Cassandra \u662f\u4e00\u4e2a\u5206\u5e03\u5f0f\u952e\u503c\u5b58\u50a8\u7cfb\u7edf\uff0c\u7531 Facebook \u57282008\u5e74\u5f00\u6e90\u3002\u5b83\u662f\u7531 Amazon Dynamo \u7684\u5176\u4e2d\u4e00\u4f4d\u521b\u4f5c\u8005 Avinash Lakshman \u548c Facebook \u7684\u5de5\u7a0b\u5e08 Prashant Malik \u8bbe\u8ba1\u7684\u3002<\/p>\n
Cassandra \u80fd\u5920\u5728\u5546\u696d\u786c\u9ad4\u548c\u96f2\u7aef\u57fa\u790e\u67b6\u69cb\u4e0a\u63d0\u4f9b\u9ad8\u53ef\u7528\u6027\u3001\u7dda\u6027\u64f4\u5c55\u6027\u548c\u5bb9\u932f\u80fd\u529b\u3002<\/p>\n
<\/p>\n
<\/p>\n
\u5728\u5206\u6563\u8ba1\u7b97\u4e2d\uff0c\u6709\u4e00\u4e2a\u8457\u540d\u7684\u5b9a\u7406\u53eb\u505aCAP\u5b9a\u7406\uff0c\u91cd\u70b9\u63d0\u53ca\u4e86AP\u3002<\/p>\n
Apache Cassandra is a powerful database management system that provides high availability and scalability for handling large amounts of data. To learn more about Apache Cassandra, visit their official website at http:\/\/cassandra.apache.org\/.<\/p>\n
\u5728\u4ee5MySQL\u4e3a\u4ee3\u8868\u7684\u9762\u5411\u884c\u7684\u6570\u636e\u5e93\u4e2d\uff0c\u9002\u5408\u5904\u7406\u7531\u5c11\u6570\u884c\u7ec4\u6210\u7684\u591a\u5217\u6570\u636e\uff0c\u4f46\u4e0d\u9002\u5408\u5bf9\u5927\u91cf\u884c\u8fdb\u884c\u5bf9\u5c11\u6570\u5217\u7684\u66f4\u6539\u7b49\u64cd\u4f5c\u3002\u800c\u5217\u5411\u6570\u636e\u5e93\u5219\u5177\u6709\u76f8\u53cd\u7684\u7279\u6027\u3002<\/p>\n
\u53ea\u9700\u8981\u4e00\u4e2a\u9009\u9879\u3002
\n\u6bd4\u5982\u8bf4\uff0c\u5982\u679c\u8981\u5904\u7406\u5927\u91cf\u7684\u670d\u52a1\u5668\u65e5\u5fd7\u7b49\u6570\u636e\uff0c\u4f46\u5b9e\u9645\u4e0a\u53ea\u4f7f\u75282\u52303\u5217\u7684\u60c5\u51b5\u4e0b\uff0c\u7406\u8bba\u4e0a\u53ef\u4ee5\u8bf4\u5217\u5411\u6570\u636e\u5e93\u66f4\u4f18\u79c0\u3002
\n\u76f8\u53cd\uff0c\u5728\u5904\u7406\u670d\u52a1\u5668\u65e5\u5fd7\u7684\u60c5\u51b5\u4e0b\uff0c\u5982\u679c\u9700\u8981\u540c\u65f6\u4f7f\u7528\u591a\u5217\u7684\u7ed3\u679c\uff0c\u5217\u5411\u6570\u636e\u5e93\u53ef\u80fd\u4e0d\u662f\u6700\u4f73\u9009\u62e9\uff08\u7136\u800c\uff0c\u5bf9\u4e8e\u65f6\u95f4\u5e8f\u5217\u6570\u636e\u6765\u8bf4\uff0c\u5173\u7cfb\u578b\u6570\u636e\u5e93\u4e5f\u4e0d\u662f\u7279\u522b\u64c5\u957f\u7684\u9886\u57df\uff09\u3002<\/p>\n
\u597d\u7684\uff0c\u6211\u4eec\u6765\u4eb2\u81ea\u5c1d\u8bd5\u4eceRails\u4f7f\u7528Cassandra\u3002
