Tiny URL

{ "type": "excalidraw", "version": 2, "source": "https://marketplace.visualstudio.com/items?itemName=pomdtr.excalidraw-editor", "elements": [ { "type": "text", "version": 2687, "versionNonce": 423810927, "isDeleted": false, "id": "fvY_cTE49UPBlLZ7gzKIn", "fillStyle": "cross-hatch", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 2, "opacity": 100, "angle": 0, "x": 1273.3253238858188, "y": -25285.38440445232, "strokeColor": "#000", "backgroundColor": "#000", "width": 33, "height": 45, "seed": 46326697, "groupIds": [], "frameId": null, "roundness": { "type": 2 }, "boundElements": [], "updated": 1760909551420, "link": null, "locked": false, "fontSize": 33.23791410279167, "fontFamily": 1, "text": "✨", "textAlign": "left", "verticalAlign": "top", "containerId": null, "originalText": "✨", "lineHeight": 1.3538755729626375, "index": "a0", "autoResize": true }, { "type": "text", "version": 3498, "versionNonce": 848026369, "isDeleted": false, "id": "0wnBzZsi_tM-pMBhoWlu8", "fillStyle": "solid", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 2, "opacity": 100, "angle": 0, "x": 1320.2767041180568, "y": -25273.104431403222, "strokeColor": "#495057", "backgroundColor": "#fff", "width": 186.1759033203125, "height": 20, "seed": 1662956169, "groupIds": [], "frameId": null, "roundness": null, "boundElements": [], "updated": 1760909551420, "link": null, "locked": false, "fontSize": 16, "fontFamily": 1, "text": "Functional Requirements", "textAlign": "left", "verticalAlign": "top", "containerId": null, "originalText": "Functional Requirements", "lineHeight": 1.25, "index": "a1", "autoResize": true }, { "type": "line", "version": 1788, "versionNonce": 1895043471, "isDeleted": false, "id": "gcmPVNnY9zNTQ9XlZi28a", "fillStyle": "hachure", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 2, "opacity": 100, "angle": 0, "x": 1274.0494136077232, "y": -25237.91864850504, "strokeColor": "#000000", "backgroundColor": "transparent", "width": 165.2005648542745, "height": 0.8295616012067057, "seed": 756250569, "groupIds": [], "frameId": null, "roundness": { "type": 2 }, "boundElements": [], "updated": 1760909551420, "link": null, "locked": false, "startBinding": null, "endBinding": null, "lastCommittedPoint": null, "startArrowhead": null, "endArrowhead": null, "points": [ [ 0, 0 ], [ 165.2005648542745, 0.8295616012067057 ] ], "index": "a2" }, { "type": "text", "version": 1559, "versionNonce": 1429918433, "isDeleted": false, "id": "3HsmbXx6GUv8wI3qORiaR", "fillStyle": "solid", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 0, "opacity": 100, "angle": 0, "x": 1280.6543254032526, "y": -25218.06277251854, "strokeColor": "#1e1e1e", "backgroundColor": "#fefefe", "width": 446.13970947265625, "height": 182, "seed": 344376297, "groupIds": [], "frameId": null, "roundness": null, "boundElements": [], "updated": 1760909551420, "link": null, "locked": false, "fontSize": 20, "fontFamily": 1, "text": "1. Generate unique shortURL per long\nURL/paste\n - How can we ensure these are unique?\n\n2. Per generated URL allow the original\nposter to see the number of clicks\n - How can we ensure these are accurate", "textAlign": "left", "verticalAlign": "top", "containerId": null, "originalText": "1. Generate unique shortURL per long\nURL/paste\n - How can we ensure these are unique?