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分布式系统的事务处理 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...虑下面的这么几个情况：
1）容灾：数据不丢、结点的Failover
2）数据的一致性：事务处理
3）性能：吞吐量 、 响应时间
前面说过，要解决数据不丢，只能通过数据冗余的方法，就算是数据分区，每个区也需要进行数据冗余处...
How to launch an Activity from another Application in Android
...
If you don't know the main activity, then the package name can be used to launch the application.
Intent launchIntent = getPackageManager().getLaunchIntentForPackage("com.package.address");
if (launchIntent != null) {
startActivity(launchInte...
Why should I avoid multiple inheritance in C++?
...ly, it was done for bad reasons, and it will blow back in the face of the maintainer.
Summary
Consider composition of features, instead of inheritance
Be wary of the Diamond of Dread
Consider inheritance of multiple interfaces instead of objects
Sometimes, Multiple Inheritance is the right thing. I...
Setting individual axis limits with facet_wrap and scales = “free” in ggplot2
...= value)) +
facet_wrap(~variable, scales = "free") +
geom_point(size = 2.5) +
geom_blank(data=dummy) +
theme_bw()
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携程获得Priceline等10亿美元投资 - 资讯 - 清泛网 - 专注C/C++及内核技术
...%的股票，此持股比例包含携程对Priceline于2015年5月发行的2.5亿美元可转换债券以及2014年8月发行的5亿美元可转换债券。
Priceline集团于2012年和携程开始商业合作，于2014年8月深化合作，并在2015年5月进一步加强了双方的战略合作...
How to get row from R data.frame
... B = c(4.25, 4, 4, 4.5, 4.5 ),
C = c(4.5, 2.5, 4, 2.25, 3 )
),
.Names = c("A", "B", "C"),
class = "data.frame",
row.names = c(NA, -5L)
)
#The vector your result should match
y<-c(A=5, B...
YouTube API to fetch all videos on a channel
...p;maxResults=20
After that you will receive a JSON with video ids and details, and you can construct your video URL like this:
http://www.youtube.com/watch?v={video_id_here}
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How can I add the sqlite3 module to Python?
...stall sqlite3 module. It is included in the standard library (since Python 2.5).
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git command to show all (lightweight) tags creation dates
... fits my needs:
git log --tags --simplify-by-decoration --pretty="format:%ai %d"
I've put that command in an alias in my ~/.alias, so now everytime I run gitshowtagbydate I get what I needed.
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Python - When to use file vs open
...en file and open in Python? When should I use which one? (Say I'm in 2.5)
6 Answers
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