WhatsApp

{ "type": "excalidraw", "version": 2, "source": "https://marketplace.visualstudio.com/items?itemName=pomdtr.excalidraw-editor", "elements": [ { "type": "text", "version": 564, "versionNonce": 1439624713, "isDeleted": false, "id": "VyJw-9UnVO85Ai-VUsjAZ", "fillStyle": "cross-hatch", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 1, "opacity": 100, "angle": 0, "x": 690.8715435729973, "y": 66.90072842692177, "strokeColor": "#000000", "backgroundColor": "#fff", "width": 665.927734375, "height": 46, "seed": 896043666, "groupIds": [], "frameId": null, "roundness": null, "boundElements": [], "updated": 1767422651424, "link": null, "locked": false, "fontSize": 36, "fontFamily": 1, "text": "Design Facebook Messenger/WhatsApp", "textAlign": "left", "verticalAlign": "top", "containerId": null, "originalText": "Design Facebook Messenger/WhatsApp", "lineHeight": 1.2777777777777777, "index": "a0", "autoResize": true }, { "type": "text", "version": 1941, "versionNonce": 273945415, "isDeleted": false, "id": "iIdO4f73th-8rX4KYwiIm", "fillStyle": "solid", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 0, "opacity": 100, "angle": 0, "x": 264.75891966469817, "y": 261.45353346486024, "strokeColor": "#1e1e1e", "backgroundColor": "#fefefe", "width": 421.9797058105469, "height": 175, "seed": 700324174, "groupIds": [], "frameId": null, "roundness": null, "boundElements": [], "updated": 1767422910292, "link": null, "locked": false, "fontSize": 20, "fontFamily": 5, "text": "Functional Req\n- Support group chats with up to 10 users\n- Send/receive messages\n- Send/receive media\n- Persist messages so that users can\naccess them from other devices/load other\nconversations", "textAlign": "left", "verticalAlign": "top", "containerId": null, "originalText": "Functional Req\n- Support group chats with up to 10 users\n- Send/receive messages\n- Send/receive media\n- Persist messages so that users can\naccess them from other devices/load other\nconversations", "lineHeight": 1.25, "index": "a4", "autoResize": true }, { "type": "text", "version": 5743, "versionNonce": 1675731625, "isDeleted": false, "id": "es-dVSBh_mMs5UJW248CZ", "fillStyle": "hachure", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 1, "opacity": 100, "angle": 0, "x": 1420.319190677082, "y": 248.8922723688779, "strokeColor": "#1e1e1e", "backgroundColor": "transparent", "width": 451.13970947265625, "height": 156, "seed": 887144462, "groupIds": [], "frameId": null, "roundness": null, "boundElements": [], "updated": 1767422711742, "link": null, "locked": false, "fontSize": 20, "fontFamily": 1, "text": "Back of Envelope Cal\n1. 1 bil total users\n2. Each user sends 100 messages a day\n3. Each message is around 100 bytes\n4. 1 bil * 100 msgs * 100 bytes = 10^13 bytes\n= 10 TB", "textAlign": "left", "verticalAlign": "top", "containerId": null, "originalText": "Back of Envelope Cal\n1. 1 bil total users\n2. Each user sends 100 messages a day\n3. Each message is around 100 bytes\n4. 1 bil * 100 msgs * 100 bytes = 10^13 bytes\n= 10 TB", "lineHeight": 1.3, "index": "a6", "autoResize": true }, { "type": "text", "version": 2211, "versionNonce": 1660537062, "isDeleted": false, "id": "lx2X8KGWP_0yUt_7O-27Z", "fillStyle": "solid", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 0, "opacity": 100, "angle": 0, "x": 264.5873660976803, "y": 539.8310297536218, "strokeColor": "#1e1e1e", "backgroundColor": "#fefefe", "width": 723.579345703125, "height": 832, "seed": 1083723858, "groupIds": [], "frameId": null, "roundness": null, "boundElements": [], "updated": 1767161171988, "link": null, "locked": false, "fontSize": 20, "fontFamily": 1, "text": "Chat Members Database\n\nWe should be able to fetch all chats for a given\nuser.