\n\n2. Per generated URL allow the original\nposter to see the number of clicks\n - How can we ensure these are accurate", "lineHeight": 1.3, "index": "a3", "autoResize": true }, { "type": "text", "version": 5314, "versionNonce": 1320748975, "isDeleted": false, "id": "JLfwjcPDnvqBCWBbxCgky", "fillStyle": "hachure", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 1, "opacity": 100, "angle": 0, "x": 1294.9002740149233, "y": -24614.316055733852, "strokeColor": "#1e1e1e", "backgroundColor": "transparent", "width": 441.6796569824219, "height": 260, "seed": 2056547369, "groupIds": [], "frameId": null, "roundness": null, "boundElements": [], "updated": 1760909551420, "link": null, "locked": false, "fontSize": 20, "fontFamily": 1, "text": "1. Median URL has 10k clicks, most popular\nURL in millions of clicks\n2. At a time may have to support about to\n1 trillion URLs\n3. For certain pastes, text sizes can be in \nthe gigabytes, average size in kilobytes,\n1 trillion X 1kb = 1 petabyte\n\n# of Reads >> # of Writes (want to \noptimize these)", "textAlign": "left", "verticalAlign": "top", "containerId": null, "originalText": "1. Median URL has 10k clicks, most popular\nURL in millions of clicks\n2. At a time may have to support about to\n1 trillion URLs\n3. For certain pastes, text sizes can be in \nthe gigabytes, average size in kilobytes,\n1 trillion X 1kb = 1 petabyte\n\n# of Reads >> # of Writes (want to \noptimize these)", "lineHeight": 1.3, "index": "a4", "autoResize": true }, { "type": "text", "version": 4278, "versionNonce": 1526714049, "isDeleted": false, "id": "CGyIYH8CdO3jhFJvMJZaw", "fillStyle": "solid", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 2, "opacity": 100, "angle": 0, "x": 1339.319340867621, "y": -24670.797153198368, "strokeColor": "#495057", "backgroundColor": "#fff", "width": 238.6078643798828, "height": 20, "seed": 60389737, "groupIds": [], "frameId": null, "roundness": null, "boundElements": [], "updated": 1760909551420, "link": null, "locked": false, "fontSize": 16, "fontFamily": 1, "text": "Back of Envelope Calculations", "textAlign": "left", "verticalAlign": "top", "containerId": null, "originalText": "Back of Envelope Calculations", "lineHeight": 1.25, "index": "a5", "autoResize": true }, { "type": "line", "version": 2476, "versionNonce": 817510863, "isDeleted": false, "id": "02RXaxoIfX_wvDNpgtYbU", "fillStyle": "hachure", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 2, "opacity": 100, "angle": 0, "x": 1291.5221915260142, "y": -24631.749843951842, "strokeColor": "#000000", "backgroundColor": "transparent", "width": 263.6620648633493, "height": 1.238537448047282, "seed": 1430492841, "groupIds": [], "frameId": null, "roundness": { "type": 2 }, "boundElements": [], "updated": 1760909551420, "link": null, "locked": false, "startBinding": null, "endBinding": null, "lastCommittedPoint": null, "startArrowhead": null, "endArrowhead": null, "points": [ [ 0, 0 ], [ 263.6620648633493, -1.238537448047282 ] ], "index": "a6" }, { "type": "rectangle", "version": 2450, "versionNonce": 2054835873, "isDeleted": false, "id": "-qPTi6tSQydcUU4fa_aq1", "fillStyle": "solid", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 2, "opacity": 100, "angle": 0, "x": 1770.228248682442, "y": -25283.33110371985, "strokeColor": "#495057", "backgroundColor": "transparent", "width": 908.4307242809056, "height": 944.7621335088247, "seed": 1508556905, "groupIds": [], "frameId": null, "roundness": null, "boundElements": [], "updated": 1760909551420, "link": null, "locked": false, "index": "a7" }, { "type": "rectangle", "version": 2399, "versionNonce": 1007691759, "isDeleted": false, "id": "hYLVW619S7NFf7gYbHFd9", "fillStyle": "solid", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 2, "opacity": 100, "angle": 0, "x": 1267.2811285047214, "y": -25289.52366748303, "strokeColor": "#495057", "backgroundColor": "transparent", "width": 471.3223044676661, "height": 292.6447790905742, "seed": 1164495689, "groupIds": [], "frameId": null, "roundness": null, "boundElements": [], "updated": 1760909551420, "link": null, "locked": false, "index": "a8" }, { "type": "rectangle", "version": 2679, "versionNonce": 1784271489, "isDeleted": false, "id": "auc2Y-H1_1PMLp2v5aNGY", "fillStyle": "solid", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 1, "opacity": 100, "angle": 0, "x": 