{"id":1079,"date":"2010-03-12T09:24:00","date_gmt":"2010-03-12T01:24:00","guid":{"rendered":"\/?p=1079"},"modified":"2010-03-12T09:24:00","modified_gmt":"2010-03-12T09:24:00","slug":"1079","status":"publish","type":"post","link":"https:\/\/blog.vimge.com\/archives\/nosql\/1079.html","title":{"rendered":"\u5206\u5e03\u5f0fkey-value\u6570\u636e\u5e93LightCloud\u7684\u8bbe\u8ba1\u539f\u7406"},"content":{"rendered":"<p>LightCloud\u662f\u6700\u8fd1\u770b\u5230\u7684\u4e00\u4e2a\u6bd4\u8f83\u8f7b\u5de7\u7684\u5206\u5e03\u5f0fkey-value\u6570\u636e\u5e93\uff0c\u5c3d\u7ba1\u8fd9\u7c7b\u8f6f\u4ef6\u5df2\u7ecf\u8ba9\u4eba\u89c9\u5f97\u5ba1\u7f8e\u75b2\u52b3\uff0c\u4f46\u6211\u4ecd\u7136\u89c9\u5f97\u5b83\u7684\u8bbe\u8ba1\u601d\u8def\u503c \u5f97\u4e00\u63d0\u3002<\/p>\n<h2>\u7279\u8272<\/h2>\n<p>\u9664\u5f00\u5176\u9879\u76ee\u4e3b\u9875\u4e0a\u5217\u51fa\u6765\u7684\u7279\u70b9\u4e0d\u63d0\uff0c\u6211\u89c9\u5f97\u8fd8\u80fd\u6570\u5f97\u4e0a\u7684\u7279\u8272\u6709\uff1a<\/p>\n<ul>\n<ol>\n<li><span style=\"color: #cc0000;\"><strong>\u7406\u8bba\u4e0a\u53ef\u4ee5\u7528\u4efb\u610fkey-value\u6570\u636e\u5e93\u505a\u4e3a\u5e95\u5c42\u5b58\u50a8\uff0c\u73b0\u5728\u652f\u6301\u4ee5<a href=\"http:\/\/1978th.net\/tokyotyrant\/\">tokyo tyrant<\/a>\u6216\u8005<a href=\"http:\/\/code.google.com\/p\/redis\/\">redis<\/a>\u4f5c\u4e3a\u5e95\u5c42\u7684\u5b58\u50a8\uff0c\u5982\u679c\u4f7f\u7528redis\u53ef\u4ee5\u83b7\u5f97\u66f4\u597d\u7684 \u6027\u80fd\uff08\u5927\u6982\u63d0\u534730%~50%\uff09<\/strong><\/span><\/li>\n<li><span style=\"color: #cc0000;\"><strong>\u6ca1\u6709\u5b9a\u5236\u670d\u52a1\u5668\u7aef\uff0c\u57fa\u672c\u4e0a\u9760\u5ba2\u6237\u7aef\u8bed\u8a00\u6765\u5b9e\u73b0\u952e\u503c\u67e5\u627e\u3002\u4f18\u70b9\u662f\u90e8\u7f72\u8d77\u6765\u6bd4\u8f83\u7b80\u5355\uff0c\u7f3a\u70b9\u4e5f\u662f\u663e\u800c\u6613\u89c1\u7684\uff0c\u6548\u7387\u4f1a\u6709\u635f\u5931\u3002<\/strong><\/span><\/li>\n<li><span style=\"color: #cc0000;\"><strong>\u53ef\u4ee5\u5f88\u65b9\u4fbf\u7684\u79fb\u690d\u5230\u5176\u5b83\u8bed\u8a00\u4e0a\uff0c\u6211\u5df2\u7ecf\u5728github\u4e0a\u627e\u5230\u4e00\u4e2aruby\u7248\u672c\uff0c\u751a\u81f3\u8fd8\u6709\u4e2aphp\u7248\u672c\u7684\u5b9e\u73b0\u3002<\/strong><\/span><\/li>\n<li><span style=\"color: #cc0000;\"><strong>\u53ef\u4ee5\u65b9\u4fbf\u7684\u589e\u52a0\u8282\u70b9\u3002<\/strong><\/span><\/li>\n<li><span style=\"color: #cc0000;\"><strong>\u7ed3\u6784\u7b80\u5355\uff0c\u65b9\u4fbfhack<\/strong><\/span><\/li>\n<\/ol>\n<\/ul>\n<h2>LightCloud\u7684\u8bbe\u8ba1\u539f\u7406<\/h2>\n<h3>Hash