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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
...能在数据库层做全局排队是最理想的，淘宝的数据库团队开发了针对这种MySQL的InnoDB层上的patch，可以做到数据库层上对单行记录做到并发排队，如图6所示。
重要的几个：其中关键部分包括：
这个热点服务后台抓取热...
When should I use uuid.uuid1() vs. uuid.uuid4() in python?
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My team just ran into trouble using UUID1 for a database upgrade script where we generated ~120k UUIDs within a couple of minutes. The UUID collision led to violation of a primary key constraint.
We've upgraded 100s of servers but on our Amazon EC2 instances we ran into this issue a few t...
How do I see a C/C++ source file after preprocessing in Visual Studio?
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For C++ code, it's actually a lot harder. For GCC/g++, I found this Perl script useful.
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Best way to use Google's hosted jQuery, but fall back to my hosted library on Google fail
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You can achieve it like this:
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></script>
<script>
window.jQuery || document.write('<script src="/path/to/your/jquery"><\/script>');
</script...
Create a new object from type parameter in generic class
...passing the type into the constructor.
class TestOne {
hi() {
alert('Hi');
}
}
class TestTwo {
constructor(private testType) {
}
getNew() {
return new this.testType();
}
}
var test = new TestTwo(TestOne);
var example = test.getNew();
example.hi();
You c...
When to use IMG vs. CSS background-image?
...er {
background-image:url(image_2.jpg);
}
This saves any kind of JavaScript or jQuery animation to fade an <img/>'s src.
More information about transitions on MDN.
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Java compile speed vs Scala compile speed
...la seems to consume a lot of time. I hear that with many large projects a scripting language becomes very important because of the time compiling takes, a need that I didn't see arising when I was using Java.
...
rails - Devise - Handling - devise_error_messages
....errors.any? %>
<div id="error_explanation">
<div class="alert alert-danger alert-dismissable">
<button type="button" class="close" data-dismiss="alert" aria-hidden="true">&times;</button>
<p><strong>This form contains <%= pluralize(obj...
Apache Prefork vs Worker MPM
...d into the server by using the argument --with-mpm=NAME with the configure script where NAME is the name of the desired MPM.
Apache will use a default MPM for each operating system unless a different one is choosen at compile-time (for instance on Windows mpm_winnt is used by default). Here's the l...
What do the python file extensions, .pyc .pyd .pyo stand for?
...c’ or ‘.pyo’ files is the speed with which they are loaded.
When a script is run by giving its name on the command line, the bytecode for the script is never written to a ‘.pyc’ or ‘.pyo’ file. Thus, the startup time of a script may be reduced by moving most of its code to a module a...