"#ff008a","scale":0.5195652173913039,"stroke":"sm","font":"mono"},"rotation":0},"66d99cce-6ea7-470e-260c-035f664ecf50":{"id":"66d99cce-6ea7-470e-260c-035f664ecf50","type":"Image","name":"Image","parentId":"d0af682e-08cb-4b6f-3e12-1f5c1d3f8aec","point":[-20.48,1345.86],"size":[46.45,46.45],"childIndex":193,"assetId":"4b65cdc1-1649-4a9d-271d-7300aa389edb","style":{"color":"#ff008a","scale":1,"stroke":"sm","font":"script"}},"29739afc-e51e-451c-024e-15aa9d9391e9":{"id":"29739afc-e51e-451c-024e-15aa9d9391e9","type":"Image","name":"Image","parentId":"d0af682e-08cb-4b6f-3e12-1f5c1d3f8aec","point":[-18.42,1643.86],"size":[39.28,39.28],"childIndex":194,"assetId":"837aa023-8a9f-4fcd-37e2-536c7897dd82","style":{"color":"#ff008a","scale":1,"stroke":"sm","font":"script"}},"1ea1fea7-4115-4388-0111-a5bc9b818d70":{"id":"1ea1fea7-4115-4388-0111-a5bc9b818d70","type":"Text","text":"Alternatively, 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