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淘宝应对双\"11\"技术架构分析 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术

...利用各个节点并行计算能力,并且避免大量明细数据网络传输开销。 用中间层隔离前后端 上文提到过,MyFOX和Prom为数据产品不同需求提供了数据存储和底层查询解决方案,但随之而来问题是,各种异构存储模块...
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华为公司新产品研发流程管理 - 项目管理 - 清泛网 - 专注C/C++及内核技术

...了捷报:华为将为荷兰移动通信运营商telfort建设第三代网络。这是华为首份欧洲合同。对于这桩价值数亿欧元交易,用华为总裁任正非话来说,“在华为成为全球规模移动解决方案供应商道路上,这是向前迈出一...
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Symfony2 : How to get form validation errors after binding the request to the form

... To get proper (translatable) messages, currently using SF 2.6.3, here is my final function (as none of above's seem to work anymore): private function getErrorMessages(\Symfony\Component\Form\Form $form) { $errors = array(); ...
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搭建高可用mongodb集群(四)—— 分片 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术

...要光想到存储空间,实际运行数据库还有硬盘读写、网络IO、CPU和内存瓶颈。在mongodb集群只要设置好了分片规则,通过mongos操作数据库就能自动把对应数据操作请求转发到对应分片机器上。在生产环境中分片片键...
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When to use LinkedList over ArrayList in Java?

...iki 25 revs, 16 users 33%Jonathan Tran 187 ...
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Mozilla PDF.js:PDF在线预览 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...ice中创建大量微小图像,矢量元素/图片); 5.使用网络优化格式PDF; 6.修复或不产生不符合PDF32000规范PDF文件。 回答网友提问 2015-1-19 chrome是可以通过参数传值方式打开PDF,我用版本是39.0.2171.95 m 回答...
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When should I use semicolons in SQL Server?

...nator. It is a part of the ANSI SQL-92 standard, but was never used within Transact-SQL. Indeed, it was possible to code T-SQL for years without ever encountering a semicolon. Usage There are two situations in which you must use the semicolon. The first situation is where you use a Common Table Ex...
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淘宝大秒系统设计详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...条SQL后直接根据TARGET_AFFECT_ROW结果提交或回滚,可以减少网络等待时间(平均约0.7ms)。据我所知,目前阿里MySQL团队已将这些patch及提交给MySQL官方评审。 大促热点问题思考 以秒杀这个典型系统为代表热点问题根据多年经...
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How to check if field is null or empty in MySQL?

...F(d.narr IS NULL OR d.narr='''',t.narration,d.narr) AS NARRATION FROM trans_m AS t JOIN trans_dtl AS d ON(t.ID=d.TRANSID) JOIN acc_head L ON(D.ACC_ID=L.ID) JOIN VOUCHERTYPE_M AS V ON(T.VOUCHERTYPE=V.ID) WHERE T.CMPID=',COMPANYID,' AND d.ACC_ID=',LEDGERID ,' AND t.entdt>=''',F...
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Label encoding across multiple columns in scikit-learn

... You can easily do this though, df.apply(LabelEncoder().fit_transform) EDIT2: In scikit-learn 0.20, the recommended way is OneHotEncoder().fit_transform(df) as the OneHotEncoder now supports string input. Applying OneHotEncoder only to certain columns is possible with the Column...