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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
...以自动投票，选举出新的Master，并引导其余的Slave服务器连接新的Master，
而这个过程对于应用是透明的。可以说MongoDB的副本集是自带故障转移功能的主从复制。
1 相对于传统主从模式的优势
传统的主从模式，需要手工指定...
Undocumented NSURLErrorDomain error codes (-1001, -1003 and -1004) using StoreKit
... 4 minutes?
Is there a possibility that your device is switching networks (WiFi, 3G, VPN)?
Could someone (client vs. server) be waiting for authentication?
Sorry, no ideas how to fix. Just debugging this, trying to find out what the problem is (-1021, -1001, -1009)
Update: Google search was very ...
Android Writing Logs to text File
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@DDSports you can use adb over wifi.
– Daniel F
Feb 3 '16 at 16:01
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廉价共享存储解决方案1-drbd+ha+nfs - 更多技术 - 清泛网 - 专注C/C++及内核技术
...cted Secondary/Secondary Inconsistent/Inconsistent C
cs：表示连接状态
ro: 表示主从关系 上面的表示都为从
ds：硬盘状态信息 上面表示已经实时同步中，Inconsistent：不一致
# cat /proc/drbd
version: 8.4.6 (api:1/proto:86-101)
GIT-hash: 83...
Configure Flask dev server to be visible across the network
... @nwillo do mobile and the machine on which I serve be connected to same wifi/network.
– sachin rathod
Mar 27 at 14:38
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How can I redirect HTTP requests made from an iPad?
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I found you just have to modify the Wifi settings in your iPad to use the IP address of your development machine as an HTTP proxy (as explained in the aforementioned article):
That way, it's enough to be able to access your web application on your iPad by en...
搭建高可用mongodb集群（三）—— 深入副本集内部机制 - 大数据 & AI - 清...
...以触发。
初始化一个副本集时。
副本集和主节点断开连接，可能是网络问题。
主节点挂掉。
选举还有个前提条件，参与选举的节点数量必须大于副本集总节点数量的一半，如果已经小于一半了所有节点保持只读状态。
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How is location accuracy measured in Android?
... for an example 1000 meters. By this time Android will also try to see all WiFi networks in the area an will send information about them too to the Google server and if possible Google server will return a new location with higher accuracy for an example 800 meters.
By this time the GPS will be on....
How to detect online/offline event cross-browser?
...t does not work in Firefox/Chrome if you unplug the ethernet cable or turn wifi off.
– Manish
Feb 21 '14 at 12:05
I tr...
编译器内部的秘密--微软的编译器是如何解析Try/Catch/Throw的 - C/C++ - 清...
...mbler)和调试程序(debugger)。
可以使用release模式进行编译连接，但是要把所有的代码优化选项关闭掉。这样你就不用再程序的开头看到那么多注册信息，在程序最后看到那么多函数调用，而且代码也不会被优化器给重新排列，你...