{"id":26452,"date":"2012-08-23T21:46:45","date_gmt":"2012-08-23T13:46:45","guid":{"rendered":"http:\/\/www.yankay.com\/?p=26452"},"modified":"2021-03-28T20:36:16","modified_gmt":"2021-03-28T12:36:16","slug":"google-dremel-rationale","status":"publish","type":"post","link":"http:\/\/yankay.com\/google-dremel-rationale\/","title":{"rendered":"Google Dremel \u539f\u7406 &#8211; \u5982\u4f55\u80fd3\u79d2\u5206\u67901PB"},"content":{"rendered":"<h3>\u7b80\u4ecb<\/h3>\n<p>Dremel \u662fGoogle \u7684\u201c\u4ea4\u4e92\u5f0f\u201d\u6570\u636e\u5206\u6790\u7cfb\u7edf\u3002\u53ef\u4ee5\u7ec4\u5efa\u6210\u89c4\u6a21\u4e0a\u5343\u7684\u96c6\u7fa4\uff0c\u5904\u7406PB\u7ea7\u522b\u7684\u6570\u636e\u3002MapReduce\u5904\u7406\u4e00\u4e2a\u6570\u636e\uff0c\u9700\u8981\u5206\u949f\u7ea7\u7684\u65f6\u95f4\u3002\u4f5c\u4e3aMapReduce\u7684\u53d1\u8d77\u4eba\uff0cGoogle\u5f00\u53d1\u4e86Dremel\u5c06\u5904\u7406\u65f6\u95f4\u7f29\u77ed\u5230\u79d2\u7ea7\uff0c\u4f5c\u4e3aMapReduce\u7684\u6709\u529b\u8865\u5145\u3002Dremel\u4f5c\u4e3aGoogle BigQuery\u7684report\u5f15\u64ce\uff0c\u83b7\u5f97\u4e86\u5f88\u5927\u7684\u6210\u529f\u3002\u6700\u8fd1Apache\u8ba1\u5212\u63a8\u51faDremel\u7684\u5f00\u6e90\u5b9e\u73b0Drill\uff0c\u5c06Dremel\u7684\u6280\u672f\u53c8\u63a8\u5230\u4e86\u6d6a\u5c16\u4e0a\u3002<\/p>\n<h3>Google Dremel\u8bbe\u8ba1<\/h3>\n<p>\u6839\u636eGoogle\u516c\u5f00\u7684\u8bba\u6587\u300a<a href=\"http:\/\/research.google.com\/pubs\/pub36632.html\">Dremel: Interactive Analysis of WebScaleDatasets<\/a>\u300b\u53ef\u4ee5\u770b\u5230Dremel\u7684\u8bbe\u8ba1\u539f\u7406\u3002\u8fd8\u6709\u4e00\u4e9b\u6d4b\u8bd5\u62a5\u544a\u3002\u8bba\u6587\u5199\u4e8e2006\u5e74\uff0c\u516c\u5f00\u4e8e2010\u5e74\uff0cGoogle\u5728\u5904\u7406\u5927\u6570\u636e\u65b9\u9762\uff0c\u679c\u771f\u6709\u5f97\u5929\u72ec\u539a\u7684\u4f18\u52bf\u3002\u4e0b\u9762\u7684\u5185\u5bb9\uff0c\u5f88\u5927\u90e8\u5206\u6765\u81ea\u8fd9\u7bc7\u8bba\u6587\u3002<\/p>\n<p>\u968f\u7740Hadoop\u7684\u6d41\u884c\uff0c\u5927\u89c4\u6a21\u7684\u6570\u636e\u5206\u6790\u7cfb\u7edf\u5df2\u7ecf\u8d8a\u6765\u8d8a\u666e\u53ca\u3002\u6570\u636e\u5206\u6790\u5e08\u9700\u8981\u4e00\u4e2a\u80fd\u5c06\u6570\u636e\u201c\u73a9\u8f6c\u201d\u7684\u4ea4\u4e92\u5f0f\u7cfb\u7edf\u3002\u5982\u6b64\uff0c\u5c31\u53ef\u4ee5\u975e\u5e38\u65b9\u4fbf\u5feb\u6377\u7684\u6d4f\u89c8\u6570\u636e\uff0c\u5efa\u7acb\u5206\u6790\u6a21\u578b\u3002Dremel\u7cfb\u7edf\u6709\u4e0b\u9762\u51e0\u4e2a\u4e3b\u8981\u7684\u7279\u70b9\uff1a<\/p>\n<ul>\n<li><strong>Dremel<\/strong><strong>\u662f\u4e00\u4e2a\u5927\u89c4\u6a21\u7cfb\u7edf\u3002<\/strong>\u5728\u4e00\u4e2aPB\u7ea7\u522b\u7684\u6570\u636e\u96c6\u4e0a\u9762\uff0c\u5c06\u4efb\u52a1\u7f29\u77ed\u5230\u79d2\u7ea7\uff0c\u65e0\u7591\u9700\u8981\u5927\u91cf\u7684\u5e76\u53d1\u3002\u78c1\u76d8\u7684\u987a\u5e8f\u8bfb\u901f\u5ea6\u5728100MB\/S\u4e0a\u4e0b\uff0c\u90a3\u4e48\u57281S\u5185\u5904\u74061TB\u6570\u636e\uff0c\u610f\u5473\u7740\u81f3\u5c11\u9700\u8981\u67091\u4e07\u4e2a\u78c1\u76d8\u7684\u5e76\u53d1\u8bfb! Google\u4e00\u5411\u662f\u7528\u5ec9\u4ef7\u673a\u5668\u529e\u5927\u4e8b\u7684\u597d\u624b\u3002\u4f46\u662f\u673a\u5668\u8d8a\u591a\uff0c\u51fa\u95ee\u9898\u6982\u7387\u8d8a\u5927\uff0c\u5982\u6b64\u5927\u7684\u96c6\u7fa4\u89c4\u6a21\uff0c\u9700\u8981\u6709\u8db3\u591f\u7684\u5bb9\u9519\u8003\u8651\uff0c\u4fdd\u8bc1\u6574\u4e2a\u5206\u6790\u7684\u901f\u5ea6\u4e0d\u88ab\u96c6\u7fa4\u4e2d\u7684\u4e2a\u522b\u6162(\u574f)\u8282\u70b9\u5f71\u54cd\u3002<\/li>\n<li><strong>Dremel<\/strong><strong>\u662fMR<\/strong><strong>\u4ea4\u4e92\u5f0f\u67e5\u8be2\u80fd\u529b\u4e0d\u8db3\u7684\u8865\u5145\u3002<\/strong>\u548cMapReduce\u4e00\u6837\uff0cDremel\u4e5f\u9700\u8981\u548c\u6570\u636e\u8fd0\u884c\u5728\u4e00\u8d77\uff0c\u5c06\u8ba1\u7b97\u79fb\u52a8\u5230\u6570\u636e\u4e0a\u9762\u3002\u6240\u4ee5\u5b83\u9700\u8981GFS\u8fd9\u6837\u7684\u6587\u4ef6\u7cfb\u7edf\u4f5c\u4e3a\u5b58\u50a8\u5c42\u3002\u5728\u8bbe\u8ba1\u4e4b\u521d\uff0cDremel\u5e76\u975e\u662fMapReduce\u7684\u66ff\u4ee3\u54c1\uff0c\u5b83\u53ea\u662f\u53ef\u4ee5\u6267\u884c\u975e\u5e38\u5feb\u7684\u5206\u6790\uff0c\u5728\u4f7f\u7528\u7684\u65f6\u5019\uff0c\u5e38\u5e38\u7528\u5b83\u6765\u5904\u7406MapReduce\u7684\u7ed3\u679c\u96c6\u6216\u8005\u7528\u6765\u5efa\u7acb\u5206\u6790\u539f\u578b\u3002<\/li>\n<li><strong>Dremel<\/strong><strong>\u7684\u6570\u636e\u6a21\u578b\u662f\u5d4c\u5957(nested)<\/strong><strong>\u7684\u3002<\/strong>\u4e92\u8054\u7f51\u6570\u636e\u5e38\u5e38\u662f\u975e\u5173\u7cfb\u578b\u7684\u3002Dremel\u8fd8\u9700\u8981\u6709\u4e00\u4e2a\u7075\u6d3b\u7684\u6570\u636e\u6a21\u578b\uff0c\u8fd9\u4e2a\u6570\u636e\u6a21\u578b\u81f3\u5173\u91cd\u8981\u3002Dremel\u652f\u6301\u4e00\u4e2a\u5d4c\u5957(nested)\u7684\u6570\u636e\u6a21\u578b\uff0c\u7c7b\u4f3c\u4e8eJson\u3002\u800c\u4f20\u7edf\u7684\u5173\u7cfb\u6a21\u578b\uff0c\u7531\u4e8e\u4e0d\u53ef\u907f\u514d\u7684\u6709\u5927\u91cf\u7684Join\u64cd\u4f5c\uff0c\u5728\u5904\u7406\u5982\u6b64\u5927\u89c4\u6a21\u7684\u6570\u636e\u7684\u65f6\u5019\uff0c\u5f80\u5f80\u662f\u6709\u5fc3\u65e0\u529b\u7684\u3002<\/li>\n<li><strong>Dremel<\/strong><strong>\u4e2d\u7684\u6570\u636e\u662f\u7528\u5217\u5f0f\u5b58\u50a8\u7684\u3002<\/strong>\u4f7f\u7528\u5217\u5f0f\u5b58\u50a8\uff0c\u5206\u6790\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u53ea\u626b\u63cf\u9700\u8981\u7684\u90a3\u90e8\u5206\u6570\u636e\u7684\u65f6\u5019\uff0c\u51cf\u5c11CPU\u548c\u78c1\u76d8\u7684\u8bbf\u95ee\u91cf\u3002\u540c\u65f6\u5217\u5f0f\u5b58\u50a8\u662f\u538b\u7f29\u53cb\u597d\u7684\uff0c\u4f7f\u7528\u538b\u7f29\uff0c\u53ef\u4ee5\u7efc\u5408CPU\u548c\u78c1\u76d8\uff0c\u53d1\u6325\u6700\u5927\u7684\u6548\u80fd\u3002\u5bf9\u4e8e\u5173\u7cfb\u578b\u6570\u636e\uff0c\u5982\u679c\u4f7f\u7528\u5217\u5f0f\u5b58\u50a8\uff0c\u6211\u4eec\u90fd\u5f88\u6709\u7ecf\u9a8c\u3002\u4f46\u662f\u5bf9\u4e8e\u5d4c\u5957(nested)\u7684\u7ed3\u6784\uff0cDremel\u4e5f\u53ef\u4ee5\u7528\u5217\u5b58\u50a8\uff0c\u975e\u5e38\u503c\u5f97\u6211\u4eec\u5b66\u4e60\u3002<\/li>\n<li><strong>Dremel<\/strong><strong>\u7ed3\u5408\u4e86Web<\/strong><strong>\u641c\u7d22 <\/strong><strong>\u548c\u5e76\u884cDBMS<\/strong><strong>\u7684\u6280\u672f\u3002<\/strong>\u9996\u5148\uff0c\u4ed6\u501f\u9274\u4e86Web\u641c\u7d22\u4e2d\u7684\u201c\u67e5\u8be2\u6811\u201d\u7684\u6982\u5ff5\uff0c\u5c06\u4e00\u4e2a\u76f8\u5bf9\u5de8\u5927\u590d\u6742\u7684\u67e5\u8be2\uff0c\u5206\u5272\u6210\u8f83\u5c0f\u8f83\u7b80\u5355\u7684\u67e5\u8be2\u3002\u5927\u4e8b\u5316\u5c0f\uff0c\u5c0f\u4e8b\u5316\u4e86\uff0c\u80fd\u5e76\u53d1\u7684\u5728\u5927\u91cf\u8282\u70b9\u4e0a\u8dd1\u3002\u5176\u6b21\uff0c\u548c\u5e76\u884cDBMS\u7c7b\u4f3c\uff0cDremel\u53ef\u4ee5\u63d0\u4f9b\u4e86\u4e00\u4e2aSQL-like\u7684\u63a5\u53e3\uff0c\u5c31\u50cfHive\u548cPig\u90a3\u6837\u3002<\/li>\n<\/ul>\n<h4>Google Dremel\u5e94\u7528\u573a\u666f<\/h4>\n<p>\u8bbe\u60f3\u4e00\u4e2a\u4f7f\u7528\u573a\u666f\u3002\u6211\u4eec\u7684\u7f8e\u5973\u6570\u636e\u5206\u6790\u5e08\uff0c\u5979\u6709\u4e00\u4e2a\u65b0\u7684\u60f3\u6cd5\u8981\u9a8c\u8bc1\u3002\u8981\u9a8c\u8bc1\u5979\u7684\u60f3\u6cd5\uff0c\u9700\u8981\u5728\u4e00\u4e2a\u4e0a\u4ebf\u6761\u6570\u636e\u4e0a\u9762\uff0c\u8dd1\u4e00\u4e2a\u67e5\u8be2\uff0c\u770b\u770b\u7ed3\u679c\u548c\u5979\u7684\u60f3\u6cd5\u662f\u4e0d\u662f\u4e00\u6837\uff0c\u5979\u53ef\u4e0d\u5e0c\u671b\u7b49\u592a\u957f\u65f6\u95f4\uff0c\u6700\u597d\u51e0\u79d2\u949f\u7ed3\u679c\u5c31\u51fa\u6765\u3002\u5f53\u7136\u5979\u7684\u60f3\u6cd5\u4e0d\u4e00\u5b9a\u5b8c\u5584\uff0c\u8fd8\u9700\u8981\u4e0d\u65ad\u8c03\u6574\u8bed\u53e5\u3002\u7136\u540e\u5979\u9a8c\u8bc1\u4e86\u60f3\u6cd5\uff0c\u53d1\u73b0\u4e86\u6570\u636e\u4e2d\u7684\u4ef7\u503c\u3002\u6700\u540e\uff0c\u5979\u53ef\u4ee5\u5c06\u8fd9\u4e2a\u8bed\u53e5\u5b8c\u5584\u6210\u4e00\u4e2a\u957f\u671f\u8fd0\u884c\u7684\u4efb\u52a1\u3002<\/p>\n<p>\u5bf9\u4e8eGoogle,\u6570\u636e\u4e00\u5f00\u59cb\u662f\u653e\u5728GFS\u4e0a\u7684\u3002\u53ef\u4ee5\u901a\u8fc7MapReduce\u5c06\u6570\u636e\u5bfc\u5165\u5230Dremel\u4e2d\u53bb\uff0c\u5728\u8fd9\u4e9bMapReduce\u4e2d\u8fd8\u53ef\u4ee5\u505a\u4e00\u4e9b\u5904\u7406\u3002\u7136\u540e\u5206\u6790\u5e08\u4f7f\u7528Dremel\uff0c\u8f7b\u677e\u6109\u60a6\u7684\u5206\u6790\u6570\u636e\uff0c\u5efa\u7acb\u6a21\u578b\u3002\u6700\u540e\u53ef\u4ee5\u7f16\u5236\u6210\u4e00\u4e2a\u957f\u671f\u8fd0\u884c\u7684MapReduce\u4efb\u52a1\u3002<\/p>\n<p>\u8fd9\u79cd\u5904\u7406\u65b9\u5f0f\uff0c\u8ba9\u7b14\u8005\u8054\u60f3\u5230Greenplum\u7684<a href=\"http:\/\/www.greenplum.com\/products\/chorus\">Chorus<\/a>. Chorus\u4e5f\u53ef\u4ee5\u4e3a\u5206\u6790\u5e08\u63d0\u4f9b\u5feb\u901f\u7684\u6570\u636e\u67e5\u8be2\uff0c\u4e0d\u8fc7\u89e3\u51b3\u65b9\u6848\u662f\u901a\u8fc7\u9884\u5904\u7406\uff0c\u5bfc\u5165\u90e8\u5206\u6570\u636e\uff0c\u51cf\u5c11\u6570\u636e\u96c6\u7684\u5927\u5c0f\u3002\u7528\u7684\u662f\u4e09\u5341\u516d\u8ba1\uff0c\u8d70\u4e3a\u4e0a\u8ba1\uff0c\u907f\u5f00\u7684\u77ac\u65f6\u5206\u6790\u5927\u6570\u636e\u7684\u96be\u9898\u3002Chorus\u6700\u8fd1\u5373\u5c06\u5f00\u6e90\uff0c\u53ef\u4ee5\u5173\u6ce8\u4e0b\u3002<\/p>\n<p>\u8fd8\u6709\u4e00\u70b9\u7279\u522b\u7684\u5c31\u662f\u6309\u5217\u5b58\u50a8\u7684\u5d4c\u5957\u6570\u636e\u683c\u5f0f\u3002\u5982\u56fe\u6240\u793a\uff0c\u5728\u6309\u8bb0\u5f55\u5b58\u50a8\u7684\u6a21\u5f0f\u4e2d\uff0c\u4e00\u4e2a\u8bb0\u5f55\u7684\u591a\u5217\u662f\u8fde\u7eed\u7684\u5199\u5728\u4e00\u8d77\u7684\u3002\u5728\u6309\u5217\u5b58\u50a8\u4e2d\uff0c\u53ef\u4ee5\u5c06\u6570\u636e\u6309\u5217\u5206\u5f00\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u53ef\u4ee5\u4ec5\u4ec5\u626b\u63cfA.B.C\u800c\u4e0d\u53bb\u8bfbA.E\u6216\u8005A.B.C\u3002\u96be\u70b9\u5728\u4e8e\uff0c\u6211\u4eec\u5982\u4f55\u80fd\u540c\u65f6\u9ad8\u6548\u5730\u626b\u63cf\u82e5\u5e72\u5217\uff0c\u5e76\u505a\u4e00\u4e9b\u5206\u6790\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-27246\" src=\"http:\/\/47.100.65.109\/wp-content\/uploads\/2012\/08\/2012111251-300x148.jpeg\" alt=\"\" width=\"300\" height=\"148\" srcset=\"http:\/\/yankay.com\/wp-content\/uploads\/2012\/08\/2012111251-300x148.jpeg 300w, http:\/\/yankay.com\/wp-content\/uploads\/2012\/08\/2012111251.jpeg 500w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<h4>Google Dremel\u6570\u636e\u6a21\u578b<\/h4>\n<p>\u5728Google, \u7528Protocol Buffer\u5e38\u5e38\u4f5c\u4e3a\u5e8f\u5217\u5316\u7684\u65b9\u6848\u3002\u5176\u6570\u636e\u6a21\u578b\u53ef\u4ee5\u7528\u6570\u5b66\u65b9\u6cd5\u4e25\u683c\u7684\u8868\u793a\u5982\u4e0b\uff1a<\/p>\n<p>$$!t=dom |&lt;a_1:t[*|?],&#8230;,a_n:t[*|?]&gt;$$&lt;\/a_1:t[*|?],&#8230;,a_n:t[*|?]&gt;<\/p>\n<p>\u5176\u4e2dt\u53ef\u4ee5\u662f\u4e00\u4e2a\u57fa\u672c\u7c7b\u578b\u6216\u8005\u7ec4\u5408\u7c7b\u578b\u3002\u5176\u4e2d\u57fa\u672c\u7c7b\u578b\u53ef\u4ee5\u662finteger,float\u548cstring\u3002\u7ec4\u5408\u7c7b\u578b\u53ef\u4ee5\u662f\u82e5\u5e72\u4e2a\u57fa\u672c\u7c7b\u578b\u62fc\u51d1\u3002\u661f\u53f7(*)\u6307\u7684\u662f\u4efb\u4f55\u7c7b\u578b\u90fd\u53ef\u4ee5\u91cd\u590d\uff0c\u5c31\u662f\u6570\u7ec4\u4e00\u6837\u3002\u95ee\u53f7(?)\u6307\u7684\u662f\u4efb\u610f\u7c7b\u578b\u90fd\u662f\u53ef\u4ee5\u662f\u53ef\u9009\u7684\u3002\u7b80\u5355\u6765\u8bf4\uff0c\u9664\u4e86\u6ca1\u6709Map\u5916\uff0c\u548c\u4e00\u4e2aJson\u51e0\u4e4e\u6ca1\u6709\u533a\u522b\u3002<\/p>\n<p>\u4e0b\u56fe\u662f\u4f8b\u5b50\uff0cSchema\u5b9a\u4e49\u4e86\u4e00\u4e2a\u7ec4\u5408\u7c7b\u578bDocument.