ring<\/h3>\n<p>LightCloud\u4e0d\u80fd\u514d\u4fd7\u7684\u4f7f\u7528\u4e86\u4e00\u81f4\u6027hash\u7b97\u6cd5\uff08ConsistentHashing\uff09\uff0c\u8fd9\u662f\u4e3a\u4e86\u907f\u514d\u65b0\u589e\u6570\u636e\u8282\u70b9\u65f6\u53d1\u751f\u96c6\u4f53\u62c6\u8fc1\u4e8b\u4ef6\u3002Consistent Hashing\u7b97\u6cd5\u7684\u539f\u7406\u8bf7\u53c2\u8003<a href=\"http:\/\/www.yeeach.com\/2009\/10\/02\/consistent-hashing%E7%AE%97%E6\">\u8fd9\u91cc<\/a>\u3002<\/p>\n<p>last.fm\u7684\u5de5\u4f5c\u4eba\u5458\u5199\u7684ketama\u7b97\u6cd5\u7b97\u662f\u6bd4\u8f83\u5e38\u89c1\u7684\u4e00\u81f4\u6027\u7b97\u6cd5\uff0c\u5728libmemcached\u91cc\u5927\u91cf\u4f7f\u7528\u3002\u800cLightCloud\u7684\u4f5c\u8005\u5f53 \u65f6\u8fd8\u6ca1\u53d1\u73b0\u5408\u9002\u7684ketamapython\u7248\uff0c\u6240\u4ee5\u5e72\u8106\u81ea\u5df1\u634b\u8d77\u8896\u5b50\u5199\u4e86\u4e2apython\u7248\u672c\u7684hash_ring\uff0c\u4e0d\u523050\u884c\u3002\u8fd9\u4e2a\u662f\u91cf\u8eab\u5b9a\u5236\u7684\uff0c\u6240\u4ee5\u6548\u7387\u4e5f\u8fd8\u8fc7\u5f97\u53bb\uff0c\u4f46\u662f\u517c\u5bb9 ketama\u5c31\u522b\u60f3\u4e86\u3002<\/p>\n<p>\u732e\u4e0ahash\u5708\u5708\u4e00\u4e2a\u4ee5\u660e\u5fd7\uff1a<br \/><img loading=\"lazy\" width=\"600\" height=\"472\" src=\"http:\/\/doophp-wordpress.stor.sinaapp.com\/uploads\/old\/20111227104029_37615.jpg\" \/><\/p>\n<h3>LightCloud\u7684hash\u73af\u6709\u4ec0\u4e48\u4e0e\u4f17\u4e0d\u540c\uff1f<\/h3>\n<p>\u5176\u5b83\u5206\u5e03\u5f0fkey-value\u6570\u636e\u5e93\u91c7\u7528\u7684\u529e\u6cd5\u662f\u590d\u5236\u6570\u636e\u5230\u591a\u4e2a\u8282\u70b9\u4e0a\uff0c\u4f8b\u5982<a href=\"http:\/\/s3.amazonaws.com\/AllThingsDistributed\/sosp\/amazon-dynamo-sosp2007.pdf\">AmazonDynamo<\/a>\u7684\u590d\u5236\u7b56\u7565\u56fe\uff1a<br \/><a href=\"http:\/\/www.ooso.net\/wp-content\/uploads\/2010\/03\/dynamo_replication.png\"><img src=\"http:\/\/doophp-wordpress.stor.sinaapp.com\/uploads\/old\/20111227104031_66890.jpg\" \/><\/a><\/p>\n<p>Dynamo\u7528\u4e86\u8bb8\u591a\u529e\u6cd5\u89e3\u51b3consistent\u95ee\u9898\uff0c\u7cfb\u7edf\u76f8\u5f53\u590d\u6742\u3002\u800cLightCloud\u76f4\u63a5\u4f7f\u7528tokyotyrant\u7684master-master\u590d\u5236\u529f\u80fd\uff0c\u5927\u5e45\u7b80\u5316\u4e86\u8fd9\u90e8\u5206\u7684\u903b\u8f91\u3002\u6240\u4ee5\u5728\u5b83\u7684hash\u73af\u4e0a\uff0c\u5355\u4e2a\u8282\u70b9\u5176\u5b9e\u662f\u4e00\u5bf9master-master\u7684 tokyo tyrant\uff0c\u7126\u4e0d\u79bb\u5b5f\u4e0d\u79bb\u7126\u3002<\/p>\n<p><a