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MongoDB副本集详解 优于以往的主从模式 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...照一些属性来判断谁应该胜出。这个属性可以是一个静态ID，也可以是更新的度量像最近一次事务ID（最新的节点会胜出）
他的选举过程大致如下：
? 得到每个服务器节点的最后操作时间戳。每个mongodb都有oplog机制会记录本机...
Commenting in a Bash script inside a multiline command
...r question:
echo abc `#Put your comment here` \
def `#Another chance for a comment` \
xyz, etc.
And for pipelines specifically, there is a clean solution with no overhead:
echo abc | # Normal comment OK here
tr a-z A-Z | # Another normal comment OK here
sort | # ...
The best way to remove duplicate values from NSMutableArray in Objective-C?
...
NSArray *copy = [mutableArray copy];
NSInteger index = [copy count] - 1;
for (id object in [copy reverseObjectEnumerator]) {
if ([mutableArray indexOfObject:object inRange:NSMakeRange(0, index)] != NSNotFound) {
[mutableArray removeObjectAtIndex:index];
}
index--;
}
[copy relea...
Ignore fields from Java object dynamically while sending as JSON from Spring MVC
I have model class like this, for hibernate
14 Answers
14
...
LINQ: When to use SingleOrDefault vs. FirstOrDefault() with filtering criteria
...
I must say that from performance wise, the FirstOrDefault is working about 10 times faster than SingleOrDefault , using a List<MyClass> of 9,000,000 elements, class contains 2 integers and the Func contains a search of these two integers. Sear...
Resize HTML5 canvas to fit window
...lieve I have found an elegant solution to this:
JavaScript
/* important! for alignment, you should make things
* relative to the canvas' current width/height.
*/
function draw() {
var ctx = (a canvas context);
ctx.canvas.width = window.innerWidth;
ctx.canvas.height = window.innerHeight;
...
Popup弹出菜单扩展 · App Inventor 2 中文网
...屏幕，而且配置视图的选项很少。这里介绍的扩展是Android弹出菜单的包装器。几乎所有属性都是可调的。
默认主题
黑色主题
功能概述
Popup弹出菜单扩展是一个And...
Why do access tokens expire?
...attacker can abuse a stolen token.
Large scale deployment don't want to perform a database lookup every API call, so instead they issue self-encoded access token which can be verified by decryption. However, this also means there is no way to revoke these tokens so they are issued for a short time a...
How does the “this” keyword work?
...hree different cases:
1. Initial global execution context
This is the case for JavaScript code that is evaluated at the top-level, e.g. when directly inside a <script>:
<script>
alert("I'm evaluated in the initial global execution context!");
setTimeout(function () {
alert("I'...
Does a UNIQUE constraint automatically create an INDEX on the field(s)?
Should I define a separate index on the email column (for searching purposes), or is the index is "automatically" added along with UNIQ_EMAIL_USER constraint?
...