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分布式系统的事务处理 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术

...个Master都提供read-write服务。这个模型是Master-Slave的加强,数据间同步一般是通过Master间的异步完成,所以是最终一致性。 Master-Master的好处是,一台Master挂了,别的Master可以正常做读写服务,他和Master-Slave一样,当数据没有被...
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正则表达式 30 分钟入门教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...e 30 Minute Regex Tutorial。由于评论里有过长的URL,所以本页排比较... 来园子之前写的一篇正则表达式教程,部分翻译自codeproject的The 30 Minute Regex Tutorial。 由于评论里有过长的URL,所以本页排比较混乱,推荐你到原处...
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C++并发编程(中文) - 文档下载 - 清泛网 - 专注C/C++及内核技术

...并发… 1 1.1.1 计算机系统的并发… 1 1.1.2 并发的方法… 3 1.2 为什么使用并发… 4 1.2.1 因划分重点而使用并发… 5 1.2.2 为了提高性能而使用并发… 5 1.2.3 什么时候不使用并发… 6 1.3 在C++中使用并发和多线程… 7 1.3.1 多线程...
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How do I make a matrix from a list of vectors in R?

...ne option is to use do.call(): > do.call(rbind, a) [,1] [,2] [,3] [,4] [,5] [,6] [1,] 1 1 2 3 4 5 [2,] 2 1 2 3 4 5 [3,] 3 1 2 3 4 5 [4,] 4 1 2 3 4 5 [5,] 5 1 2 3 4 5 [6,] 6 1 2 3 ...
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Calculate difference in keys contained in two Python dictionaries

... 234 You can use set operations on the keys: diff = set(dictb.keys()) - set(dicta.keys()) Here is...
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Summarizing multiple columns with dplyr? [duplicate]

...df %>% group_by(grp) %>% summarise_all(list(mean)) #> # A tibble: 3 x 5 #> grp a b c d #> <int> <dbl> <dbl> <dbl> <dbl> #> 1 1 3.08 2.98 2.98 2.91 #> 2 2 3.03 3.04 2.97 2.87 #> 3 3 2.85 2.95 2.95 3.06...
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Regular expression that matches valid IPv6 addresses

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What are the differences between json and simplejson Python modules?

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What is the ultimate postal code and zip regex?

... 132 There is none. Postal/zip codes around the world don't follow a common pattern. In some countr...
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Applying a function to every row of a table using dplyr?

... | edited Aug 6 '19 at 3:20 answered Jul 14 '14 at 0:20 ...