href=\"http:\/\/www.ooso.net\/wp-content\/uploads\/2010\/03\/lc_replc.png\"><img src=\"http:\/\/doophp-wordpress.stor.sinaapp.com\/uploads\/old\/20111227104032_47272.jpg\" \/><\/a><\/p>\n<p>\u5728\u65b0\u589e\u6570\u636e\u8282\u70b9\u65f6\uff0c\u5982\u679c\u6ca1\u6709\u8def\u7531\u670d\u52a1\u627e\u5230\u6b63\u786e\u7684\u670d\u52a1\u5668\uff0c\u53ef\u80fd\u4f1a\u635f\u5931\u6570\u636e\u3002\u90a3\u4e48LightCloud\u7ee7\u7eed\u91c7\u7528\u6d41\u6c13\u624b\u6bb5\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u4ed6\u53c8\u7ed9\u4e0a\u4e86\u4e2a\u73af\uff0c \u4fdd\u8bc1\u4e0d\u4f1a\u53d1\u751f\u610f\u5916\u3002\u8fd9\u4e24\u4e2ahash\u73af\u91cc\u7684\u8282\u70b9\u4ecd\u7136\u662f\u4e4b\u524d\u63d0\u5230\u7684tokyo tyrant\u53cc\u4eba\u7ec4\uff0c\u4e00\u4e2a\u73af\u53eb<strong>lookup<\/strong>\uff0c \u8bb0\u5f55\u4e86\u6bcf\u4e00\u4e2akey\u4fdd\u5b58\u5728\u54ea\u4e2astorage\u8282\u70b9\u4e0a\uff1b\u53e6\u5916\u4e00\u4e2a\u73af\u53eb<strong>storage<\/strong>\uff0c\u8fd9\u662f\u771f\u6b63\u5b58\u653e\u6570\u636e\u7684\u5730\u65b9\u3002\u4e8e\u662f\u5b83\u7684 \u7ed3\u6784\u56fe\u53d8\u6210\u4e86\u4e0b\u9762\u8fd9\u4e2a\u6837\u5b50\uff1a<\/p>\n<p><a href=\"http:\/\/www.ooso.net\/wp-content\/uploads\/2010\/03\/storage_lookup.png\"><img src=\"http:\/\/doophp-wordpress.stor.sinaapp.com\/uploads\/old\/20111227104034_88453.jpg\" \/><\/a><\/p>\n<p>\u8fd9\u90e8\u5206\u6bd4\u8f83\u96be\u4ee5\u7406\u89e3\uff0c\u8bd5\u7740\u5c31\u4e0a\u56fe\u9610\u8ff0\u4e00\u4e0b\uff1a<\/p>\n<ul>\n<ol>\n<li>\u4e00\u4e2a\u540d\u53ebA\u7684\u5bb6\u4f19\uff0c\u4f4f\u5728storage_SB\u5730\u533a(storage ring)\u3002\u540c\u65f6\uff0c\u6211\u4eec\u8fd8\u544a\u8bc9\u8bb0\u6027\u597d\u7684lookup_B(lookupring)\uff0cA\u541b\u7684\u5730\u5740\u4e3astorage_SB\u3002<\/li>\n<li>\u5f88\u4e0d\u5e78\u6216\u5f88\u5e78\u8fd0\uff0c\u54b1\u4eec\u7684\u6570\u636e\u81a8\u80c0\u5230\u9700\u8981\u6269\u5bb9\u4e86\uff0c\u4e8e\u662f\u65b0\u589e\u4e86\u4e00\u4e2a\u8fdd\u7ae0\u5efa\u7b51storge_X\uff0c\u8fd9\u4e2a\u8be5\u6b7b\u7684\u5efa\u7b51\u6b63\u597d\u5f71\u54cd\u4e86\u6211\u4eec\u627e\u5230A\u541b\u3002\u8fd9\u65f6\u5019\uff0c\u6211\u4eec\u8fd8 \u53ef\u4ee5\u95ee\u8d77\u8bb0\u6027\u597d\u7684lookup_B\uff0cA\u541b\u4f4f\u5728\u54ea\u4e2a\u89d2\u843d\u91cc\u554a\uff1f \u2015\u2015 lookup_B\u65e5\u9053\uff1a\u4ed6\u5c31\u4f4f\u5728sotrage_SB\u4e00\u5e26~<\/li>\n<li>lookup\u8fd9\u7fa4\u5bb6\u4f19\u8bb0\u6027\u867d\u7136\u597d\uff0c\u4f46\u662f\u4e5f\u67b6\u4e0d\u4f4f\u4eba\u591a\uff0c\u518d\u4e5f\u8bb0\u4e0d\u4f4f\u8fd9\u4e48\u591a\u4eba\u7684\u4f4f\u5740\uff0c\u6240\u4ee5\u53c8\u65b0\u6765\u4e86\u51e0\u4e2a\u8bb0\u6027\u597d\u7684lookup\u3002\u8fd9\u4e2a\u4f1a\u5f71\u54cd\u54b1\u4eec\u627e\u5230 