\n-> Recall left pane of initial diagram\n-> Want all chatIds for given user to be on same shard, next\nto each other on disk\n\nuserId | chat Id\n3 | 12\n3 | 19\n10 | 12\n10 | 65\n\nAvoid causal dependency write conflict of adding/removing a user\nfrom a chat. Let's use single leader replication\n\nThis DB likely not a performance bottleneck, let's just use MySQL\n\nUsers Database\n\nSchema -> userId, email, passwordHash\n\npartition on userId <- hash range\n\nWhile this table will have a lot of rows, it is also unlikely to be\na bottleneck as it wil not be written to or read from nearly as much as\nour messages table will. Can also stick to MySQL here\n\n\n\n", "textAlign": "left", "verticalAlign": "top", "containerId": null, "originalText": "Chat Members Database\n\nWe should be able to fetch all chats for a given\nuser.\n-> Recall left pane of initial diagram\n-> Want all chatIds for given user to be on same shard, next\nto each other on disk\n\nuserId | chat Id\n3 | 12\n3 | 19\n10 | 12\n10 | 65\n\nAvoid causal dependency write conflict of adding/removing a user\nfrom a chat. Let's use single leader replication\n\nThis DB likely not a performance bottleneck, let's just use MySQL\n\nUsers Database\n\nSchema -> userId, email, passwordHash\n\npartition on userId <- hash range\n\nWhile this table will have a lot of rows, it is also unlikely to be\na bottleneck as it wil not be written to or read from nearly as much as\nour messages table will. Can also stick to MySQL here\n\n\n\n", "lineHeight": 1.3, "index": "aF", "autoResize": true }, { "type": "text", "version": 2952, "versionNonce": 1451501882, "isDeleted": false, "id": "fIfpwytlFPqBfGKoOa7wC", "fillStyle": "solid", "strokeWidth": 1, "strokeStyle": "solid", "roughness": 0, "opacity": 100, "angle": 0, "x": 248.05891105587102, "y": 1291.001523305962, "strokeColor": "#1e1e1e", "backgroundColor": "#fefefe", "width": 787.5993041992188, "height": 884, "seed": 278563726, "groupIds": [], "frameId": null, "roundness": null, "boundElements": [], "updated": 1767161212492, "link": null, "locked": false, "fontSize": 20, "fontFamily": 1, "text": "Messages table\n\nWe want to make sure that getting all the messages for a given chat\nis fast!\n\nSchema: chatId (partition key), timestamp (sort key), message, metadata\n 2 1000 \"Hiii\" From: Joe\n 2 1003 \"Yoo\" From: Jack\n\nMessages for chat already on same partition and pre-sorted!\nTimestamps ensure consistent ordering on all devices (order by TS on frontend)\n\nWhat should we optimize for?\n\nReads -> B-tree index, column oriented storage? (HBase)\n\nWrites -> LSM tree index, leader less replication (Cassandra?)\n\nMaybe we can get the benefits of HBase without having to worry about write\nthroughput!\n\nIt would be great to be able to read messages from HBase\nWhile being able to quickly ingest them in our system!\n-> We can use stream processing\n\nMessage Delivery\nClient -> Message service (Assign UUID) -> Kafka (partitioned on chatId)\n-> Flink (partition on chatId) -> upsert to HBase (partitioned on chatId)\n\nMessage Routing\nTo minimize load on client devices we want them to maintain as few active\nconnections as possible\n-> Each user can just maintain a connection with one chat server\n-> Chats at most have to be sent to 10 different places", "textAlign": "left", "verticalAlign": "top", "containerId": null, "originalText": "Messages table\n\nWe want to make sure that getting all the messages for a given chat\nis fast!