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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
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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机制会记录本机的操作,方便和主服务器进行对比数据是否同步还可以用于错误恢复。
? 如果集群中大部分服务器down机了,保留活着的节...
How to open the default webbrowser using java
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is this a cross-platform solution or Windows only? other answers in this thread suggest to use the Runtime class for Linux
– isapir
Oct 23 '13 at 4:05
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Access data in package subdirectory
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You can use __file__ to get the path to the package, like this:
import os
this_dir, this_filename = os.path.split(__file__)
DATA_PATH = os.path.join(this_dir, "data", "data.txt")
print open(DATA_PATH).read()
share
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Using Caps Lock as Esc in Mac OS X
How do I make Caps Lock work like Esc in Mac OS X?
14 Answers
14
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What is the full path to the Packages folder for Sublime text 2 on Mac OS Lion
...the user's library directory is now hidden by default in newer versions of OSX. Run chflags nohidden ~/Library in the terminal to reveal them.
– DA.
Jul 4 '13 at 16:51
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Is there an equivalent of lsusb for OS X
...device's configuration descriptors. Without that, I'm afraid this tool is mostly just a pretty-printer.
– Ted Middleton
May 17 '16 at 19:17
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Setting the MySQL root user password on OS X
I just installed MySQL on Mac OS X. The next step was setting the root user password, so I did this next:
23 Answers
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进程间通信(IPC)的几种方式 - C/C++ - 清泛网 - 专注C/C++及内核技术
...言是不能互相访问的,唯一的例外是共享内存区。但是,系统空间却是“公共场所”,所以内核显然可以提供这样的条件。除此以外,那就是双方都可以访问的外设了。在这个意义上,两个进程当然也可以通过磁盘上的普通文件...
C++虚析构函数解析 - C/C++ - 清泛网 - 专注C/C++及内核技术
...什么基类的析构函数是虚函数?在实现多态时,当用基类操作派生类,在析构时防止只析构基类而不析构派生类的状况发生。以下内容转自:http...为什么基类的析构函数是虚函数?
在实现多态时,当用基类操作派生类,在析构...
程序崩溃时malloc/new可能导致死锁,程序卡死退不出 - C/C++ - 清泛网 - 专...
...死锁概率低一些,死锁感觉是由于malloc不可重入导致的。操作系统底层API行为可能不一致,可能有办法指定 1、程序崩溃时malloc/new可能导致死锁,程序卡死退不出。Win、Linux下都会发生,应该是malloc系统函数的不可重入性导致...