storage\u4f4f\u54ea\u5417\uff1f\u7b54\u6848\u662f\u4e0d\u4f1a\uff0c\u56e0\u4e3a\u6ca1\u6709\u65b0\u589e\u522b\u7684\u8fdd\u7ae0storage\u5efa\u7b51\uff0c\u54b1\u4eec\u4e0d\u9700\u8981\u95ee\u8def\u4e5f\u80fd\u627e\u7740\u4eba\u3002<\/li>\n<\/ol>\n<\/ul>\n<p>\u6309\u7167\u4ee5\u4e0a\u63a8\u8bba\uff0c\u4e00\u5b9a\u8981\u907f\u514d\u51fa\u73b0\u540c\u65f6\u589e\u52a0lookup\u548cstorage\u8282\u70b9\uff0c\u8fd9\u5f88\u53ef\u80fd\u4f1a\u635f\u5931\u6570\u636e\u3002<\/p>\n<h2>\u53c2\u8003\u7f51\u9875<\/h2>\n<ul>\n<li><a href=\"http:\/\/opensource.plurk.com\/LightCloud\/\">http:\/\/opensource.plurk.com\/LightCloud\/<\/a><\/li>\n<li>http:\/\/www.ooso.net\/archives\/549<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>LightCloud\u662f\u6700\u8fd1\u770b\u5230\u7684\u4e00\u4e2a\u6bd4\u8f83\u8f7b\u5de7\u7684\u5206\u5e03\u5f0fkey-value\u6570\u636e\u5e93\uff0c\u5c3d\u7ba1\u8fd9\u7c7b\u8f6f\u4ef6\u5df2\u7ecf\u8ba9\u4eba\u89c9\u5f97\u5ba1\u7f8e\u75b2\u52b3\uff0c\u4f46\u6211\u4ecd\u7136\u89c9\u5f97\u5b83\u7684\u8bbe\u8ba1\u601d\u8def\u503c \u5f97\u4e00\u63d0\u3002<\/p>\n<h2>\u7279\u8272<\/h2>\n<p>\u9664\u5f00\u5176\u9879\u76ee\u4e3b\u9875\u4e0a\u5217\u51fa\u6765\u7684\u7279\u70b9\u4e0d\u63d0\uff0c\u6211\u89c9\u5f97\u8fd8\u80fd\u6570\u5f97\u4e0a\u7684\u7279\u8272\u6709\uff1a<\/p>\n<ul>\n<ol>\n<li><span style=\"color: #cc0000;\"><strong>\u7406\u8bba\u4e0a\u53ef\u4ee5\u7528\u4efb\u610fkey-value\u6570\u636e\u5e93\u505a\u4e3a\u5e95\u5c42\u5b58\u50a8\uff0c\u73b0\u5728\u652f\u6301\u4ee5<a href=\"http:\/\/1978th.net\/tokyotyrant\/\">tokyo tyrant<\/a>\u6216\u8005<a href=\"http:\/\/code.google.com\/p\/redis\/\">redis<\/a>\u4f5c\u4e3a\u5e95\u5c42\u7684\u5b58\u50a8\uff0c\u5982<\/strong><\/span><\/li>\n<\/ol>\n<\/ul>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[4],"tags":[],"_links":{"self":[{"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/posts\/1079"}],"collection":[{"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/comments?post=1079"}],"version-history":[{"count":0,"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/posts\/1079\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/media?parent=1079"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/categories?post=1079"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/tags?post=1079"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}