\u6709\u4e00\u4e2a\u5fc5\u9009\u5217DocId\uff0c\u53ef\u9009\u5217Links\uff0c\u8fd8\u6709\u4e00\u4e2a\u6570\u7ec4\u5217Name\u3002\u53ef\u4ee5\u7528Name.Language.Code\u6765\u8868\u793aCode\u5217\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-27247\" src=\"http:\/\/47.100.65.109\/wp-content\/uploads\/2012\/08\/2012111252-300x214.jpeg\" alt=\"\" width=\"300\" height=\"214\" srcset=\"http:\/\/yankay.com\/wp-content\/uploads\/2012\/08\/2012111252-300x214.jpeg 300w, http:\/\/yankay.com\/wp-content\/uploads\/2012\/08\/2012111252.jpeg 500w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>\u8fd9\u79cd\u6570\u636e\u683c\u5f0f\u662f\u8bed\u8a00\u65e0\u5173\uff0c\u5e73\u53f0\u65e0\u5173\u7684\u3002\u53ef\u4ee5\u4f7f\u7528Java\u6765\u5199MR\u7a0b\u5e8f\u6765\u751f\u6210\u8fd9\u4e2a\u683c\u5f0f\uff0c\u7136\u540e\u7528C++\u6765\u8bfb\u53d6\u3002\u5728\u8fd9\u79cd\u5217\u5f0f\u5b58\u50a8\u4e2d\uff0c\u80fd\u591f\u5feb\u901f\u901a\u7528\u5904\u7406\u4e5f\u662f\u975e\u5e38\u7684\u91cd\u8981\u7684\u3002<\/p>\n<p>\u4e0a\u56fe\uff0c\u662f\u4e00\u4e2a\u793a\u4f8b\u6570\u636e\u7684\u62bd\u8c61\u7684\u6a21\u578b\uff1b\u4e0b\u56fe\u662f\u8fd9\u4efd\u6570\u636e\u5728Dremel\u5b9e\u9645\u7684\u5b58\u50a8\u7684\u683c\u5f0f\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-27249\" src=\"http:\/\/47.100.65.109\/wp-content\/uploads\/2012\/08\/2012111253-300x201.jpeg\" alt=\"\" width=\"300\" height=\"201\" srcset=\"http:\/\/yankay.com\/wp-content\/uploads\/2012\/08\/2012111253-300x201.jpeg 300w, http:\/\/yankay.com\/wp-content\/uploads\/2012\/08\/2012111253.jpeg 500w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>\u5982\u679c\u662f\u5173\u7cfb\u578b\u6570\u636e\uff0c\u800c\u4e0d\u662f\u5d4c\u5957\u7684\u7ed3\u6784\u3002\u5b58\u50a8\u7684\u65f6\u5019\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u6bcf\u4e00\u5217\u7684\u503c\u76f4\u63a5\u6392\u5217\u4e0b\u6765\uff0c\u4e0d\u7528\u5f15\u5165\u5176\u4ed6\u7684\u6982\u5ff5\uff0c\u4e5f\u4e0d\u4f1a\u4e22\u5931\u6570\u636e\u3002\u5bf9\u4e8e\u5d4c\u5957\u7684\u7ed3\u6784\uff0c\u6211\u4eec\u8fd8\u9700\u8981\u4e24\u4e2a\u53d8\u91cfR (Repetition Level) ,D (Definition Level) \u624d\u80fd\u5b58\u50a8\u5176\u5b8c\u6574\u7684\u4fe1\u606f\u3002<\/p>\n<p><strong>Repetition Level<\/strong>\u662f\u8bb0\u5f55\u8be5\u5217\u7684\u503c\u662f\u5728\u54ea\u4e00\u4e2a\u7ea7\u522b\u4e0a\u91cd\u590d\u7684\u3002\u4e3e\u4e2a\u4f8b\u5b50\u8bf4\u660e\uff1a\u5bf9\u4e8eName.Language.Code? \u6211\u4eec\u4e00\u5171\u6709\u4e09\u6761\u975eNull\u7684\u8bb0\u5f55\u3002<\/p>\n<ol>\n<li>\u7b2c\u4e00\u4e2a\u662f\u201den-us\u201d\uff0c\u51fa\u73b0\u5728\u7b2c\u4e00\u4e2aName\u7684\u7b2c\u4e00\u4e2aLanuage\u7684\u7b2c\u4e00\u4e2aCode\u91cc\u9762\u3002\u5728\u6b64\u4e4b\u524d\uff0c\u8fd9\u4e09\u4e2a\u5143\u7d20\u662f\u6ca1\u6709\u91cd\u590d\u8fc7\u7684\uff0c\u90fd\u662f\u7b2c\u4e00\u4e2a\u3002\u6240\u4ee5\u5176R\u4e3a0\u3002<\/li>\n<li>\u7b2c\u4e8c\u4e2a\u662f\u201den\u201d\uff0c\u51fa\u73b0\u5728\u4e0b\u4e00\u4e2aLanuage\u91cc\u9762\u3002\u4e5f\u5c31\u662f\u8bf4Lanague\u662f\u91cd\u590d\u7684\u5143\u7d20\u3002Name.Language.Code\u4e2dLanague\u6392\u7b2c\u4e8c\u4e2a\uff0c\u6240\u4ee5\u5176R\u4e3a2.<\/li>\n<li>\u7b2c\u4e09\u4e2a\u662f\u201den-gb\u201d\uff0c\u51fa\u73b0\u5728\u4e0b\u4e00\u4e2aName\u4e2d\uff0cName\u662f\u91cd\u590d\u5143\u7d20\uff0c\u6392\u7b2c\u4e00\u4e2a\uff0c\u6240\u4ee5\u5176R\u4e3a1\u3002<\/li>\n<\/ol>\n<p>\u6211\u4eec\u53ef\u4ee5\u60f3\u8c61\uff0c\u5c06\u6240\u6709\u7684\u6ca1\u6709\u503c\u7684\u5217\uff0c\u8bbe\u503c\u4e3aNULL\u3002\u5982\u679c\u662f\u6570\u7ec4\u5217\uff0c\u6211\u4eec\u4e5f\u60f3\u8c61\u6709\u4e00\u4e2aNULL\u503c\u3002\u6709\u4e86Repetition Level\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u5f88\u597d\u7684\u7528\u5217\u8868\u793a\u5d4c\u5957\u7684\u7ed3\u6784\u4e86\u3002\u4f46\u662f\u8fd8\u6709\u4e00\u70b9\u4e0d\u8db3\u3002\u5c31\u662f\u8fd8\u9700\u8981\u8868\u793a\u4e00\u4e2a\u6570\u7ec4\u662f\u4e0d\u662f\u6211\u4eec\u60f3\u8c61\u51fa\u6765\u7684\u3002<\/p>\n<p><strong>Definition Level<\/strong> \u662f\u5b9a\u4e49\u7684\u6df1\u5ea6\uff0c\u7528\u6765\u8bb0\u5f55\u8be5\u5217\u662f\u5426\u662f\u201d\u60f3\u8c61\u201d\u51fa\u6765\u7684\u3002\u6240\u4ee5\u5bf9\u4e8e\u975eNULL\u7684\u8bb0\u5f55\uff0c\u662f\u6ca1\u6709\u610f\u4e49\u7684\uff0c\u5176\u503c\u5fc5\u7136\u4e3a\u76f8\u540c\u3002\u540c\u6837\u4e3e\u4e2a\u4f8b\u5b50\u3002\u4f8b\u5982Name.Language.Country,<\/p>\n<ul>\n<li>\u7b2c\u4e00\u4e2a\u201dus\u201d\u662f\u5728R1\u91cc\u9762\uff0c\u5176\u4e2dName,Language,Country\u662f\u6709\u5b9a\u4e49\u7684\u3002\u6240\u4ee5D\u4e3a3\u3002<\/li>\n<li>\u7b2c\u4e8c\u4e2a\u201dNULL\u201d\u4e5f\u662f\u5728R1\u7684\u91cc\u9762\uff0c\u5176\u4e2dName,Language\u662f\u6709\u5b9a\u4e49\u7684,\u5176\u4ed6\u662f\u60f3\u8c61\u7684\u3002\u6240\u4ee5D\u4e3a2\u3002<\/li>\n<li>\u7b2c\u4e09\u4e2a\u201dNULL\u201d\u8fd8\u662f\u5728R1\u7684\u91cc\u9762\uff0c\u5176\u4e2dName\u662f\u6709\u5b9a\u4e49\u7684,\u5176\u4ed6\u662f\u60f3\u8c61\u7684\u3002\u6240\u4ee5D\u4e3a1\u3002<\/li>\n<li>\u7b2c\u56db\u4e2a\u201dgb\u201d\u662f\u5728R1\u91cc\u9762\uff0c\u5176\u4e2dName,Language,Country\u662f\u6709\u5b9a\u4e49\u7684\u3002\u6240\u4ee5D\u4e3a3\u3002<\/li>\n<\/ul>\n<p>\u5c31\u662f\u8fd9\u6837\uff0c\u5982\u679c\u8def\u5f84\u4e2d\u6709required\uff0c\u53ef\u4ee5\u5c06\u5176\u51cf\u53bb\uff0c\u56e0\u4e3arequired\u5fc5\u7136\u4f1adefine\uff0c\u8bb0\u5f55\u5176\u6570\u91cf\u6ca1\u6709\u610f\u4e49\u3002<\/p>\n<p>\u7406\u89e3\u4e86\u5982\u4f55\u5b58\u50a8\u8fd9\u79cd\u5d4c\u5957\u7ed3\u6784\u3002\u5199\u6ca1\u6709\u96be\u5ea6\u3002\u8bfb\u7684\u65f6\u5019\uff0c\u6211\u4eec\u53ea\u8bfb\u5176\u4e2d\u90e8\u5206\u5b57\u6bb5\uff0c\u6765\u6784\u5efa\u90e8\u5206\u7684\u6570\u636e\u6a21\u578b\u3002\u4f8b\u5982\uff0c\u53ea\u8bfb\u53d6DocID\u548cName.Language.Country\u3002\u6211\u4eec\u53ef\u4ee5\u540c\u65f6\u626b\u63cf\u4e24\u4e2a\u5b57\u6bb5\uff0c\u5148\u626b\u63cfDocID\u3002\u8bb0\u5f55\u4e0b\u7b2c\u4e00\u4e2a\uff0c\u7136\u540e\u53d1\u73b0\u4e0b\u4e00\u4e2aDocID\u7684R\u662f0\uff1b\u4e8e\u662f\u8be5\u8bfbName.Language.Country\uff0c\u5982\u679c\u4e0b\u4e00\u4e2aR\u662f1\u6216\u80052\u5c31\u7ee7\u7eed\u8bfb\uff0c\u5982\u679c\u662f0\u5c31\u5f00\u59cb\u8bfb\u4e0b\u4e00\u4e2aDocID\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-27250\" src=\"http:\/\/47.100.65.109\/wp-content\/uploads\/2012\/08\/2012111254-300x133.jpeg\" alt=\"\" width=\"300\" height=\"133\" srcset=\"http:\/\/yankay.com\/wp-content\/uploads\/2012\/08\/2012111254-300x133.jpeg 300w, http:\/\/yankay.com\/wp-content\/uploads\/2012\/08\/2012111254.jpeg 500w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>\u4e0b\u56fe\u5c55\u793a\u4e86\u4e00\u4e2a\u66f4\u4e3a\u590d\u6742\u7684\u8bfb\u53d6\u7684\u72b6\u6001\u673a\u793a\u4f8b\u3002\u5728\u8bfb\u53d6\u8fc7\u7a0b\u4e2d\u4f7f\u7528\u4e86Definition