\n\u8fd9\u6b21\u6211\u4eec\u5c06\u5728MacBook\u4e0a\u5efa\u7acb\u4e00\u4e2a\u75311\u4e2a\u8282\u70b9\u7ec4\u6210\u7684Cassandra\u96c6\u7fa4\u5e76\u8fdb\u884c\u4f7f\u7528\u3002<\/p>\n
Cassandra \u53ef\u4ee5\u4ece Apache Cassandra \u5b98\u7f51\u4e0b\u8f7d\uff0c\u4f46\u5bf9\u4e8e Mac \u7528\u6237\u6765\u8bf4\uff0c\u53ea\u9700\u901a\u8fc7 Homebrew \u6267\u884c\u4ee5\u4e0b\u547d\u4ee4\u5373\u53ef\u8fdb\u884c\u5b89\u88c5\uff0c\u56e0\u6b64\u6211\u4eec\u5c06\u4f7f\u7528\u8fd9\u79cd\u65b9\u5f0f\u8fdb\u884c\u5b89\u88c5\u3002<\/p>\n
$ <\/span>brew install <\/span>cassandra\r\n<\/code><\/pre>\n\u5f53\u5b89\u88c5\u5b8c\u6210\u540e\uff0c\u8f93\u5165\u4ee5\u4e0b\u547d\u4ee4\uff0c\u5373\u53ef\u4f7fCassandra\u5728\u524d\u53f0\u8fd0\u884c\u3002
\n\u5982\u9700\u5728\u5b88\u62a4\u8fdb\u7a0b\u6a21\u5f0f\u4e0b\u542f\u52a8\uff0c\u8bf7\u5220\u9664-f\u9009\u9879\u3002<\/p>\n
$ <\/span>cassandra -f<\/span>\r\n<\/code><\/pre>\n\u5f53\u4ee5\u524d\u53f0\u65b9\u5f0f\u542f\u52a8\u65f6\uff0c\u7ec8\u7aef\u4f1a\u5360\u7528\u6574\u4e2a\u5c4f\u5e55\u3002\u56e0\u6b64\uff0c\u8bf7\u5728\u65b0\u7684\u7ec8\u7aef\u4e2d\u6253\u5f00\u6216\u4f7f\u7528tmux\u7b49\u65b9\u6cd5\u5728\u53e6\u4e00\u4e2a\u7a97\u53e3\u4e2d\u8fdb\u884c\u542f\u52a8\u3002<\/p>\n
\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u4f7f\u7528Rails\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5e94\u7528\u7a0b\u5e8f\u3002\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\uff0c\u6211\u4eec\u5c06\u8df3\u8fc7\u4f7f\u7528ActiveRecord\u3002<\/p>\n
$ <\/span>rails new CassandraRails --skip-active-record<\/span>\r\n<\/code><\/pre>\n\u4e3a\u4e86\u4f7f\u7528\u7c7b\u4f3c\u4e8eActiveRecord\u7684\u63a5\u53e3\u6765\u64cd\u4f5cCassandra\uff0c\u60a8\u53ef\u4ee5\u5c06cequel\u6dfb\u52a0\u5230Gemfile\u4e2d\u3002<\/p>\n
gem<\/span> 'cequel'<\/span>\r\n<\/code><\/pre>\n\u7136\u540e\uff0c\u6309\u7167\u60ef\u4f8b\u6267\u884c bundle install \u547d\u4ee4\uff0c\u5b89\u88c5\u6240\u9700\u7684 gem\u3002\u5e94\u8be5\u4f1a\u5b89\u88c5 cequel \u548c cassandra-driver\u3002<\/p>\n
\u5b8c\u6210\u5b89\u88c5\u540e\uff0c\u8fdb\u884c\u8bbe\u7f6e\u64cd\u4f5c\u3002<\/p>\n
$ <\/span>rails g cequel:configuration\r\n<\/code><\/pre>\n\u901a\u8fc7\u8fd9\u4e2a\u64cd\u4f5c\uff0c\u5c06\u521b\u5efa\u4e00\u4e2aconfig\/cequel.yml\u6587\u4ef6\u3002