\n\nSchema: chatId (partition key), timestamp (sort key), message, metadata\n 2 1000 \"Hiii\" From: Joe\n 2 1003 \"Yoo\" From: Jack\n\nMessages for chat already on same partition and pre-sorted!\nTimestamps ensure consistent ordering on all devices (order by TS on frontend)\n\nWhat should we optimize for?\n\nReads -> B-tree index, column oriented storage? (HBase)\n\nWrites -> LSM tree index, leader less replication (Cassandra?)\n\nMaybe we can get the benefits of HBase without having to worry about write\nthroughput!\n\nIt would be great to be able to read messages from HBase\nWhile being able to quickly ingest them in our system!\n-> We can use stream processing\n\nMessage Delivery\nClient -> Message service (Assign UUID) -> Kafka (partitioned on chatId)\n-> Flink (partition on chatId) -> upsert to HBase (partitioned on chatId)\n\nMessage Routing\nTo minimize load on client devices we want them to maintain as few active\nconnections as possible\n-> Each user can just maintain a connection with one chat server\n-> Chats at most have to be sent to 10 different places", "lineHeight": 1.3, "index": "aK", "autoResize": true }, { "type": "text", "version": 1014, "versionNonce": 1747204902, "isDeleted": false, "id": "MRV16jbnCUJPBXMX5Q_93", "fillStyle": "solid", "strokeWidth": 2, "strokeStyle": "solid", "roughness": 1, "opacity": 100, "angle": 0, "x": 243.64437384467692, "y": 2183.857833689086, "strokeColor": "#1e1e1e", "backgroundColor": "transparent", "width": 754.7794189453125, "height": 450, "seed": 512095950, "groupIds": [], "frameId": null, "roundness": null, "boundElements": [], "updated": 1767161232781, "link": null, "locked": false, "fontSize": 20, "fontFamily": 1, "text": "Connection to Chat Servers\n\nWe need to reliably know the function to connect a given userId to\na server for:\n-> Sending messages\n-> Receiving messages\n\nUse consistent hashing/ZooKeeper for load balancers\n\nwhat if a server goes down? Can have server send occasional heartbeat to\nclient and zookeeper.\n-> Server goes down -> update consistent hashing function\n-> Clients try to reconnect through LB on random interval (jitter)\n -> Avoid thundering herd\n\nReal time bi-directional communication -> use WebSockets likely\n\n", "textAlign": "left", "verticalAlign": "top", "containerId": null, "originalText": "Connection to Chat Servers\n\nWe need to reliably know the function to connect a given userId to\na server for:\n-> Sending messages\n-> Receiving messages\n\nUse consistent hashing/ZooKeeper for load balancers\n\nwhat if a server goes down? Can have server send occasional heartbeat to\nclient and zookeeper.\n-> Server goes down -> update consistent hashing function\n-> Clients try to reconnect through LB on random interval (jitter)\n -> Avoid thundering herd\n\nReal time bi-directional communication -> use WebSockets likely\n\n", "lineHeight": 1.25, "index": "aP", "autoResize": true }, { "type": "text", "version": 1112, "versionNonce": 559868743, "isDeleted": false, "id": "kRDn7UAUkBYcCjNbIccNN", "fillStyle": "cross-hatch", "strokeWidth": 2, "strokeStyle": "solid", "roughness": 1, "opacity": 100, "angle": 0, "x": 1737.9260000610666, "y": 814.4124185916497, "strokeColor": "#000000", "backgroundColor": "#7950f2", "width": 36.5035400390625, "height": 20.425981820163486, "seed": 2075523538, "groupIds": [ "7W9BlsS3du1eaDKo7eih6", "k1p0VxrNYKBe0CG-qeLcP" ], "frameId": null, "roundness": null, "boundElements": [], "updated": 1767426058552, "link": null, "locked": false, "fontSize": 16.34078545613079, "fontFamily": 1, "text": 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