1275.8760062523274, "y": -24681.62932175046, "strokeColor": "#495057", "backgroundColor": "transparent", "width": 470.34480081656045, "height": 350.2186005317186, "seed": 1719880969, "groupIds": [], "frameId": null, "roundness": null, "boundElements": [], "updated": 1760909551420, "link": null, "locked": false, "index": "a9" }, { "type": "text", "version": 567, "versionNonce": 1589858831, "isDeleted": false, "id": "2G7hR-3VHk_Rvp1NYYR5h", "fillStyle": "cross-hatch", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 1, "opacity": 100, "angle": 0, "x": 1272.8880244299035, "y": -25358.553504557593, "strokeColor": "#000000", "backgroundColor": "#fff", "width": 458.099853515625, "height": 46, "seed": 2111080489, "groupIds": [], "frameId": null, "roundness": null, "boundElements": [], "updated": 1760909551420, "link": null, "locked": false, "fontSize": 36, "fontFamily": 1, "text": "Design TinyUrl + Pastebin", "textAlign": "left", "verticalAlign": "top", "containerId": null, "originalText": "Design TinyUrl + Pastebin", "lineHeight": 1.2777777777777777, "index": "aA", "autoResize": true }, { "type": "text", "version": 3322, "versionNonce": 1599986273, "isDeleted": false, "id": "2nW9X5cOb90pg1C4Qnv5e", "fillStyle": "cross-hatch", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 2, "opacity": 100, "angle": 0, "x": 1289.7200455974905, "y": -24677.900576227148, "strokeColor": "#000", "backgroundColor": "#000", "width": 36, "height": 49.15083451704544, "seed": 681962311, "groupIds": [], "frameId": null, "roundness": { "type": 2 }, "boundElements": [], "updated": 1760909551420, "link": null, "locked": false, "fontSize": 36.30380479462411, "fontFamily": 1, "text": "✉️", "textAlign": "left", "verticalAlign": "top", "containerId": null, "originalText": "✉️", "lineHeight": 1.353875572962637, "index": "aB", "autoResize": true }, { "type": "text", "version": 2807, "versionNonce": 835467311, "isDeleted": false, "id": "aAjDpBeDVH0BsPh7vMDzm", "fillStyle": "cross-hatch", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 2, "opacity": 100, "angle": 0, "x": 1785.1225052392133, "y": -25267.887906545253, "strokeColor": "#000", "backgroundColor": "#000", "width": 33, "height": 45, "seed": 1353336969, "groupIds": [], "frameId": null, "roundness": { "type": 2 }, "boundElements": [], "updated": 1760909551420, "link": null, "locked": false, "fontSize": 33.23791410279167, "fontFamily": 1, "text": "✨", "textAlign": "left", "verticalAlign": "top", "containerId": null, "originalText": "✨", "lineHeight": 1.3538755729626375, "index": "aC", "autoResize": true }, { "type": "text", "version": 3666, "versionNonce": 1247143489, "isDeleted": false, "id": "UJ7RJPgL1gVeoqMLBl4Id", "fillStyle": "solid", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 2, "opacity": 100, "angle": 0, "x": 1832.0738854714514, "y": -25255.607933496158, "strokeColor": "#495057", "backgroundColor": "#fff", "width": 132.81593322753906, "height": 20, "seed": 658657129, "groupIds": [], "frameId": null, "roundness": null, "boundElements": [], "updated": 1760909551420, "link": null, "locked": false, "fontSize": 16, "fontFamily": 1, "text": "High Level Design", "textAlign": "left", "verticalAlign": "top", "containerId": null, "originalText": "High Level Design", "lineHeight": 1.25, "index": "aD", "autoResize": true }, { "type": "line", "version": 1908, "versionNonce": 454253135, "isDeleted": false, "id": "3o_D70YfW3ot3wYLuUTq1", "fillStyle": "hachure", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 2, "opacity": 100, "angle": 0, "x": 1785.8465949611177, "y": -25220.422150597977, "strokeColor": "#000000", "backgroundColor": "transparent", "width": 165.2005648542745, "height": 0.8295616012067057, "seed": 1056340553, "groupIds": [], "frameId": null, "roundness": { "type": 2 }, "boundElements": [], "updated": 