Level\u6765\u5feb\u901fJump,\u63d0\u5347\u6027\u80fd\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-27251\" src=\"http:\/\/47.100.65.109\/wp-content\/uploads\/2012\/08\/2012111255-300x180.jpeg\" alt=\"\" width=\"300\" height=\"180\" srcset=\"http:\/\/yankay.com\/wp-content\/uploads\/2012\/08\/2012111255-300x180.jpeg 300w, http:\/\/yankay.com\/wp-content\/uploads\/2012\/08\/2012111255.jpeg 500w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>\u5230\u6b64\u4e3a\u6b62\uff0c\u6211\u4eec\u5df2\u7ecf\u77e5\u9053\u4e86Dremel\u7684\u6570\u636e\u7ed3\u6784\u3002\u5c31\u50cf\u5176\u4ed6\u6570\u636e\u5206\u6790\u7cfb\u7edf\u4e00\u6837\uff0c\u6570\u636e\u7ed3\u6784\u786e\u5b9a\u4e0b\u6765\uff0c\u529f\u80fd\u5c31\u51b3\u5b9a\u4e86\u4e00\u5927\u534a\u3002\u5bf9\u4e8eDremel\u7684\u6570\u636e\u67e5\u8be2\uff0c\u5fc5\u7136\u662f\u201c\u5168\u8868\u626b\u63cf\u201d\uff0c\u4f46\u7531\u4e8e\u5176\u5de7\u5999\u7684\u5217\u5b58\u50a8\u8bbe\u8ba1\uff0c\u826f\u597d\u7684\u6570\u636e\u6a21\u578b\u8bbe\u8ba1\u53ef\u4ee5\u56de\u907f\u6389\u5927\u90e8\u5206Join\u9700\u6c42\u548c\u626b\u63cf\u6700\u5c11\u7684\u5217\u3002<\/p>\n<h4>Google Dremel\u67e5\u8be2\u65b9\u5f0f<\/h4>\n<p>Dremel\u53ef\u4ee5\u4f7f\u7528\u4e00\u79cdSQL-like\u7684\u8bed\u6cd5\u67e5\u8be2\u5d4c\u5957\u6570\u636e\u3002\u7531\u4e8eDremel\u7684\u6570\u636e\u662f\u53ea\u8bfb\u7684\uff0c\u5e76\u4e14\u4f1a\u5bc6\u96c6\u7684\u53d1\u8d77\u591a\u6b21\u7c7b\u4f3c\u7684\u8bf7\u6c42\u3002\u6240\u4ee5\u53ef\u4ee5\u4fdd\u7559\u4e0a\u6b21\u8bf7\u6c42\u7684\u4fe1\u606f\uff0c\u8fd8\u4f18\u5316\u4e0b\u6b21\u8bf7\u6c42\u7684explain\u8fc7\u7a0b\u3002\u90a3\u53c8\u662f\u5982\u4f55explain\u7684\u5462\uff1f<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-27252\" src=\"http:\/\/47.100.65.109\/wp-content\/uploads\/2012\/08\/2012111256-300x191.jpeg\" alt=\"\" width=\"300\" height=\"191\" srcset=\"http:\/\/yankay.com\/wp-content\/uploads\/2012\/08\/2012111256-300x191.jpeg 300w, http:\/\/yankay.com\/wp-content\/uploads\/2012\/08\/2012111256.jpeg 500w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>\u8fd9\u662f\u4e00\u4e2a\u6811\u72b6\u67b6\u6784\u3002\u5f53Client\u53d1\u5176\u4e00\u4e2a\u8bf7\u6c42\uff0c\u6839\u8282\u70b9\u53d7\u5230\u8bf7\u6c42\uff0c\u6839\u636emetadata\uff0c\u5c06\u5176\u5206\u89e3\u5230\u679d\u53f6\uff0c\u76f4\u5230\u5230\u4f4d\u4e8e\u6570\u636e\u4e0a\u9762\u7684\u53f6\u5b50Server\u3002\u4ed6\u4eec\u626b\u63cf\u5904\u7406\u6570\u636e\uff0c\u53c8\u4e0d\u65ad\u6c47\u603b\u5230\u6839\u8282\u70b9\u3002<\/p>\n<p>\u4e3e\u4e2a\u4f8b\u5b50\uff1a\u5bf9\u4e8e\u8bf7\u6c42\uff1a<\/p>\n<pre>SELECT A, COUNT(B) FROM T GROUP BY A<\/pre>\n<p>\u6839\u8282\u70b9\u6536\u5230\u8bf7\u6c42\uff0c\u4f1a\u6839\u636e\u6570\u636e\u7684\u5206\u533a\u8bf7\u6c42\uff0c\u5c06\u8bf7\u6c42\u53d8\u6210\u53ef\u4ee5\u62c6\u5206\u7684\u6837\u5b50\u3002\u539f\u6765\u7684\u8bf7\u6c42\u4f1a\u53d8\u4e3a\u3002<\/p>\n<pre>SELECT A, SUM(c) FROM (R1 UNION ALL ... Rn) GROUP BY A<\/pre>\n<p>R1,\u2026RN\u662fT\u7684\u5206\u533a\u8ba1\u7b97\u51fa\u7684\u7ed3\u679c\u96c6\u3002\u8d8a\u5927\u7684\u8868\u6709\u8d8a\u591a\u7684\u5206\u533a\uff0c\u8d8a\u591a\u7684\u5206\u533a\u53ef\u4ee5\u8d8a\u597d\u7684\u652f\u6301\u5e76\u53d1\u3002<\/p>\n<p>\u7136\u540e\u518d\u5c06\u8bf7\u6c42\u5207\u5206\uff0c\u53d1\u9001\u5230\u6bcf\u4e2a\u5206\u533a\u7684\u53f6\u5b50Server\u4e0a\u9762\u53bb,\u5bf9\u4e8e\u6bcf\u4e2aServer<\/p>\n<pre>?Ri = SELECT A, COUNT(B) AS c FROM Ti GROUP BY A<\/pre>\n<p>\u7ed3\u6784\u96c6\u4e00\u5b9a\u4f1a\u6bd4\u539f\u59cb\u6570\u636e\u5c0f\u5f88\u591a\uff0c\u5904\u7406\u8d77\u6765\u4e5f\u66f4\u5feb\u3002\u6839\u670d\u52a1\u5668\u53ef\u4ee5\u5f88\u5feb\u7684\u5c06\u6570\u636e\u6c47\u603b\u3002\u5177\u4f53\u7684\u805a\u5408\u65b9\u5f0f\uff0c\u53ef\u4ee5\u4f7f\u7528\u73b0\u6709\u7684\u5e76\u884c\u6570\u636e\u5e93\u6280\u672f\u3002<\/p>\n<p>Dremel\u662f\u4e00\u4e2a\u591a\u7528\u6237\u7684\u7cfb\u7edf\u3002\u5207\u5272\u5206\u914d\u4efb\u52a1\u7684\u65f6\u5019\uff0c\u8fd8\u9700\u8981\u8003\u8651\u7528\u6237\u4f18\u5148\u7ea7\u548c\u8d1f\u8f7d\u5747\u8861\u3002\u5bf9\u4e8e\u5927\u578b\u7cfb\u7edf\uff0c\u8fd8\u9700\u8981\u8003\u8651\u5bb9\u9519\uff0c\u5982\u679c\u4e00\u4e2a\u53f6\u5b50Server\u51fa\u73b0\u6545\u969c\u6216\u53d8\u6162\uff0c\u4e0d\u80fd\u8ba9\u6574\u4e2a\u67e5\u8be2\u4e5f\u53d7\u5230\u660e\u663e\u5f71\u54cd\u3002<\/p>\n<p>\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u6bcf\u4e2a\u8ba1\u7b97\u8282\u70b9\uff0c\u6267\u884c\u591a\u4e2a\u4efb\u52a1\u3002\u4f8b\u5982\uff0c\u6280\u5de7\u4e2d\u67093000\u4e2a\u53f6\u5b50Server\uff0c\u6bcf\u4e2aServer\u4f7f\u75288\u4e2a\u7ebf\u7a0b\uff0c\u6709\u53ef\u4ee5\u670924000\u4e2a\u8ba1\u7b97\u5355\u5143\u3002\u5982\u679c\u4e00\u5f20\u8868\u53ef\u4ee5\u5212\u5206\u4e3a100000\u4e2a\u533a\uff0c\u5c31\u610f\u5473\u7740\u5927\u7ea6\u6bcf\u4e2a\u8ba1\u7b97\u5355\u5143\u9700\u8981\u8ba1\u7b975\u4e2a\u533a\u3002\u8fd9\u6267\u884c\u7684\u8fc7\u7a0b\u4e2d\uff0c\u5982\u679c\u67d0\u4e00\u4e2a\u8ba1\u7b97\u5355\u5143\u592a\u5fd9\uff0c\u5c31\u4f1a\u53e6\u5916\u542f\u4e00\u4e2a\u6765\u8ba1\u7b97\u3002\u8fd9\u4e2a\u8fc7\u7a0b\u662f\u52a8\u6001\u5206\u914d\u7684\u3002<\/p>\n<p>\u5bf9\u4e8eGFS\u8fd9\u6837\u7684\u5b58\u50a8\uff0c\u4e00\u4efd\u6570\u636e\u4e00\u822c\u67093\u4efd\u62f7\u8d1d\uff0c\u8ba1\u7b97\u5355\u5143\u5f88\u5bb9\u6613\u5c31\u80fd\u5206\u914d\u5230\u6570\u636e\u6240\u5728\u7684\u8282\u70b9\u4e0a\uff0c\u5178\u578b\u7684\u60c5\u51b5\u53ef\u4ee5\u5230\u8fbe95%\u7684\u547d\u4e2d\u7387\u3002<\/p>\n<p>Dremel\u8fd8\u6709\u4e00\u4e2a\u914d\u7f6e\uff0c\u5c31\u662f\u5728\u6267\u884c\u67e5\u8be2\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u6307\u5b9a\u626b\u63cf\u90e8\u5206\u5206\u533a\uff0c\u6bd4\u5982\u53ef\u4ee5\u626b\u63cf30%\u7684\u5206\u533a\uff0c\u5728\u4f7f\u7528\u7684\u65f6\u5019\uff0c\u76f8\u5f53\u4e8e\u968f\u673a\u62bd\u6837\uff0c\u52a0\u5feb\u67e5\u8be2\u3002<\/p>\n<h3>Google