{"id":1162,"date":"2008-11-09T14:12:00","date_gmt":"2008-11-09T06:12:00","guid":{"rendered":"http:\/\/www.brofive.org\/?p=1162"},"modified":"2018-05-03T01:17:56","modified_gmt":"2018-05-02T17:17:56","slug":"%e5%85%a8%e6%96%87%e7%bf%bb%e8%af%91%e8%bd%af%e4%bb%b6%e5%92%8c%e6%9c%8d%e5%8a%a1%e6%af%94%e8%be%83%e4%b9%8b%e4%ba%8c","status":"publish","type":"post","link":"http:\/\/www.brofive.net\/?p=1162","title":{"rendered":"\u5168\u6587\u7ffb\u8bd1\u8f6f\u4ef6\u548c\u670d\u52a1\u6bd4\u8f83\u4e4b\u4e8c"},"content":{"rendered":"

\u7ee7\u7eed\u8bd5\u7528\u4e86\u4e00\u4e9b\u6536\u8d39\u8f6f\u4ef6\uff0c\u611f\u89c9Dr. Eye 2003\u53ef\u4ee5\u6839\u636e\u4e0a\u4e0b\u6587\u786e\u5b9a\u591a\u4e49\u8bcd\u7684\u542b\u4e49\uff0c\u4f46\u662f\u53f7\u79f0\u4e13\u4e1a\u5316\u7ffb\u8bd1\u8f6f\u4ef6\u7684\u96c5\u4fe1CAT3.5\u5374\u65e0\u6cd5\u6b63\u786e\u8bc6\u522b\uff0c\u5f53\u7136\u96c5\u4fe1\u7684\u7279\u70b9\u662f\u4ea4\u4e92\u5f0f\u7ffb\u8bd1\uff0c\u56e0\u6b64\u521d\u6b21\u7ffb\u8bd1\u9519\u8bef\u53ef\u80fd\u4e5f\u662f\u53ef\u4ee5\u63a5\u6536\u7684 – \u5982\u679c\u4e0d\u8003\u8651\u5176\u5b66\u4e60\u66f2\u7ebf\u3002 <\/p>\n

\u6298\u817e\u8fd9\u4e48\u4e9b\uff0c\u611f\u89c9\u8fd8\u662f\u7b80\u5355\u514d\u8d39\u7684Google\u5168\u6587\u7ffb\u8bd1\u6bd4\u8f83\u5b9e\u7528\uff0c\u6709\u7ecf\u9a8c\u7684\u7f51\u53cb\u4e0d\u541d\u6307\u6559\uff01 <\/p>\n

\n

An interesting aspect of this implementation is that the only role of the coordinator is to decide upon the group of sites, to create the ZooKeeper nodes, and to propagate the transaction to the corresponding sites. In fact, even propagating the transaction can be done through ZooKeeper by writing it in the transaction node. <\/p>\n

There are two important drawbacks of the approach described above. One is the message complexity, which is O(n\u00b2). The second is the impossibility of detecting failures of sites through ephemeral nodes. To detect the failure of a site using ephemeral nodes, it is necessary that the site create the node. <\/p>\n

To solve the first problem, you can have only the coordinator notified of changes to the transaction nodes, and then notify the sites once coordinator reaches a decision. Note that this approach is scalable, but it’s is slower too, as it requires all communication to go through the coordinator. <\/p>\n

\n

Dr. Eye2003\u7684\u7ffb\u8bd1\u7ed3\u679c\uff1a <\/p>\n

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\u89e3\u51b3\u7b2c\u4e00\u4e2a\u95ee\u9898, \u4f60(\u4eec)\u80fd\u53ea\u6709\u5230(\u8fd9\u4e9b)\u5904\u7406\u4e8b\u52a1\u8282\u70b9\u901a\u77e5\u53d8\u5316\u7684\u534f\u8c03\u5b98, \u7136\u540e\u4e00\u65e6\u534f\u8c03\u5b98\u8fbe\u5230\u51b3\u5b9a\u901a\u77e5\u5730\u70b9(\u573a\u6240)\u3002 \u6307\u51fa(\u6ce8\u610f\u5230)\u8fd9\u4e2a\u65b9\u6cd5\u662f\u53ef\u6500\u767b, \u4f46\u662f, \u5b83(\u8fd9)\u662f\u4e5f\u66f4\u6162\u901f, \u5982\u540c\u5b83(\u8fd9)\u8981\u6c42\u6240\u6709\u901a\u4fe1\u901a\u8fc7(\u68c0\u67e5)\u8fd9\u4e2a\u534f\u8c03\u5b98\u3002 <\/p>\n

\n

\u96c5\u4fe1CAT3.5\u7684\u7ffb\u8bd1\u7ed3\u679c\uff1a <\/p>\n

\"cat\"<\/a> <\/p>\n

\u76f8\u5173\u8d44\u6e90\uff1a
1. \u5168\u6587\u7ffb\u8bd1\u8f6f\u4ef6\u548c\u670d\u52a1\u4e4b\u4e00 – \u514d\u8d39\u5348\u9910<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

\u7ee7\u7eed\u8bd5\u7528\u4e86\u4e00\u4e9b\u6536\u8d39\u8f6f\u4ef6\uff0c\u611f\u89c9Dr. Eye 2003\u53ef\u4ee5\u6839\u636e\u4e0a\u4e0b\u6587\u786e\u5b9a\u591a\u4e49\u8bcd\u7684\u542b\u4e49\uff0c\u4f46\u662f\u53f7\u79f0\u4e13\u4e1a\u5316\u7ffb\u8bd1\u8f6f\u4ef6\u7684\u96c5…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,212],"tags":[214],"views":3074,"_links":{"self":[{"href":"http:\/\/www.brofive.net\/index.php?rest_route=\/wp\/v2\/posts\/1162"}],"collection":[{"href":"http:\/\/www.brofive.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.brofive.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.brofive.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.brofive.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1162"}],"version-history":[{"count":1,"href":"http:\/\/www.brofive.net\/index.php?rest_route=\/wp\/v2\/posts\/1162\/revisions"}],"predecessor-version":[{"id":1163,"href":"http:\/\/www.brofive.net\/index.php?rest_route=\/wp\/v2\/posts\/1162\/revisions\/1163"}],"wp:attachment":[{"href":"http:\/\/www.brofive.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1162"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.brofive.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1162"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.brofive.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1162"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}