\n\u5176\u5185\u5bb9\u5927\u81f4\u662f\u5173\u4e8eCassandra\u96c6\u7fa4\u7684\u4fe1\u606f\u3002
\n\u8fd9\u6b21\u6211\u4eec\u5148\u5728\u672c\u5730\u4e3b\u673a\u4e0a\u642d\u5efa\u4e00\u4e2a\u53ea\u6709\u4e00\u4e2a\u8282\u70b9\u7684Cassandra\u96c6\u7fa4\uff0c\u4f5c\u4e3a\u5f00\u53d1\u73af\u5883\uff0c\u6240\u4ee5\u53ef\u4ee5\u4f7f\u7528\u9ed8\u8ba4\u8bbe\u7f6e\u3002<\/p>\n
\u6700\u540e\uff0c\u6211\u4eec\u5c06\u5728Cassandra\u4e0a\u521b\u5efa\u4e00\u4e2akeyspace\u3002\u8fd9\u7c7b\u4f3c\u4e8e\u5173\u7cfb\u578b\u6570\u636e\u5e93\u4e2d\u7684DB\u3002<\/p>\n
$ rake cequel:keyspace:create\r\n<\/code><\/pre>\n\u8fd9\u6837\u8bbe\u7f6e\u5c31\u5b8c\u6210\u4e86\u3002\u6211\u4eec\u8bd5\u7740\u521b\u5efa\u4e00\u4e2a\u5b58\u50a8\u63a8\u6587\u4fe1\u606f\u7684Tweet\u6a21\u578b\u3002<\/p>\n
class<\/span> Tweet<\/span>\r\n include<\/span> Cequel<\/span>::<\/span>Record<\/span>\r\n\r\n key<\/span> :id<\/span>,<\/span> :text<\/span>\r\n column<\/span> :username<\/span>,<\/span> :text<\/span>\r\n column<\/span> :body<\/span>,<\/span> :text<\/span>\r\n column<\/span> :retweeted<\/span>,<\/span> :int<\/span>\r\n column<\/span> :favarited<\/span>,<\/span> :int<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n\u7531\u4e8e\u4e0d\u4f1a\u81ea\u52a8\u521b\u5efa\u4e3b\u952e\uff0c\u6240\u4ee5\u9700\u8981\u660e\u786e\u6307\u5b9a\u3002\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u6307\u5b9a\u4e86\u952e\uff1aid\u548ctext\uff0c\u5e76\u4e14\u5047\u8bbetweet_id\u4f5c\u4e3a\u81ea\u7136\u4e3b\u952e\u6765\u521b\u5efa\u3002\u867d\u7136\u672c\u6b21\u672a\u4f7f\u7528\uff0c\u4f46\u4f3c\u4e4e\u53ef\u4ee5\u4f7f\u7528belongs_to\/has_many\u7b49\u3002\u987a\u4fbf\u63d0\u4e00\u4e0b\uff0c\u5728\u7528\u4e8eCassandra\u7684\u67e5\u8be2\u8bed\u8a00CQL\u4e2d\uff0c\u6709\u4e00\u4e2aCQL\u6570\u636e\u7c7b\u578b\u7684\u6e05\u5355\u53ef\u4f9b\u4f7f\u7528\u3002\u8981\u5728cequel\u4e2d\u4f7f\u7528\u96c6\u5408\u7c7b\u578b\uff08list\uff0cset\uff0cmap\uff09\uff0c\u53ef\u4ee5\u5728\u6a21\u578b\u4e2d\u5982\u4e0b\u63cf\u8ff0\u3002<\/p>\n
class<\/span> Tweet<\/span>\r\n include<\/span> Cequel<\/span>::<\/span>Record<\/span>\r\n\r\n \uff08\u4e2d\u7565\uff09<\/span>\r\n set<\/span> :reply_to<\/span>,<\/span> :text<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n\u5f53\u6a21\u578b\u63cf\u8ff0\u5b8c\u6210\u540e\uff0c\u6267\u884c\u8fc1\u79fb\u64cd\u4f5c\u3002<\/p>\n