1760909551420, "link": null, "locked": false, "startBinding": null, "endBinding": null, "lastCommittedPoint": null, "startArrowhead": null, "endArrowhead": null, "points": [ [ 0, 0 ], [ 165.2005648542745, 0.8295616012067057 ] ], "index": "aE" }, { "type": "text", "version": 2610, "versionNonce": 1170769633, "isDeleted": false, "id": "aUEMc4P-okpklmJGb1_AQ", "fillStyle": "solid", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 0, "opacity": 100, "angle": 0, "x": 1783.3100589261567, "y": -25197.42415098148, "strokeColor": "#1e1e1e", "backgroundColor": "#fefefe", "width": 845.4793090820312, "height": 884, "seed": 1100119239, "groupIds": [], "frameId": null, "roundness": null, "boundElements": [], "updated": 1760909719386, "link": null, "locked": false, "fontSize": 20, "fontFamily": 1, "text": "Link Generator Service\n\nIdea: We probably want to hash (longURL, userId, create timeStamp)\n\n-> h(\"google.com\", 1, 01/01/2024) = tinyurl.com/32fz1c98\n\nNumber of characters? -> possiblilites = 36^n if we use 0-9, a - z\n\nif n = 8, we have around 2 trillion combinations\n\nHash Collisions? If 32f21ca8 is taken try 32fz1ca9 (basically try probing)\n\n\nAssigning URLs - Replication\n\nWe want to try to maximize our write throughput where possible!\n-> Can we use multi-leader/leaderless replication? NO!\n-> Telling people a few minutes later is too late\n-> Rules out Cassandra, Scylla, Riak, etcs (Need to use Single Leader)\n\nAssigning URLs - Replication\n\nSometimes, we can speed up our writes via the use of a write back cache\n\nBut run into same issue as above\n\nAssigning URLs - Partitioning\n\nNot only is partitioning very important if we have a lot of data, it can help us\nspeed up our reads and writes by reducing load on every node\n\nCan partition by range of short URL, they're already hashes so should be relatively\neven (use consistent hashing)\n", "textAlign": "left", "verticalAlign": "top", "containerId": null, "originalText": "Link Generator Service\n\nIdea: We probably want to hash (longURL, userId, create timeStamp)\n\n-> h(\"google.com\", 1, 01/01/2024) = tinyurl.com/32fz1c98\n\nNumber of characters? -> possiblilites = 36^n if we use 0-9, a - z\n\nif n = 8, we have around 2 trillion combinations\n\nHash Collisions? If 32f21ca8 is taken try 32fz1ca9 (basically try probing)\n\n\nAssigning URLs - Replication\n\nWe want to try to maximize our write throughput where possible!\n-> Can we use multi-leader/leaderless replication? NO!\n-> Telling people a few minutes later is too late\n-> Rules out Cassandra, Scylla, Riak, etcs (Need to use Single Leader)\n\nAssigning URLs - Replication\n\nSometimes, we can speed up our writes via the use of a write back cache\n\nBut run into same issue as above\n\nAssigning URLs - Partitioning\n\nNot only is partitioning very important if we have a lot of data, it can help us\nspeed up our reads and writes by reducing load on every node\n\nCan partition by range of short URL, they're already hashes so should be relatively\neven (use consistent hashing)\n", "lineHeight": 1.3, "index": "aF", "autoResize": true }, { "type": "rectangle", "version": 2989, "versionNonce": 795949167, "isDeleted": false, "id": "esX7hzqVKjBVgak6JZP6O", "fillStyle": "solid", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 2, "opacity": 100, "angle": 0, "x": 2707.296771126412, "y": -25275.61658110379, "strokeColor": "#495057", "backgroundColor": "transparent", "width": 908.4307242809056, "height": 944.7621335088247, "seed": 1078071047, "groupIds": [], "frameId": null, "roundness": null, "boundElements": [], "updated": 1760909551420, "link": null, "locked": false, "index": "aG" }, { "type": "text", "version": 3346, "versionNonce": 632293889, "isDeleted": false, "id": "PJbS2L89OIUZEH3RimH5I", "fillStyle": "cross-hatch", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 2, "opacity": 100, "angle": 0, "x": 2722.191027683183, "y": -25260.173383929192, "strokeColor": "#000", "backgroundColor": "#000", "width": 