Dremel\u6d4b\u8bd5\u5b9e\u9a8c<\/h3>\n<p>\u5b9e\u9a8c\u7684\u6570\u636e\u6e90\u5982\u4e0b\u8868\u793a\u3002\u5927\u90e8\u5206\u6570\u636e\u590d\u5236\u4e863\u6b21\uff0c\u4e5f\u6709\u4e00\u4e2a\u4e24\u6b21\u3002\u6bcf\u4e2a\u8868\u4f1a\u6709\u82e5\u5e72\u5206\u533a\uff0c\u6bcf\u4e2a\u5206\u533a\u7684\u5927\u5c0f\u5728100K\u5230800K\u4e4b\u95f4\u3002\u5982\u679c\u538b\u7f29\u7387\u662f25%\uff0c\u5e76\u4e14\u8ba1\u5165\u590d\u52363\u4efd\u7684\u4e8b\u5b9e\u7684\u8bdd\u3002T1\u7684\u5927\u5c0f\u5df2\u7ecf\u8fbe\u5230PB\u7ea7\u522b\u3002\u8fd9\u4e48\u5c0f\u4e14\u5de8\u91cf\u7684\u5206\u533a\uff0c\u5bf9\u4e8eGFS\u7684\u8981\u6c42\u5f88\u9ad8\uff0c\u73b0\u5728\u7684Hdfs\u7a33\u5b9a\u7248\u6050\u6015\u53d7\u4e0d\u4e86\u3002\u63a5\u4e0b\u6765\u7684\u6d4b\u8bd5\u4f1a\u9010\u6b65\u63ed\u793a\u5176\u662f\u5982\u4f55\u8d85\u8fc7MR\uff0c\u5e76\u5bf9\u6027\u80fd\u4f5c\u51fa\u5206\u6790\u3002<\/p>\n<table border=\"1\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td valign=\"top\" width=\"106\"><strong>\u8868\u540d<\/strong><\/td>\n<td valign=\"top\" width=\"106\"><strong>\u8bb0\u5f55\u6570<\/strong><\/td>\n<td valign=\"top\" width=\"106\"><strong>\u5927\u5c0f(<\/strong><strong>\u5df2\u538b\u7f29)<\/strong><\/td>\n<td valign=\"top\" width=\"106\"><strong>\u5217\u6570<\/strong><\/td>\n<td valign=\"top\" width=\"106\"><strong>\u6570\u636e\u4e2d\u5fc3<\/strong><\/td>\n<td valign=\"top\" width=\"106\"><strong>\u590d\u5236\u6570\u91cf<\/strong><\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"106\">T1<\/td>\n<td valign=\"top\" width=\"106\">85 billion<\/td>\n<td valign=\"top\" width=\"106\">87 TB<\/td>\n<td valign=\"top\" width=\"106\">270<\/td>\n<td valign=\"top\" width=\"106\">A<\/td>\n<td valign=\"top\" width=\"106\">3\u00d7<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"106\">T2<\/td>\n<td valign=\"top\" width=\"106\">24 billion<\/td>\n<td valign=\"top\" width=\"106\">13 TB<\/td>\n<td valign=\"top\" width=\"106\">530<\/td>\n<td valign=\"top\" width=\"106\">A<\/td>\n<td valign=\"top\" width=\"106\">3\u00d7<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"106\">T3<\/td>\n<td valign=\"top\" width=\"106\">4 billion<\/td>\n<td valign=\"top\" width=\"106\">70 TB<\/td>\n<td valign=\"top\" width=\"106\">1200<\/td>\n<td valign=\"top\" width=\"106\">A<\/td>\n<td valign=\"top\" width=\"106\">3\u00d7<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"106\">T4<\/td>\n<td valign=\"top\" width=\"106\">1+ trillion<\/td>\n<td valign=\"top\" width=\"106\">105 TB<\/td>\n<td valign=\"top\" width=\"106\">50<\/td>\n<td valign=\"top\" width=\"106\">B<\/td>\n<td valign=\"top\" width=\"106\">2\u00d7<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"106\">T5<\/td>\n<td valign=\"top\" width=\"106\">1+ trillion<\/td>\n<td valign=\"top\" width=\"106\">20 TB<\/td>\n<td valign=\"top\" width=\"106\">30<\/td>\n<td valign=\"top\" width=\"106\">B<\/td>\n<td valign=\"top\" width=\"106\">3\u00d7<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>\u5217\u5b58\u6d4b\u8bd5<\/h4>\n<p>\u9996\u5148\uff0c\u6211\u4eec\u6d4b\u8bd5\u770b\u770b\u5217\u5b58\u7684\u6548\u679c\u3002\u5bf9\u4e8eT1\u8868\uff0c1GB\u7684\u6570\u636e\u5927\u7ea6\u6709300K\u884c\uff0c\u4f7f\u7528\u5217\u5b58\u7684\u8bdd\u538b\u7f29\u540e\u5927\u7ea6\u5728375MB\u3002\u8fd9\u53f0\u673a\u5668\u78c1\u76d8\u7684\u541e\u5410\u572870MB\/s\u5de6\u53f3\u3002\u8fd91GB\u7684\u6570\u636e\uff0c\u5c31\u662f\u6211\u4eec\u7684\u73b0\u5728\u7684\u6d4b\u8bd5\u6570\u636e\u6e90\uff0c\u6d4b\u8bd5\u73af\u5883\u662f\u5355\u673a\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-27253\" src=\"http:\/\/47.100.65.109\/wp-content\/uploads\/2012\/08\/2012111257-300x194.jpeg\" alt=\"\" width=\"300\" height=\"194\" srcset=\"http:\/\/yankay.com\/wp-content\/uploads\/2012\/08\/2012111257-300x194.jpeg 300w, http:\/\/yankay.com\/wp-content\/uploads\/2012\/08\/2012111257.jpeg 500w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>\u89c1\u4e0a\u56fe\u3002<\/p>\n<ul>\n<li>\u66f2\u7ebfA\uff0c\u662f\u7528\u5217\u5b58\u8bfb\u53d6\u6570\u636e\u5e76\u89e3\u538b\u7684\u8017\u65f6\u3002<\/li>\n<li>\u66f2\u7ebfB\u662f\u4e00\u6761\u4e00\u6761\u8bb0\u5f55\u6328\u4e2a\u8bfb\u7684\u65f6\u95f4\u3002<\/li>\n<li>\u66f2\u7ebfC\u662f\u5728B\u7684\u57fa\u7840\u4e0a\uff0c\u52a0\u4e0a\u4e86\u53cd\u5e8f\u5217\u5316\u7684\u65f6\u95f4\u3002<\/li>\n<li>\u66f2\u7ebfd\uff0c\u662f\u6309\u884c\u5b58\u8bfb\u5e76\u89e3\u538b\u7684\u8017\u65f6\u3002<\/li>\n<li>\u66f2\u7ebfe\u52a0\u4e0a\u4e86\u53cd\u5e8f\u5217\u5316\u7684\u65f6\u95f4\u3002\u56e0\u4e3a\u5217\u5f88\u591a\uff0c\u53cd\u5e8f\u5217\u5316\u8017\u65f6\u8d85\u8fc7\u4e86\u8bfb\u5e76\u89e3\u538b\u768450%\u3002<\/li>\n<\/ul>\n<p>\u4ece\u56fe\u4e0a\u53ef\u4ee5\u770b\u51fa\u3002\u5982\u679c\u9700\u8981\u8bfb\u7684\u5217\u5f88\u5c11\u7684\u8bdd\uff0c\u5217\u5b58\u7684\u4f18\u52bf\u5c31\u4f1a\u7279\u522b\u7684\u660e\u663e\u3002\u5bf9\u4e8e\u5217\u7684\u589e\u52a0\uff0c\u4ea7\u751f\u7684\u8017\u65f6\u4e5f\u51e0\u4e4e\u662f\u7ebf\u6027\u7684\u3002\u800c\u4e00\u6761\u4e00\u6761\u8be5\u4e2a\u8bfb\u548c\u53cd\u5e8f\u5217\u5316\u7684\u5f00\u9500\u662f\u5f88\u5927\u7684\uff0c\u51e0\u4e4e\u90fd\u5728\u539f\u6765\u57fa\u7840\u4e0a\u589e\u52a0\u4e86\u4e00\u500d\u3002\u800c\u6309\u884c\u8bfb\uff0c\u5217\u6570\u7684\u589e\u52a0\u6ca1\u6709\u5f71\u54cd\uff0c\u56e0\u4e3a\u4e00\u6b21\u6027\u8bfb\u4e86\u5168\u90e8\u5217\u3002<\/p>\n<h4>Dremel\u548cMapReduce\u7684\u5bf9\u6bd4\u6d4b\u8bd5<\/h4>\n<p>MR\u548cDremel\u6700\u5927\u7684\u533a\u522b\u5728\u4e8e\u884c\u5b58\u548c\u5217\u5b58\u3002\u5982\u679c\u4e0d\u80fd\u51fb\u8d25MapReduce\uff0cRemel\u5c31\u6ca1\u6709\u610f\u4e49\u4e86\u3002\u4f7f\u7528\u6700\u5e38\u89c1\u7684WordCount\u6d4b\u8bd5\uff0c\u8ba1\u7b97\u8fd9\u4e2a\u6570\u636e\u4e2dWord\u7684\u4e2a\u6570\u3002<\/p>\n<pre>Q1: SELECT SUM(CountWords(txtField)) \/ COUNT(*) FROM T1<\/pre>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-27254\" src=\"http:\/\/47.100.65.109\/wp-content\/uploads\/2012\/08\/2012111258-300x136.jpeg\" alt=\"\" width=\"300\" height=\"136\" srcset=\"http:\/\/yankay.com\/wp-content\/uploads\/2012\/08\/2012111258-300x136.jpeg 300w, http:\/\/yankay.com\/wp-content\/uploads\/2012\/08\/2012111258.jpeg 500w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>\u4e0a\u56fe\u662f\u6d4b\u8bd5\u7684\u7ed3\u679c\u3002\u4f7f\u7528\u4e86\u4e24\u4e2aMR\u4efb\u52a1\u3002\u8fd9\u4e24\u4e2a\u4efb\u52a1\u548cDremel\u4e00\u6837\u90fd\u8fd0\u884c\u57283000\u4e2a\u8282\u70b9\u4e0a\u9762\u3002\u5982\u679c\u4f7f\u7528\u5217\u5b58\uff0cDremel\u7684\u6309\u5217\u8bfb\u7684MR\u53ea\u9700\u8981\u8bfb0.5TB\u7684\u6570\u636e\uff0c\u800c\u6309\u884c\u5b58\u9700\u8981\u8bfb87TB\u3002 