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构建高并发高可用的电商平台架构实践 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...sharding是一一对应的，只访问一个数据库sharding.
biz业务注册节点到zookeeper上/bizs/shard/下。
router监听zookeeper上/bizs/下节点状态，缓存在线biz在router中。
client请求router获取biz时，router首先从mongodb中获取用户对应的shard,router根据缓...
Difference between partition key, composite key and clustering key in Cassandra?
...this efficiently given reads are predominant in this case? Like that (from offical Cassandra guide):
CREATE TABLE group_join_dates (
groupname text,
joined timeuuid,
join_date text,
username text,
email text,
age int,
PRIMARY KEY ((groupname, join_date), joined)
) WITH C...
How can I use if/else in a dictionary comprehension?
...ry comprehension
I am working on data-entry desktop application for my own office work, and it is common for such data-entry application to get all entries from input widget and dump it into a dictionary for further processing like validation, or editing which we must return selected data from file ...
Android微信智能心跳方案 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...使用GCM作为辅助通道，在支持GCM的设备上微信上传自己的注册GCM ID给微信Server。
微信Server在发现长连接失效的情况下，可以使用GCM 作为辅助通道通知客户端有新消息，客户端收到push通知后做一次sync。
只利用GCM来激活微信，...
来自微软的一手内幕：Windows 10是怎么出炉的 - 创意 - 清泛网 - 专注C/C++及内核技术
...，微软针对Windows 10开放了500万个内测名额。谁都可以来注册体验一番。即使今天Windows 10已经发布了，但是微软也仍旧在跟进用户们的反馈，并予以改进。
“其实，这样做有时难免还是会担心。”Myerson说道。“一件事在没搞...
What's the difference between getRequestURI and getPathInfo methods in HttpServletRequest?
...
I'm printing your answer and put it up as a poster on our office. That's how useful it is!
– Ibrahim Arief
Dec 17 '15 at 8:05
2
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Where do I find the current C or C++ standard documents?
...elow versions require Authentication
2004-11-05: N1733
2004-07-16: N1655 Unofficial
2004-02-07: N1577 C++03 (Or Very Close)
2001-09-13: N1316 Draft Expanded Technical Corrigendum
1997-00-00: N1117 Draft Expanded Technical Corrigendum
The following all draft versions of the standard:
All the follow...
Is SQL or even TSQL Turing Complete?
This came up at the office today. I have no plans of doing such a thing, but theoretically could you write a compiler in SQL? At first glance it appears to me to be turing complete, though extremely cumbersome for many classes of problems.
...
Is a successor for TeX/LaTeX in sight? [closed]
...d as something of an
also-ran it retains several niche
markets such as law offices and is
reasonably good (at least significantly
better than Word) for large, complex
and heavily cross-referenced documents.
Microsoft Word. Not
recommended for serious technical
publication tasks due to its
instabilit...
Should I use pt or px?
..."approximate" regarding the measurements.
Further, typewriters as used in offices, had either and "Elite" or a "Pica" size where the size was 10 and 12 characters per inch repectivly.
Additionally, the "point", prior to standardization was based on the metal typographers "foot" size, the size of t...