33, "height": 45, "seed": 2002294311, "groupIds": [], "frameId": null, "roundness": { "type": 2 }, "boundElements": [], "updated": 1760909551420, "link": null, "locked": false, "fontSize": 33.23791410279167, "fontFamily": 1, "text": "✨", "textAlign": "left", "verticalAlign": "top", "containerId": null, "originalText": "✨", "lineHeight": 1.3538755729626375, "index": "aH", "autoResize": true }, { "type": "text", "version": 4217, "versionNonce": 1420710543, "isDeleted": false, "id": "MB8l2TTwR0kXB2m1XTig6", "fillStyle": "solid", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 2, "opacity": 100, "angle": 0, "x": 2769.1424079154212, "y": -25247.893410880097, "strokeColor": "#495057", "backgroundColor": "#fff", "width": 224.19189453125, "height": 20, "seed": 340867399, "groupIds": [], "frameId": null, "roundness": null, "boundElements": [], "updated": 1760909551420, "link": null, "locked": false, "fontSize": 16, "fontFamily": 1, "text": "High Level Design (continued)", "textAlign": "left", "verticalAlign": "top", "containerId": null, "originalText": "High Level Design (continued)", "lineHeight": 1.25, "index": "aI", "autoResize": true }, { "type": "line", "version": 2447, "versionNonce": 1375805921, "isDeleted": false, "id": "JmLbiZkqCF_HuUwWYFGqJ", "fillStyle": "hachure", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 2, "opacity": 100, "angle": 0, "x": 2722.9151174050876, "y": -25212.707627981916, "strokeColor": "#000000", "backgroundColor": "transparent", "width": 165.2005648542745, "height": 0.8295616012067057, "seed": 1284012135, "groupIds": [], "frameId": null, "roundness": { "type": 2 }, "boundElements": [], "updated": 1760909551420, "link": null, "locked": false, "startBinding": null, "endBinding": null, "lastCommittedPoint": null, "startArrowhead": null, "endArrowhead": null, "points": [ [ 0, 0 ], [ 165.2005648542745, 0.8295616012067057 ] ], "index": "aJ" }, { "type": "text", "version": 3009, "versionNonce": 595798191, "isDeleted": false, "id": "PVzZApbkMbjj_KI26Kr5A", "fillStyle": "solid", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 0, "opacity": 100, "angle": 0, "x": 2719.6640134904783, "y": -25190.125121808094, "strokeColor": "#1e1e1e", "backgroundColor": "#fefefe", "width": 784.1593627929688, "height": 910, "seed": 1976226695, "groupIds": [], "frameId": null, "roundness": null, "boundElements": [], "updated": 1760909551420, "link": null, "locked": false, "fontSize": 20, "fontFamily": 1, "text": "Assigning URLs - Single Node\n\nWe need to lock on rows that don't exist ( can use predicate locks)\n-> Index on ShortURL makes predicate query much faster!\n-> Using a stored procedure can reduce network calls in event of hash collision\n\nAssigning URLs - Materializing Conflicts\n\nCan prepopulate every possible row in our database so they exist to lock on!\n(8 bytes * 1 trillion = ~16tb)\n\nAssigning URLs - Engine Implementation?\n\nWe don't need range queries, so a hash index would be super fast,\nbut we're storing 1pb of data so probably too expensive for in memory DB\n\nB - Tree is probably better for us!\n+Reads, -Writes\n\nAssigning URLs - Database Choice\n\nSo far we have:\n - Single Leader Replication\n - Partitioned\n - B-tree based\n\nSeems ok to use a relational DB, no plan to create distributed joins. MySQL?\n\nMaximizing Read Speeds\n\nReplicas + multiple partions ensure adequate ability to handle load\n-> Possilbe to get stale reads from replica, could check leader on null result\n\n\n", "textAlign": "left", "verticalAlign": "top", "containerId": null, "originalText": "Assigning URLs - Single Node\n\nWe need to lock on rows that don't exist ( can use predicate locks)\n-> Index on ShortURL makes predicate query much faster!