MR\u63d0\u4f9b\u4e86\u4e00\u4e2a\u65b9\u4fbf\u6709\u6548\u7684\u9014\u7ecf\u6765\u8bb2\u6309\u884c\u6570\u636e\u8f6c\u6362\u6210\u6309\u5217\u7684\u6570\u636e\u3002Dremel\u53ef\u4ee5\u65b9\u4fbf\u7684\u5bfc\u5165MapReduce\u7684\u5904\u7406\u7ed3\u679c\u3002<\/p>\n<h4>\u6811\u72b6\u8ba1\u7b97Server\u6d4b\u8bd5<\/h4>\n<p>\u63a5\u4e0b\u6765\u6211\u4eec\u8981\u5bf9\u6bd4\u5728T2\u8868\u793a\u4f7f\u7528\u4e24\u4e2a\u4e0d\u540c\u7684Group BY\u67e5\u8be2\u3002T2\u8868\u670924 billion \u884c\u7684\u8bb0\u5f55\u3002\u6bcf\u4e2a\u8bb0\u5f55\u6709\u4e00\u4e2a item\u5217\u8868\uff0c\u6bcf\u4e00item\u6709\u4e00\u4e2aamount \u5b57\u6bb5\u3002\u603b\u5171\u670940 billion\u4e2aitem.amount\u3002\u8fd9\u4e24\u4e2aQuery\u5206\u522b\u662f\u3002<\/p>\n<pre>Q2: SELECT country, SUM(item.amount) FROM T2 GROUP BY country\n\nQ3: SELECT domain, SUM(item.amount) FROM T2 WHERE domain CONTAINS \u2019.net\u2019 GROUP BY domain<\/pre>\n<p>Q2\u9700\u8981\u626b\u63cf60GB\u7684\u538b\u7f29\u6570\u636e\uff0cQ3\u9700\u8981\u626b\u63cf180GB\uff0c\u540c\u65f6\u8fd8\u8981\u8fc7\u6ee4\u4e00\u4e2a\u6761\u4ef6\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-27257\" src=\"http:\/\/47.100.65.109\/wp-content\/uploads\/2012\/08\/2012111259-300x131.jpeg\" alt=\"\" width=\"300\" height=\"131\" srcset=\"http:\/\/yankay.com\/wp-content\/uploads\/2012\/08\/2012111259-300x131.jpeg 300w, http:\/\/yankay.com\/wp-content\/uploads\/2012\/08\/2012111259.jpeg 500w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>\u4e0a\u56fe\u662f\u8fd9\u4e24\u4e2aQuery\u5728\u4e0d\u540c\u7684server\u62d3\u6251\u4e0b\u7684\u6027\u80fd\u3002\u6bcf\u4e2a\u6d4b\u8bd5\u90fd\u662f\u67092900\u4e2a\u53f6\u5b50Server\u3002\u57282\u7ea7\u62d3\u6251\u4e2d\uff0c\u6839server\u76f4\u63a5\u548c\u53f6\u5b50Server\u901a\u4fe1\u3002\u57283\u7ea7\u62d3\u6251\u4e2d\uff0c\u5404\u4e2a\u7ea7\u522b\u7684\u6bd4\u4f8b\u662f1:100:2900\uff0c\u589e\u52a0\u4e86100\u4e2a\u4e2d\u95f4Server\u3002\u57284\u7ea7\u62d3\u6251\u4e2d\uff0c\u6bd4\u4f8b\u4e3a1:10:100:2900.<\/p>\n<p>Q2\u53ef\u4ee5\u57283\u7ea7\u62d3\u6251\u4e0b3\u79d2\u5185\u6267\u884c\u5b8c\u6bd5\uff0c\u4f46\u662f\u4e3a\u4ed6\u63d0\u4f9b\u66f4\u9ad8\u7684\u62d3\u6251\u7ea7\u522b\uff0c\u5bf9\u6027\u80fd\u63d0\u5347\u6ca1\u6709\u88e8\u76ca\u3002\u76f8\u6bd4\u4e4b\u4e0b\uff0c\u4e3aQ3\u63d0\u4f9b\u66f4\u9ad8\u7684\u62d3\u6251\u7ea7\u522b\uff0c\u6027\u80fd\u53ef\u4ee5\u6709\u6548\u63d0\u5347\u3002\u8fd9\u4e2a\u6d4b\u8bd5\u4f53\u73b0\u4e86\u6811\u72b6\u62d3\u6251\u5bf9\u6027\u80fd\u63d0\u5347\u7684\u4f5c\u7528\u3002<\/p>\n<h4>\u6bcf\u4e2a\u5206\u533a\u7684\u6267\u884c\u60c5\u51b5<\/h4>\n<p>\u5bf9\u4e8e\u521a\u521a\u7684\u4e24\u4e2a\u67e5\u8be2\uff0c\u5177\u4f53\u7684\u6bcf\u4e2a\u5206\u533a\u7684\u6267\u884c\u60c5\u51b5\u662f\u8fd9\u6837\u7684\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-27258\" src=\"http:\/\/47.100.65.109\/wp-content\/uploads\/2012\/08\/20121112510-300x143.jpeg\" alt=\"\" width=\"300\" height=\"143\" srcset=\"http:\/\/yankay.com\/wp-content\/uploads\/2012\/08\/20121112510-300x143.jpeg 300w, http:\/\/yankay.com\/wp-content\/uploads\/2012\/08\/20121112510.jpeg 500w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>\u53ef\u4ee5\u770b\u523099%\u7684\u5206\u533a\u90fd\u57281s\u5185\u5b8c\u6210\u4e86\u3002Dremel\u4f1a\u81ea\u52a8\u8c03\u5ea6\uff0c\u4f7f\u7528\u65b0\u7684Server\u8ba1\u7b97\u62d6\u540e\u817f\u7684\u4efb\u52a1\u3002<\/p>\n<h4>\u8bb0\u5f55\u5185\u805a\u5408<\/h4>\n<p>\u7531\u4e8eDemel\u652f\u6301List\u7684\u6570\u636e\u7c7b\u578b\uff0c\u6709\u7684\u65f6\u5019\uff0c\u6211\u4eec\u9700\u8981\u8ba1\u7b97\u6bcf\u4e2a\u8bb0\u5f55\u91cc\u9762\u7684\u5404\u4e2aList\u7684\u805a\u5408\u3002\u5982<\/p>\n<pre>Q4 : SELECT COUNT(c1 &gt; c2) FROM\n\n(SELECT SUM(a.b.c.d) WITHIN RECORD AS c1,\n\nSUM(a.b.p.q.r) WITHIN RECORD AS c2\n\nFROM T3)<\/pre>\n<p>\u6211\u4eec\u9700\u8981count\u6240\u6709sum(a.b.c.d)\u6bd4sum(a.b.p.q.r)\uff0c\u6267\u884c\u8fd9\u6761\u8bed\u53e5\u5b9e\u9645\u53ea\u9700\u8981\u626b\u63cf13GB\u7684\u6570\u636e\uff0c\u8017\u65f615s\uff0c\u800c\u6574\u5f20\u8868\u670970TB\u3002\u5982\u679c\u6ca1\u6709\u8fd9\u6837\u7684\u5d4c\u5957\u6570\u636e\u7ed3\u6784\uff0c\u8fd9\u6837\u7684\u67e5\u8be2\u4f1a\u5f88\u590d\u6742\u3002<\/p>\n<h4>\u6269\u5c55\u6027\u6d4b\u8bd5<\/h4>\n<p>Dremel\u6709\u826f\u597d\u7684\u6269\u5c55\u6027\uff0c\u53ef\u4ee5\u901a\u8fc7\u589e\u52a0\u673a\u5668\u6765\u7f29\u77ed\u67e5\u8be2\u7684\u65f6\u95f4\u3002\u5e76\u4e14\u53ef\u4ee5\u5904\u7406\u6570\u4ee5\u4e07\u4ebf\u8ba1\u7684\u8bb0\u5f55\u3002<\/p>\n<p>\u5bf9\u4e8e\u67e5\u8be2\uff1a<\/p>\n<pre>Q5: SELECT TOP(aid, 20), COUNT(*) FROM T4?WHERE bid = fvalue1g AND cid = fvalue2g<\/pre>\n<p>\u4f7f\u7528\u4e0d\u540c\u7684\u53f6\u5b50Server\u6570\u76ee\u6765\u8fdb\u884c\u6d4b\u8bd5\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-27260\" src=\"http:\/\/47.100.65.109\/wp-content\/uploads\/2012\/08\/20121112511-300x124.jpeg\" alt=\"\" width=\"300\" height=\"124\" srcset=\"http:\/\/yankay.com\/wp-content\/uploads\/2012\/08\/20121112511-300x124.jpeg 300w, http:\/\/yankay.com\/wp-content\/uploads\/2012\/08\/20121112511.jpeg 500w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>\u53ef\u4ee5\u53d1\u73b0CPU\u7684\u8017\u65f6\u603b\u6570\u662f\u57fa\u672c\u4e0d\u53d8\u7684\uff0c\u572830\u4e07\u79d2\u5de6\u53f3\u3002\u4f46\u662f\u968f\u7740\u8282\u70b9\u6570\u7684\u589e\u52a0\uff0c\u6267\u884c\u65f6\u95f4\u4e5f\u4f1a\u76f8\u5e94\u7f29\u77ed\u3002\u51e0\u4e4e\u5448\u7ebf\u6027\u9012\u51cf\u3002\u5982\u679c\u6211\u4eec\u4f7f\u7528\u901a\u8fc7CPU\u65f6\u95f4\u8ba1\u8d39\u7684\u201c\u4e91\u8ba1\u7b97\u201d\u673a\u5668\uff0c\u6bcf\u4e2a\u79df\u6237\u7684\u67e5\u8be2\u90fd\u53ef\u4ee5\u5f88\u5feb\uff0c\u6210\u672c\u4e5f\u4f1a\u975e\u5e38\u4f4e\u5ec9\u3002<\/p>\n<h3>\u5bb9\u9519\u6d4b\u8bd5<\/h3>\n<p>\u4e00\u4e2a\u5927\u56e2\u961f\u91cc\u9762\uff0c\u603b\u6709\u51e0\u4e2a\u62d6\u6cb9\u74f6\u3002\u5bf9\u4e8e\u6709\u4e07\u4ebf\u6761\u8bb0\u5f55\u7684T5\uff0c\u6211\u4eec\u6267\u884c\u4e0b\u9762\u7684\u8bed\u53e5\u3002<\/p>\n<pre>Q6: SELECT COUNT(DISTINCT a) FROM T5<\/pre>\n<p>\u503c\u5f97\u6ce8\u610f\u7684\u662fT5\u7684\u6570\u636e\u53ea\u6709\u4e24\u4efd\u62f7\u8d1d\uff0c\u6240\u4ee5\u6709\u66f4\u9ad8\u7684\u6982\u7387\u51fa\u73b0\u574f\u8282\u70b9\u548c\u62d6\u6cb9\u74f6\u3002\u8fd9\u4e2a\u67e5\u8be2\u9700\u8981\u626b\u63cf\u5927\u7ea61TB\u7684\u538b\u7f29\u6570\u636e\uff0c\u4f7f\u75282500\u4e2a\u8282\u70b9\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-27261\" src=\"http:\/\/47.100.65.109\/wp-content\/uploads\/2012\/08\/20121112512-300x155.jpeg\" alt=\"\" width=\"300\" height=\"155\" srcset=\"http:\/\/yankay.com\/wp-content\/uploads\/2012\/08\/20121112512-300x155.jpeg 300w, http:\/\/yankay.com\/wp-content\/uploads\/2012\/08\/20121112512.jpeg 500w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>\u53ef\u4ee5\u770b\u523099%\u7684\u5206\u533a\u90fd\u57285S\u5185\u5b8c\u6210\u7684\u3002\u4e0d\u5e78\u7684\u662f\uff0c\u6709\u4e00\u4e9b\u5206\u533a\u9700\u8981\u8f83\u957f\u7684\u65f6\u95f4\u6765\u5904\u7406\u3002\u5c3d\u7ba1\u901a\u8fc7\u52a8\u6001\u8c03\u5ea6\u53ef\u4ee5\u52a0\u5feb\u4e00\u4e9b\uff0c\u4f46\u5728\u5982\u6b64\u5927\u89c4\u6a21\u7684\u8ba1\u7b97\u4e0a\u9762\uff0c\u5f88\u96be\u5b8c\u5168\u4e0d\u51fa\u95ee\u9898\u3002\u5982\u679c\u4e0d\u5728\u610f\u592a\u7cbe\u786e\u7684\u7ed3\u679c\uff0c\u5b8c\u5168\u53ef\u4ee5\u5c0f\u5c0f\u51cf\u5c11\u8986\u76d6\u7684\u6bd4\u4f8b\uff0c\u5927\u5927\u63d0\u5347\u76f8\u5e94\u901f\u5ea6\u3002<\/p>\n<h3>Google Dremel \u7684\u5f71\u54cd<\/h3>\n<p>Google Dremel\u7684\u80fd\u5728\u5982\u6b64\u77ed\u7684\u65f6\u95f4\u5185\u5904\u7406\u8fd9\u4e48\u5927\u7684\u6570\u636e\uff0c\u7684\u786e\u662f\u5341\u5206\u60ca\u8273\u7684\u3002\u6709\u4e2a\u4f2f\u514b\u5229\u5206\u6821\u7684\u6559\u6388Armando Fox\u8bf4\u8fc7\u4e00\u53e5\u8bdd\u201c\u5982\u679c\u4f60\u66fe\u4e8b\u5148\u544a\u8bc9\u6211Dremel\u58f0\u79f0\u5176\u5c06\u53ef\u505a\u4e9b\u4ec0\u4e48\uff0c\u90a3\u4e48\u6211\u4e0d\u4f1a\u76f8\u4fe1\u4f60\u80fd\u5f00\u53d1\u51fa\u8fd9\u79cd\u5de5\u5177\u201d\u3002\u8fd9\u4e48\u7ed9\u529b\u7684\u6280\u672f\uff0c\u5fc5\u7136\u5bf9\u4e1a\u754c\u9020\u6210\u5de8\u5927\u7684\u5f71\u54cd\u3002\u7b2c\u4e00\u4e2a\u88ab\u6ce2\u53ca\u5230\u7684\u5fc5\u7136\u662fHadoop\u3002<\/p>\n<h4>Dremel\u4e0eHadoop<\/h4>\n<p>Dremel\u7684\u516c\u5f00\u8bba\u6587\u91cc\u9762\u5df2\u7ecf\u8bf4\u7684\u5f88\u660e\u767d\uff0cDremel\u4e0d\u662f\u7528\u6765\u66ff\u4ee3MapReduce\uff0c\u800c\u662f\u548c\u5176\u66f4\u597d\u7684\u7ed3\u5408\u3002Hadoop\u7684Hive\uff0cPig\u65e0\u6cd5\u63d0\u4f9b\u53ca\u65f6\u7684\u67e5\u8be2\uff0c\u800cDremel\u7684\u5feb\u901f\u67e5\u8be2\u6280\u672f\u53ef\u4ee5\u7ed9Hadoop\u63d0\u4f9b\u6709\u529b\u7684\u8865\u5145\u3002\u540c\u65f6Dremel\u53ef\u4ee5\u7528\u6765\u5206\u6790MapReduce\u7684\u7ed3\u679c\u96c6\uff0c\u53ea\u9700\u8981\u5c06MapReduce\u7684OutputFormat\u4fee\u6539\u4e3aDremel\u7684\u683c\u5f0f\uff0c\u5c31\u53ef\u4ee5\u51e0\u4e4e\u4e0d\u5f15\u5165\u989d\u5916\u5f00\u9500\uff0c\u5c06\u6570\u636e\u5bfc\u5165Dremel\u3002\u4f7f\u7528Dremel\u6765\u5f00\u53d1\u6570\u636e\u5206\u6790\u6a21\u578b\uff0cMapReduce\u6765\u6267\u884c\u6570\u636e\u5206\u6790\u6a21\u578b\u3002<\/p>\n<p>Hadoop\u7684Hive,Pig\u73b0\u5728\u4e5f\u6709\u4e86\u5217\u5b58\u7684\u6a21\u5f0f\uff0c\u67b6\u6784\u4e0a\u548cDremel\u4e5f\u63a5\u8fd1\u3002\u4f46\u662f\u65e0\u8bba\u5b58\u50a8\u7ed3\u6784\u8fd8\u662f\u8ba1\u7b97\u65b9\u5f0f\u90fd\u6ca1\u6709Dremel\u7cbe\u81f4\u3002\u5bf9Hadoop\u5b9e\u65f6\u6027\u7684\u6539\u8fdb\u4e5f\u4e00\u76f4\u662f\u4e2a\u70ed\u70b9\u8bdd\u9898\u3002\u8981\u60f3\u5728Hadoop\u4e2d\u5c71\u5be8\u4e00\u4e2aDremel\uff0c\u5e76\u4e14\u76f8\u5bf9\u73b0\u6709\u89e3\u51b3\u65b9\u6848\u6709\u7a81\u7834\uff0c\u7b14\u8005\u89c9\u5f97Hadoop\u81ea\u8eab\u9700\u8981\u4e00\u4e9b\u6539\u8fdb\u3002\u4e00\u4e2a\u662fHDFS\u9700\u8981\u5bf9\u5e76\u53d1\u7ec6\u788e\u7684\u6570\u636e\u8bfb\u6027\u80fd\u6709\u5927\u7684\u6539\u8fdb\uff0cHDFS\u9700\u8981\u66f4\u52a0\u7684\u4f4e\u5ef6\u8fdf\u3002\u518d\u8005\u662fHadoop\u9700\u8981\u4e0d\u4ec5\u4ec5\u652f\u6301MapReduce\u8fd9\u4e00\u79cd\u8ba1\u7b97\u6846\u67b6\u3002\u5176\u4ed6\u90e8\u5206,Hadoop\u90fd\u6709\u5bf9\u5e94\u7684\u5f00\u6e90\u7ec4\u4ef6\uff0c\u4e07\u4e8b\u4ff1\u5907\u53ea\u6b20\u4e1c\u98ce\u3002<\/p>\n<h4>Dremel\u7684\u5f00\u6e90\u5b9e\u73b0<\/h4>\n<p>Dremel\u73b0\u5728\u8fd8\u6ca1\u6709\u4e00\u4e2a\u53ef\u4ee5\u8fd0\u884c\u7684\u5f00\u6e90\u5b9e\u73b0\uff0c\u4e0d\u8fc7\u6211\u4eec\u770b\u5230\u5f88\u591a\u52aa\u529b\u3002\u4e00\u4e2a\u662fApache\u7684Drill\uff0c\u4e00\u4e2a\u662fOpenDremel\/Dazo\u3002<\/p>\n<p><strong>OpenDremel\/Dazo<\/strong><\/p>\n<p>OpenDremel\u662f\u4e00\u4e2a\u5f00\u6e90\u9879\u76ee\uff0c\u6700\u8fd1\u6539\u540d\u4e3aDazo\u3002\u53ef\u4ee5\u5728GoogleCode\u4e0a\u627e\u5230<a href=\"http:\/\/code.google.com\/p\/dremel\/\">http:\/\/code.google.com\/p\/dremel\/<\/a>\u3002\u76ee\u524d\u8fd8\u6ca1\u6709\u53d1\u5e03\u3002\u4f5c\u8005\u58f0\u79f0\u4ed6\u5df2\u7ecf\u5b8c\u6210\u4e86\u4e00\u4e2a\u901a\u7528\u6267\u884c\u5f15\u64ce\u548cOpenStack Swift\u7684\u96c6\u6210\u3002\u7b14\u8005\u611f\u89c9\u5176\u8d8a\u8d70\u8d8a\u6b6a\uff0c\u79bbDremel\u8d8a\u6765\u8d8a\u8fdc\u4e86\u3002<\/p>\n<p><strong>Apache Drill<\/strong><\/p>\n<p><a href=\"http:\/\/wiki.apache.org\/incubator\/DrillProposal\">Drill <\/a>\u662fHadoop\u7684\u8d5e\u52a9\u5546\u4e4b\u4e00MapR\u53d1\u8d77\u7684\u3002Drill\u4f5c\u4e3a\u4e00\u4e2aDremel\u7684\u5c71\u5be8\u9879\u76ee\uff0c\u6709\u548cDremel\u76f8\u4f3c\u7684\u67b6\u6784\u548c\u80fd\u529b\u3002\u4ed6\u4eec\u5e0c\u671bDrill\u6700\u7ec8\u4f1a\u60f3Hive,Pig\u4e00\u6837\u6210\u4e3aHadoop\u4e0a\u7684\u91cd\u8981\u7ec4\u6210\u90e8\u5206\u3002\u4e3aHadoop\u63d0\u4f9b\u5feb\u901f\u67e5\u8be2\u7684\u80fd\u529b\u3002\u548cDremel\u6709\u4e00\u70b9\u4e0d\u540c\uff0c\u5728\u6570\u636e\u6a21\u578b\u4e0a\uff0c\u5f00\u6e90\u7684\u9879\u76ee\u9700\u8981\u652f\u6301\u66f4\u6807\u51c6\u7684\u6570\u636e\u7ed3\u6784\u3002\u6bd4\u5982CSV\u548cJSON\u3002\u540c\u65f6Drill\u8fd8\u6709\u66f4\u5927\u7684\u7075\u6d3b\u6027\uff0c\u652f\u6301\u591a\u91cd\u67e5\u8be2\u8bed\u8a00\uff0c\u591a\u79cd\u63a5\u53e3\u3002<\/p>\n<p>\u73b0\u5728Drill\u7684\u76ee\u6807\u662f\u5b8c\u6210\u521d\u59cb\u7684\u9700\u6c42\uff0c\u67b6\u6784\u3002\u5b8c\u6210\u4e00\u4e2a\u521d\u59cb\u7684\u5b9e\u73b0\u3002\u8fd9\u4e2a\u5b9e\u73b0\u5305\u62ec\u4e00\u4e2a\u6267\u884c\u5f15\u64ce\u548cDrQL\u3002DrQL\u662f\u4e00\u4e2a\u57fa\u4e8e\u5217\u7684\u683c\u5f0f\uff0c\u7c7b\u4f3c\u4e8eDremel\u3002\u76ee\u524d\uff0cDrill\u5df2\u7ecf\u5b8c\u6210\u7684\u9700\u6c42\u548c\u67b6\u6784\u8bbe\u8ba1\u3002\u603b\u5171\u5206\u4e3a\u4e86\u56db\u4e2a\u7ec4\u4ef6<\/p>\n<ul>\n<li>Query language:\u7c7b\u4f3cGoogle BigQuery\u7684\u67e5\u8be2\u8bed\u8a00\uff0c\u652f\u6301\u5d4c\u5957\u6a21\u578b\uff0c\u540d\u4e3aDrQL.