{"id":4750,"date":"2016-07-23T23:45:36","date_gmt":"2016-07-23T23:45:36","guid":{"rendered":"http:\/\/www.garysieling.com\/blog\/?p=4750"},"modified":"2016-07-23T23:45:36","modified_gmt":"2016-07-23T23:45:36","slug":"importing-openlibrary-data-rethinkdb","status":"publish","type":"post","link":"https:\/\/www.garysieling.com\/blog\/importing-openlibrary-data-rethinkdb\/","title":{"rendered":"Importing OpenLibrary data into RethinkDB"},"content":{"rendered":"

You can download lists of books and authors from the Open Library1<\/a><\/sup>. The data dumps are formatted simply, as a tab separated file, with the last column being JSON data.<\/p>\n

\ntype - type of record (\/type\/edition, \/type\/work etc.)\nkey - unique key of the record. (\/books\/OL1M etc.)\nrevision - revision number of the record\nlast_modified - last modified timestamp\nJSON - the complete record in JSON format\n<\/pre>\n
To do this, you need to split the line, and parse the JSON data. <\/p>\n
\nimport * as r from 'rethinkdb';\n\nfunction parseLine(line: string) {\n  const columns = line.split(\"\\t\");\n  return {\n    type: columns[0],\n    data: columns[4]\n  }\n}\n\nfunction onError(err, result) {\n  if (err) throw err;\n}\n\nfunction run() {\n  const fs = require('fs'),\n        byline = require('byline');\n\n  r.connect( {host: 'localhost', port: 28015}, \n    function(err, conn) {\n      if (err) throw err;\n\n      const stream = byline(\n        fs.createReadStream('works.txt', { encoding: 'utf8' })\n      );\n      var options = {};\n\n      options['durability'] = 'soft';\n      options['returnChanges'] = false;\n\n      var lines = [];\n      function onRowComplete(line) {\n        r.db('openlibrary').table('works').insert(\n          JSON.parse(parseLine(line).data),\n          options\n        ).run(conn, onError)\n\n        lines = [];\n      }\n\n      stream.on('data', onRowComplete);\n    })\n}\n<\/pre>\n
The data files are quite large, so you need to be careful about memory allocation – make sure to not allocate too many objects in the process. The options set on the import make it run much faster.<\/p>\n
When you run it, you’ll also need to use memory settings for Node:<\/p>\n
\nnode --max_old_space_size=2000000 dist\/run.js\n<\/pre>\n
  1. https:\/\/openlibrary.org\/developers\/dumps [↩<\/a>]<\/span><\/li><\/ol>","protected":false},"excerpt":{"rendered":"
    Importing Open Library data into RethinkDB<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[12],"tags":[403,466],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t