\n-> Using a stored procedure can reduce network calls in event of hash collision\n\nAssigning URLs - Materializing Conflicts\n\nCan prepopulate every possible row in our database so they exist to lock on!\n(8 bytes * 1 trillion = ~16tb)\n\nAssigning URLs - Engine Implementation?\n\nWe don't need range queries, so a hash index would be super fast,\nbut we're storing 1pb of data so probably too expensive for in memory DB\n\nB - Tree is probably better for us!\n+Reads, -Writes\n\nAssigning URLs - Database Choice\n\nSo far we have:\n - Single Leader Replication\n - Partitioned\n - B-tree based\n\nSeems ok to use a relational DB, no plan to create distributed joins. MySQL?\n\nMaximizing Read Speeds\n\nReplicas + multiple partions ensure adequate ability to handle load\n-> Possilbe to get stale reads from replica, could check leader on null result\n\n\n", "lineHeight": 1.3, "index": "aK", "autoResize": true }, { "type": "rectangle", "version": 2596, "versionNonce": 673463745, "isDeleted": false, "id": "ZdLlxKj7d-TsyWAkhA2vQ", "fillStyle": "solid", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 2, "opacity": 100, "angle": 0, "x": 1270.1892091330462, "y": -24315.424461947616, "strokeColor": "#495057", "backgroundColor": "transparent", "width": 908.4307242809056, "height": 1027.450254178248, "seed": 518288972, "groupIds": [], "frameId": null, "roundness": null, "boundElements": [], "updated": 1760909551420, "link": null, "locked": false, "index": "aL" }, { "type": "text", "version": 2904, "versionNonce": 160971471, "isDeleted": false, "id": "ExGvokmfdai2I7gSXOsg_", "fillStyle": "cross-hatch", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 2, "opacity": 100, "angle": 0, "x": 1285.0834656898176, "y": -24299.981264773018, "strokeColor": "#000", "backgroundColor": "#000", "width": 33, "height": 45, "seed": 840420556, "groupIds": [], "frameId": null, "roundness": { "type": 2 }, "boundElements": [], "updated": 1760909551420, "link": null, "locked": false, "fontSize": 33.23791410279167, "fontFamily": 1, "text": "✨", "textAlign": "left", "verticalAlign": "top", "containerId": null, "originalText": "✨", "lineHeight": 1.3538755729626375, "index": "aM", "autoResize": true }, { "type": "text", "version": 3777, "versionNonce": 658038177, "isDeleted": false, "id": "7-QNiat88qMkarnaCVlfo", "fillStyle": "solid", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 2, "opacity": 100, "angle": 0, "x": 1332.0348459220556, "y": -24287.701291723923, "strokeColor": "#495057", "backgroundColor": "#fff", "width": 224.19189453125, "height": 20, "seed": 1637634892, "groupIds": [], "frameId": null, "roundness": null, "boundElements": [], "updated": 1760909551420, "link": null, "locked": false, "fontSize": 16, "fontFamily": 1, "text": "High Level Design (continued)", "textAlign": "left", "verticalAlign": "top", "containerId": null, "originalText": "High Level Design (continued)", "lineHeight": 1.25, "index": "aN", "autoResize": true }, { "type": "line", "version": 2005, "versionNonce": 730204399, "isDeleted": false, "id": "srOMd3wGAG6_EHxS6kLJN", "fillStyle": "hachure", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 2, "opacity": 100, "angle": 0, "x": 1285.807555411722, "y": -24252.51550882574, "strokeColor": "#000000", "backgroundColor": "transparent", "width": 165.2005648542745, "height": 0.8295616012067057, "seed": 1808533964, "groupIds": [], "frameId": null, "roundness": { "type": 2 }, "boundElements": [], "updated": 1760909551420, "link": null, "locked": false, "startBinding": null, "endBinding": null, "lastCommittedPoint": null, "startArrowhead": null, "endArrowhead": null, "points": [ [ 0, 0 ], [ 165.2005648542745, 0.8295616012067057 ] ], "index": "aO" }, { "type": "text", "version": 2599, "versionNonce": 1047429505, "isDeleted": false, "id": "QgGAZ1OtP7mOrDnwLA865", "fillStyle": "solid", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 0, "opacity": 100, "angle": 0, "x": 