<\/li>\n<li>Low-lantency distribute execution engine:\u6267\u884c\u5f15\u64ce\uff0c\u53ef\u4ee5\u652f\u6301\u5927\u89c4\u6a21\u6269\u5c55\u548c\u5bb9\u9519\u3002\u53ef\u4ee5\u8fd0\u884c\u5728\u4e0a\u4e07\u53f0\u673a\u5668\u4e0a\u8ba1\u7b97\u6570\u4ee5PB\u7684\u6570\u636e\u3002<\/li>\n<li>Nested data format:\u5d4c\u5957\u6570\u636e\u6a21\u578b\uff0c\u548cDremel\u7c7b\u4f3c\u3002\u4e5f\u652f\u6301CSV,JSON,YAML\u7c7b\u4f3c\u7684\u6a21\u578b\u3002\u8fd9\u6837\u6267\u884c\u5f15\u64ce\u5c31\u53ef\u4ee5\u652f\u6301\u66f4\u591a\u7684\u6570\u636e\u7c7b\u578b\u3002<\/li>\n<li>Scalable data source: \u652f\u6301\u591a\u79cd\u6570\u636e\u6e90\uff0c\u73b0\u9636\u6bb5\u4ee5Hadoop\u4e3a\u6570\u636e\u6e90\u3002<\/li>\n<\/ul>\n<p>\u76ee\u524d\u8fd9\u56db\u4e2a\u7ec4\u4ef6\u5728\u5206\u522b\u79ef\u6781\u7684\u63a8\u8fdb\uff0cDrill\u4e5f\u975e\u5e38\u5e0c\u671b\u6709\u793e\u533a\u5176\u4ed6\u516c\u53f8\u6765\u52a0\u5165\u3002Drill\u5e0c\u671b\u52a0\u5165\u5230Hadoop\u751f\u6001\u7cfb\u7edf\u4e2d\u53bb\u3002<\/p>\n<h3>\u6700\u540e\u7684\u8bdd<\/h3>\n<p>\u672c\u6587\u4ecb\u7ecd\u4e86Google Dremel\u7684\u4f7f\u7528\u573a\u666f\uff0c\u8bbe\u8ba1\u5b9e\u73b0\uff0c\u6d4b\u8bd5\u5b9e\u9a8c\uff0c\u548c\u5bf9\u5f00\u6e90\u4e16\u754c\u7684\u5f71\u54cd\u3002\u76f8\u4fe1\u4e0d\u4e45\u7684\u5c06\u6765\uff0cDremel\u7684\u6280\u672f\u4f1a\u5f97\u5230\u5e7f\u6cdb\u7684\u5e94\u7528\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dremel \u662fGoogle \u7684\u201c\u4ea4\u4e92\u5f0f\u201d\u6570\u636e\u5206\u6790\u7cfb\u7edf\u3002\u53ef\u4ee5\u7ec4\u5efa\u6210\u89c4\u6a21\u4e0a\u5343\u7684\u96c6\u7fa4\uff0c\u5904\u7406PB\u7ea7\u522b\u7684\u6570\u636e\u3002MapReduce\u5904\u7406\u4e00\u4e2a\u6570\u636e\uff0c\u9700\u8981\u5206\u949f\u7ea7\u7684\u65f6\u95f4\u3002\u4f5c\u4e3aMapReduce\u7684\u53d1\u8d77\u4eba\uff0cGoogle\u5f00\u53d1\u4e86Dremel\u5c06\u5904\u7406\u65f6\u95f4\u7f29\u77ed\u5230\u79d2\u7ea7\uff0c\u4f5c\u4e3aMapReduce\u7684\u6709\u529b\u8865\u5145\u3002Dremel\u4f5c\u4e3aGoogle BigQuery\u7684report\u5f15\u64ce\uff0c\u83b7\u5f97\u4e86\u5f88\u5927\u7684\u6210\u529f\u3002\u6700\u8fd1Apache\u8ba1\u5212\u63a8\u51faDremel\u7684\u5f00\u6e90\u5b9e\u73b0Drill\uff0c\u5c06Dremel\u7684\u6280\u672f\u53c8\u63a8\u5230\u4e86\u6d6a\u5c16\u4e0a\u3002<\/p>\n<p><a class=\"excerpt-more\" href=\"http:\/\/yankay.com\/google-dremel-rationale\/\">\u9605\u8bfb\u66f4\u591a......<\/a><\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[23,24,42,47],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v16.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Google Dremel \u539f\u7406 - \u5982\u4f55\u80fd3\u79d2\u5206\u67901PB - \u6211\u81ea\u7136<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/yankay.com\/google-dremel-rationale\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Google Dremel \u539f\u7406 - \u5982\u4f55\u80fd3\u79d2\u5206\u67901PB - \u6211\u81ea\u7136\" \/>\n<meta property=\"og:description\" content=\"Dremel \u662fGoogle \u7684\u201c\u4ea4\u4e92\u5f0f\u201d\u6570\u636e\u5206\u6790\u7cfb\u7edf\u3002\u53ef\u4ee5\u7ec4\u5efa\u6210\u89c4\u6a21\u4e0a\u5343\u7684\u96c6\u7fa4\uff0c\u5904\u7406PB\u7ea7\u522b\u7684\u6570\u636e\u3002MapReduce\u5904\u7406\u4e00\u4e2a\u6570\u636e\uff0c\u9700\u8981\u5206\u949f\u7ea7\u7684\u65f6\u95f4\u3002\u4f5c\u4e3aMapReduce\u7684\u53d1\u8d77\u4eba\uff0cGoogle\u5f00\u53d1\u4e86Dremel\u5c06\u5904\u7406\u65f6\u95f4\u7f29\u77ed\u5230\u79d2\u7ea7\uff0c\u4f5c\u4e3aMapReduce\u7684\u6709\u529b\u8865\u5145\u3002Dremel\u4f5c\u4e3aGoogle BigQuery\u7684report\u5f15\u64ce\uff0c\u83b7\u5f97\u4e86\u5f88\u5927\u7684\u6210\u529f\u3002\u6700\u8fd1Apache\u8ba1\u5212\u63a8\u51faDremel\u7684\u5f00\u6e90\u5b9e\u73b0Drill\uff0c\u5c06Dremel\u7684\u6280\u672f\u53c8\u63a8\u5230\u4e86\u6d6a\u5c16\u4e0a\u3002\" \/>\n<meta property=\"og:url\" content=\"http:\/\/yankay.com\/google-dremel-rationale\/\" \/>\n<meta property=\"og:site_name\" content=\"\u6211\u81ea\u7136\" \/>\n<meta property=\"article:published_time\" content=\"2012-08-23T13:46:45+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-03-28T12:36:16+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/47.100.65.109\/wp-content\/uploads\/2012\/08\/2012111251-300x148.jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data1\" content=\"3\u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebSite\",\"@id\":\"http:\/\/yankay.com\/#website\",\"url\":\"http:\/\/yankay.com\/\",\"name\":\"\\u6211\\u81ea\\u7136\",\"description\":\"\\u989c\\u5f00\\u7684\\u535a\\u5ba2\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":\"http:\/\/yankay.com\/?s={search_term_string}\",\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"zh-CN\"},{\"@type\":\"ImageObject\",\"@id\":\"http:\/\/yankay.com\/google-dremel-rationale\/#primaryimage\",\"inLanguage\":\"zh-CN\",\"url\":\"http:\/\/47.100.65.109\/wp-content\/uploads\/2012\/08\/2012111251-300x148.jpeg\",\"contentUrl\":\"http:\/\/47.100.65.109\/wp-content\/uploads\/2012\/08\/2012111251-300x148.jpeg\"},{\"@type\":\"WebPage\",\"@id\":\"http:\/\/yankay.com\/google-dremel-rationale\/#webpage\",\"url\":\"http:\/\/yankay.com\/google-dremel-rationale\/\",\"name\":\"Google Dremel \\u539f\\u7406 - \\u5982\\u4f55\\u80fd3\\u79d2\\u5206\\u67901PB - 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\/ Yoast SEO plugin. 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