$ <\/span>rake cequel:migrate\r\nSynchronized schema for <\/span>Tweet\r\n<\/code><\/pre>\n\u8fdb\u884c\u8fc1\u79fb\u64cd\u4f5c\u65f6\uff0c\u4e0d\u4f1a\u6dfb\u52a0\u8fc1\u79fb\u6587\u4ef6\u3002<\/p>\n
\u6211\u5011\u5df2\u7d93\u6e96\u5099\u597d\u5f9eRails\u4f7f\u7528Cassandra\u4e86\uff0c\u73fe\u5728\u8b93\u6211\u5011\u5617\u8a66\u5f9erails console\u8f38\u5165\u6578\u64da\u3002<\/p>\n
$ <\/span>rails c\r\nLoading development environment (<\/span>Rails 4.2.1)<\/span>\r\n\r\nirb(<\/span>main)<\/span>:001:0> t =<\/span> Tweet.new(<\/span>id<\/span>: 't123'<\/span>)<\/span>\r\n=><\/span> #<Tweet id: \"t123\", username: nil, body: nil, retweeted: nil, favarited: nil, reply_to: #<Set: {}>><\/span>\r\n\r\nirb(<\/span>main)<\/span>:002:0> t.username =<\/span> '_c_hase'<\/span>\r\n=><\/span> \"_c_hase\"<\/span>\r\n\r\nirb(<\/span>main)<\/span>:003:0> t.reply_to <<<\/span> '<\/span>t122<\/span>'\r\n=> #<Set: {\"t122\"}>\r\n\r\nirb(main):004:0> t.save\r\n=> true\r\n<\/span><\/code><\/pre>\n\u4ee5\u7c7b\u4f3c\u4f7f\u7528 ActiveRecord \u7684\u65b9\u5f0f\uff0c\u6211\u4eec\u53ef\u4ee5\u8bbf\u95ee Cassandra\uff08\u4e3a\u4e86\u6613\u8bfb\u6027\uff0c\u8fd9\u91cc\u52a0\u4e86\u6362\u884c\u7b26\uff09\u3002
\nfind \u65b9\u6cd5\u53ef\u4ee5\u5bf9\u6a21\u578b\u4e2d\u6307\u5b9a\u7684\u952e\u6267\u884c\u64cd\u4f5c\u3002<\/p>\n
><\/span> t<\/span> =<\/span> Tweet<\/span>.<\/span>find<\/span>(<\/span>'t123'<\/span>)<\/span>\r\n=><\/span> #<Tweet id: \"t123\", body: nil, favarited: nil, reply_to: #<Set: {\"t122\"}>, retweeted: nil, username: \"_c_hase\"><\/span>\r\n\r\n><\/span> t<\/span>.<\/span>username<\/span>\r\n=><\/span> \"_c_hase\"<\/span>\r\n<\/code><\/pre>\n\u7136\u800c\uff0c\u5f53\u5c1d\u8bd5\u4f7f\u7528where\u65b9\u6cd5\u8fdb\u884c\u7b5b\u9009\u65f6\uff0c\u4f1a\u89e6\u53d1ArgumentError\u9519\u8bef\uff0c\u7c7b\u4f3c\u4e8eRDB\u3002<\/p>\n
> Tweet.where(username: '_c_hase')\r\nArgumentError: Can't scope by non-indexed column username\r\n<\/code><\/pre>\n\u5982\u679c\u60a8\u60f3\u6839\u636e\u7279\u5b9a\u5217\u8fdb\u884c\u7b5b\u9009\uff0c\u5c31\u9700\u8981\u6839\u636e\u9519\u8bef\u4ee3\u7801\u521b\u5efa\u7d22\u5f15\u3002<\/p>\n