1282.3856974786074, "y": -24229.32412961776, "strokeColor": "#1e1e1e", "backgroundColor": "#fefefe", "width": 856.499267578125, "height": 910, "seed": 868282444, "groupIds": [], "frameId": null, "roundness": null, "boundElements": [], "updated": 1760909551420, "link": null, "locked": false, "fontSize": 20, "fontFamily": 1, "text": "Hot Links -> basically use cache \n\nWrite back, can have write conflicts\nWrite through, slows down write speeds\nWrite around, causes initial cache miss best option for us\n-> Write to db first, as users read from DB, DB sends to cache first\n-> Use LRU eviction\n\nAnalytics - Naive solution\n\nWe keep a clicks counter per row, could we just increment it?\n\nWe would have to grab a lock/use atomic increment operation per row\n-> For super popular links this is too slow\n\nAnalytics - Stream Processing\n\nIdea: We can place individual data somewhere that doesn't require grabbing locks, and\nthen aggregate them later!\n\nOptions:\nDatabase -> relatively, slow\nIn memory message broker -> super fast, not durable\nLog Based message -> Basically writing to write ahead, durable\n\nCan use Kafka as messaging broker\n\nAnalytics - Click Consumer\n\nOptions:\nHDFS + Spark -> Batch job to aggregate clicks, may be too infrequent\nFlink -> Processes each event individually, may send too many writes to database\ndepending on implementation\nSpark Streaming -> Processes events in configurable mini-batch siz\n", "textAlign": "left", "verticalAlign": "top", "containerId": null, "originalText": "Hot Links -> basically use cache \n\nWrite back, can have write conflicts\nWrite through, slows down write speeds\nWrite around, causes initial cache miss best option for us\n-> Write to db first, as users read from DB, DB sends to cache first\n-> Use LRU eviction\n\nAnalytics - Naive solution\n\nWe keep a clicks counter per row, could we just increment it?\n\nWe would have to grab a lock/use atomic increment operation per row\n-> For super popular links this is too slow\n\nAnalytics - Stream Processing\n\nIdea: We can place individual data somewhere that doesn't require grabbing locks, and\nthen aggregate them later!\n\nOptions:\nDatabase -> relatively, slow\nIn memory message broker -> super fast, not durable\nLog Based message -> Basically writing to write ahead, durable\n\nCan use Kafka as messaging broker\n\nAnalytics - Click Consumer\n\nOptions:\nHDFS + Spark -> Batch job to aggregate clicks, may be too infrequent\nFlink -> Processes each event individually, may send too many writes to database\ndepending on implementation\nSpark Streaming -> Processes events in configurable mini-batch siz\n", "lineHeight": 1.3, "index": "aP", "autoResize": true }, { "type": "rectangle", "version": 2630, "versionNonce": 114627343, "isDeleted": false, "id": "K_9cYNKffaMoOerN9wVaT", "fillStyle": "solid", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 2, "opacity": 100, "angle": 0, "x": 2188.979807497199, "y": -24311.09380554676, "strokeColor": "#495057", "backgroundColor": "transparent", "width": 974.2373280901254, "height": 1013.2005798889625, "seed": 590160244, "groupIds": [], "frameId": null, "roundness": null, "boundElements": [], "updated": 1760909551420, "link": null, "locked": false, "index": "aQ" }, { "type": "text", "version": 2988, "versionNonce": 1258596705, "isDeleted": false, "id": "VxjrilE5Pwx4DVQq-8RE3", "fillStyle": "cross-hatch", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 2, "opacity": 100, "angle": 0, "x": 2204.9530020665966, "y": -24294.531905172396, "strokeColor": "#000", "backgroundColor": "#000", "width": 36, "height": 48.25979416180467, "seed": 1366348532, "groupIds": [], "frameId": null, "roundness": { "type": 2 }, "boundElements": [], "updated": 1760909551420, "link": null, "locked": false, "fontSize": 35.645664288188236, "fontFamily": 