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搭建高可用mongodb集群（二）—— 副本集 - 大数据 & AI - 清泛网 - 专注C/...
...
rs.initiate(config);
#输出成功
{
"info" : "Config now saved locally. Should come online in about a minute.",
"ok" : 1
}
#查看日志，副本集启动成功后，138为主节点PRIMARY，136、137为副本节点SECONDARY。
Sun Dec 29 20:26:13.842 [conn3]...
Checking out Git tag leads to “detached HEAD state”
..., a commit, a date specifier, an ordinal specifier or many other things.
Now a branch is just like a tag but is movable. When you are "on" a branch and make a commit, the branch is moved to the new commit you made indicating it's current position.
Your HEAD is pointer to a branch which is consid...
How to recover stashed uncommitted changes
...oing them in the wrong branch. You just want to take the changes you have now and "move" them to another branch.
This is the easy case, described above. Run git stash save (or plain git stash, same thing). Check out the other branch and use git stash apply. This gets git to merge in your earlie...
Difference between freeze and seal
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FWIW, frozen and sealed objects are now faster than their unfrozen and unsealed counterparts in Chrome Canary v43.0.2317.0.
– llambda
Feb 28 '15 at 22:57
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Get month name from number
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import datetime
mydate = datetime.datetime.now()
mydate.strftime("%B")
Returns: December
Some more info on the Python doc website
[EDIT : great comment from @GiriB] You can also use %b which returns the short notation for month name.
mydate.strftime("%b")
For...
How to write LaTeX in IPython Notebook?
...doing, found a better solution with some more searching, IPython notebooks now have a %%latex magic that makes the whole cell Latex without the $$ wrapper for each line.
Refer notebook tour for Rich Display System
share
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Python timedelta in years
...e date. Currently I've got timedelta from datetime module and I don't know how to convert it to years.
16 Answers
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Update git commit author date when amending
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FTR, looks like on OS X, date doesn't know -R. Using date without options did the job anyway
– ksol
Feb 2 '12 at 10:29
7
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parseInt vs unary plus, when to use which?
...er for a more complete set of cases
Well, here are a few differences I know of:
An empty string "" evaluates to a 0, while parseInt evaluates it to NaN. IMO, a blank string should be a NaN.
+'' === 0; //true
isNaN(parseInt('',10)); //true
The unary + acts more like parseFloat ...
How to use android emulator for testing bluetooth application?
... adapter to 'Bridged'. ·
Start the VM and select 'Live CD VESA' at boot.
Now you need to find out the IP of this VM. Go to terminal in VM (use Alt+F1
& Alt+F7 to toggle) and use the netcfg command to find this.
Now you need open a command prompt and go to your android install
folder (on host)...