$<\/span> git diff\r\ndiff --git a\/app\/models\/tweet.rb b\/app\/models\/tweet.rb\r\nindex 80d2400..be18e40 100644\r\n<\/span>--- a\/app\/models\/tweet.rb\r\n<\/span>+++ b\/app\/models\/tweet.rb\r\n<\/span>@@ -2,7 +2,7 @@<\/span> class Tweet\r\n include Cequel::Record\r\n\r\n key :id, :text\r\n- column :username, :text\r\n<\/span>+ column :username, :text, :index => true\r\n<\/span> column :body, :text\r\n column :retweeted, :int\r\n column :favarited, :int\r\n<\/code><\/pre>\n\u8bf7\u5728\u6267\u884c\u8fc1\u79fb\u65f6\u6ce8\u610f\uff0c\u4f1a\u81ea\u52a8\u8d34\u4e0a\u7d22\u5f15\uff0c\u6240\u4ee5\u8bf7\u52a1\u5fc5\u6267\u884c $ rake cequel:migrate\u3002<\/p>\n
><\/span> Tweet<\/span>.<\/span>where<\/span>(<\/span>username: <\/span>'_c_hase'<\/span>)<\/span>\r\n=><\/span> [<\/span>#<Tweet id: \"t123\", body: nil, favarited: nil, reply_to: #<Set: {\"t122\"}>, retweeted: nil, username: \"_c_hase\">]<\/span>\r\n<\/code><\/pre>\n\u603b\u7ed3<\/h2>\n
\u901a\u8fc7\u4f7f\u7528cequel, \u6211\u4eec\u786e\u8ba4\u53ef\u4ee5\u50cf\u4f7f\u7528ActiveRecord\u4e00\u6837\u64cd\u4f5cCassandra\u3002\u5c3d\u7ba1\u5b83\u4ecd\u7136\u5904\u4e8e\u53d1\u5c55\u4e2d\u7684\u72b6\u6001\uff0c\u4f46\u5728\u5904\u7406\u65f6\u95f4\u5e8f\u5217\u6570\u636e\u7b49\u65b9\u9762\u975e\u5e38\u65b9\u4fbf\uff0c\u5efa\u8bae\u8003\u8651\u4e00\u4e0b\u662f\u5426\u4f7f\u7528\u5b83\u3002<\/p>\n
\u4e0b\u6b21\u4f1a\u901a\u77e5<\/h2>\n
\u6211\u5e0c\u671b\u80fd\u4ece\u66f4\u7406\u8bba\u7684\u89d2\u5ea6\u5bf9Cassandra\u8fdb\u884c\u5b9e\u9a8c\u548c\u63a2\u8ba8\u3002
\n\u6211\u8ba4\u4e3a\u8fd9\u7bc7\u4e3b\u8981\u662f\u5173\u4e8eCassandra\u7684\u6587\u7ae0\uff0c\u9644\u5e26\u4e00\u70b9\u5173\u4e8e\u5728Rails\u4e0a\u4f7f\u7528\u7684\u5185\u5bb9\u3002<\/p>\n
\u9644\u5f55<\/h2>\n
\u7531\u4e8e\u672c\u6837\u4f8b\u9879\u76ee\u5c06\u6765\u8fd8\u4f1a\u8fdb\u884c\u6269\u5145\uff0c\u6240\u4ee5\u4ee3\u7801\u5df2\u7ecf\u4e0a\u4f20\u5230\u4e86github\uff08\u63d0\u4ea4\u53f7\u4e3a2b93f1211ace3ffde4c0217a32b4d2a29ba6dcda\uff09\u3002
\nhttps:\/\/github.com\/chase0213\/CassandraRailsSample<\/p>\n","protected":false},"excerpt":{"rendered":"
Cassandra\u662f\u4ec0\u4e48\uff1f Cassandra \u662f\u4e00\u4e2a\u5206\u5e03\u5f0f\u952e\u503c\u5b58\u50a8\u7cfb\u7edf\uff0c\u7531 Facebook \u57282008\u5e74\u5f00 […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-50112","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n
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