1, "text": "✨", "textAlign": "left", "verticalAlign": "top", "containerId": null, "originalText": "✨", "lineHeight": 1.3538755729626375, "index": "aR", "autoResize": true }, { "type": "text", "version": 3863, "versionNonce": 1409145135, "isDeleted": false, "id": "lczP7Z8V89jru47fWN_hC", "fillStyle": "solid", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 2, "opacity": 100, "angle": 0, "x": 2255.3055341914956, "y": -24281.362372468804, "strokeColor": "#495057", "backgroundColor": "#fff", "width": 240.30564880371094, "height": 21.448797405246523, "seed": 792876148, "groupIds": [], "frameId": null, "roundness": null, "boundElements": [], "updated": 1760909551420, "link": null, "locked": false, "fontSize": 17.159037924197218, "fontFamily": 1, "text": "High Level Design (continued)", "textAlign": "left", "verticalAlign": "top", "containerId": null, "originalText": "High Level Design (continued)", "lineHeight": 1.25, "index": "aS", "autoResize": true }, { "type": "line", "version": 2088, "versionNonce": 1447744833, "isDeleted": false, "id": "26qlWkcP5iw9zFgNuznX-", "fillStyle": "hachure", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 2, "opacity": 100, "angle": 0, "x": 2205.729544754014, "y": -24243.627736022394, "strokeColor": "#000000", "backgroundColor": "transparent", "width": 177.16767233958112, "height": 0.889654935972727, "seed": 711435764, "groupIds": [], "frameId": null, "roundness": { "type": 2 }, "boundElements": [], "updated": 1760909551420, "link": null, "locked": false, "startBinding": null, "endBinding": null, "lastCommittedPoint": null, "startArrowhead": null, "endArrowhead": null, "points": [ [ 0, 0 ], [ 177.16767233958112, 0.889654935972727 ] ], "index": "aT" }, { "type": "text", "version": 2700, "versionNonce": 677960527, "isDeleted": false, "id": "E-yex1G4-5pnP5RI3qPNe", "fillStyle": "solid", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 0, "opacity": 100, "angle": 0, "x": 2202.713806990277, "y": -24219.615542169326, "strokeColor": "#1e1e1e", "backgroundColor": "#fefefe", "width": 945.9962158203125, "height": 892.2699720582553, "seed": 132564852, "groupIds": [], "frameId": null, "roundness": null, "boundElements": [], "updated": 1760909551420, "link": null, "locked": false, "fontSize": 21.448797405246523, "fontFamily": 1, "text": "Analytics - Exactly Once?\n\nEvents are only processed exactly once internally \n\nOptions: Two Phase Commit (super slow) or Idempotency Key (scales poorly if\nmany publishes for same row)\n\nAnalytics - One Publisher per Row\n\nPartition by short URL\n\nWe can ensure that only one consumer is publishing clicks for a shortId at \ntime. Benefits include fewer idempotence keys to store, no need to grab locks on \npublish step\n\nDeleting Expired Links\n\nCan use batch job every x hours to check for expired links. (MySQL event scheduler)\n-> Only has to grab lock of row currently being read\n-> if currentTime > row.expiredTime:\n row.delete()\n\nPasteBin - Huge Pastes\n\nFor pastes that are multiple GB, we cannot store them in our DB (64kb limit for\nMySql and 4gb limit for PostgresSQL)\n-> Could store in an objector store or HDFS\n-> Object store likely preferable, cheaper, no batch jobs to run, don't need data locality\n-> CDNs will greatly improve latency, if the massive files are infrequent enough\na write through model could make sense.\n\nWriting in series allows us to avoid 2 phase commit", "textAlign": "left", "verticalAlign": "top", "containerId": null, "originalText": "Analytics - Exactly Once?\n\nEvents are only processed exactly once internally \n\nOptions: Two Phase Commit (super slow) or Idempotency Key (scales poorly if\nmany publishes for same row)\n\nAnalytics - One Publisher per Row\n\nPartition by short URL\n\nWe can ensure that only one consumer is publishing clicks for a shortId at \ntime. 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