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CODE

dejan / Twitter System Design example (public)

digraph twitter {
  node [shape=box, style=rounded];
  edge [color=gray];

// Services
  web [label="Web Server"];
  app [label="App Server"];
  api [label="API Server"];
  cache [label="Cache Server"];
  queue [label="Queue Server"];
  worker [label="Worker Server"];
  search [label="Search Server"];
  stream [label="Stream Server"];

// Databases
  tweet [label="Tweet DB", shape=cylinder];
  user [label="User DB", shape=cylinder];
  media [label="Media DB", shape=cylinder];
  index [label="Index DB", shape=cylinder];

// Edges
  web -> api [label="REST"];
  app -> api [label="REST"];
  api -> cache [label="read/write"];
  api -> queue [label="write"];
  api -> tweet [label="read/write"];
  api -> user [label="read/write"];
  api -> media [label="read/write"];
  api -> search [label="read"];
  api -> stream [label="read"];
  queue -> worker [label="read"];
  worker -> tweet [label="write"];
  worker -> user [label="write"];
  worker -> index [label="write"];
  search -> index [label="read"];
  stream -> tweet [label="read"];
}

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