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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/...
...点的选举机制，自动选举一位新的主服务器。看起来很牛X的样子，我们赶紧操作部署一下！
官方推荐的副本集机器数量为至少3个，那我们也按照这个数量配置测试。
1、准备两台机器 192.168.1.136、192.168.1.137、192.168.1.138。 192.16...
Why should casting be avoided? [closed]
...es (more or less) a fourth answer.
Since it's the one you didn't mention explicitly, I'll start with C. C casts have a number of problems. One is that they can do any of a number of different things. In some cases, the cast does nothing more than tell the compiler (in essence): "shut up, I know wha...
Can I 'git commit' a file and ignore its content changes?
...
Sure, I do exactly this from time to time using
git update-index --assume-unchanged [<file> ...]
To undo and start tracking again (if you forgot what files were untracked, see this question):
git update-index --no-assume-unchanged...
__lt__ instead of __cmp__
Python 2.x has two ways to overload comparison operators, __cmp__ or the "rich comparison operators" such as __lt__ . The rich comparison overloads are said to be preferred, but why is this so?
...
Is there any advantage of using map over unordered_map in case of trivial keys?
... and if you can't afford them, then you can't use it.
Just from personal experience, I found an enormous improvement in performance (measured, of course) when using unordered_map instead of map in a main entity look-up table.
On the other hand, I found it was much slower at repeatedly inserting an...
How can I use different certificates on specific connections?
...ce(TrustManagerFactory.getDefaultAlgorithm());
tmf.init(keyStore);
SSLContext ctx = SSLContext.getInstance("TLS");
ctx.init(null, tmf.getTrustManagers(), null);
sslFactory = ctx.getSocketFactory();
If you need help creating the key store, please comment.
Here's an example of loading the key sto...
What is the difference between the remap, noremap, nnoremap and vnoremap mapping commands in Vim?
...
j will be mapped to gg. Q will also be mapped to gg, because j will be expanded for the recursive mapping. W will be mapped to j (and not to gg) because j will not be expanded for the non-recursive mapping.
Now remember that Vim is a modal editor. It has a normal mode, visual mode and other mode...
Start / Stop a Windows Service from a non-Administrator user account
...f DS objects.
CR: ADS_RIGHT_DS_CONTROL_ACCESS - Access allowed only after extended rights checks supported by the object are performed. This flag can be used alone to perform all extended rights checks on the object or it can be combined with an identifier of a specific extended right to perform onl...
Biggest GWT Pitfalls? [closed]
...sing GWT. Has anyone encountered any major pitfalls in using GWT (and GWT-EXT) that were unable to be overcome? How about from a performance perspective?
...
Does ruby have real multithreading?
...can only run one thread at a
time.
However, any number of C Threads (POSIX Threads etc.) can run
in parallel to the Ruby Thread, so external C Libraries, or MRI
C Extensions that create threads of their own can still run in
parallel.
The second implementation is YARV (short for "Yet
Another Ru...