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搭建高可用mongodb集群（二）—— 副本集 - 大数据 & AI - 清泛网 - 专注C/...
...
rs.initiate(config);
#输出成功
{
"info" : "Config now saved locally. Should come online in about a minute.",
"ok" : 1
}
#查看日志，副本集启动成功后，138为主节点PRIMARY，136、137为副本节点SECONDARY。
Sun Dec 29 20:26:13.842 [conn3]...
Check synchronously if file/directory exists in Node.js
...ated but fs.existsSync() is no longer deprecated. So you can safely use it now.
Original answer from 2010:
You can use statSync or lstatSync (docs link), which give you an fs.Stats object. In general, if a synchronous version of a function is available, it will have the same name as the async ver...
How to create a GUID/UUID using iOS
...ns the Unique ID of your iPhone.
EDIT: -[UIDevice uniqueIdentifier] is now deprecated and apps are being rejected from the App Store for using it. The method below is now the preferred approach.
If you need to create several UUID, just use this method (with ARC):
+ (NSString *)GetUUID
{
CFU...
Using SignalR with Redis messagebus failover using BookSleeve's ConnectionUtils.Connect()
...
The SignalR team has now implemented support for a custom connection factory with StackExchange.Redis, the successor to BookSleeve, which supports redundant Redis connections via ConnectionMultiplexer.
The initial problem encountered was that in...
How to write a large buffer into a binary file in C++, fast?
...es 2-5%.
Thanks a lot to everyone.
Update: 5 years have passed it's 2017 now. Compilers, hardware, libraries and my requirements have changed. That's why I made some changes to the code and did some new measurements.
First up the code:
#include <fstream>
#include <chrono>
#include &l...
How to make exe files from a node.js app?
...
For anyone stumbling upon this question, there are now two projects that create exes out of your node projects, Pkg and Electron.atom.io , they differ slightly:
Pkg will compile your project to native code, they also include assets AND a nodejs installation ( the s...
What are the alternatives now that the Google web search API has been deprecated? [closed]
...
Yes, Google Custom Search has now replaced the old Search API, but you can still use Google Custom Search to search the entire web, although the steps are not obvious from the Custom Search setup.
To create a Google Custom Search engine that searches th...
Recommended way to get hostname in Java
...
Not quite the answer I was hoping for but now I know how to ask a better question, thanks.
– Sam Hasler
Oct 19 '11 at 14:21
3
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How can I determine what font a browser is actually using to render some text?
...
Per Wilfred Hughes' answer, Firefox now supports this natively. This article has more details.
This answer original referenced the "Font Finder" plugin, but only because it was from 4 years ago. The fact that old answers linger like this and the community can...
Regular expression for floating point numbers
...tion.)
That said, most regex engines (actually, all of them, as far as I know) would accept \.. Most likely, there's an issue with escaping.
The Trouble with Escaping
Some languages have built-in support for regexes, such as JavaScript. For those languages that don't, escaping can be a problem.
...