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The way to check a HDFS directory's size?
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Prior to 0.20.203, and officially deprecated in 2.6.0:
hadoop fs -dus [directory]
Since 0.20.203 (dead link) 1.0.4 and still compatible through 2.6.0:
hdfs dfs -du [-s] [-h] URI [URI …]
You can also run hadoop fs -help for more info and...
How to get the children of the $(this) selector?
... for what it's worth: jQuery("img", this) is internally converted into: jQuery(this).find("img") So the second is ever so slightly faster. :)
– Paul Irish
Jan 8 '10 at 23:49
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How to avoid type safety warnings with Hibernate HQL results?
...ateUtils.listAndCast(q);
I'll get a compile error: Type mismatch: cannot convert from List to ArrayList
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Service vs IntentService in the Android platform
... can be done with an IntentService that cannot be done with a Service (and vice-versa)?
11 Answers
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C# version of java's synchronized keyword?
...: only apply thread-safety when you know you actually are going to use it (and test it).
For the method-level stuff, there is [MethodImpl]:
[MethodImpl(MethodImplOptions.Synchronized)]
public void SomeMethod() {/* code */}
This can also be used on accessors (properties and events):
private int ...
Send JSON data via POST (ajax) and receive json response from Controller (MVC)
...success: function (data) {
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}
});
and in action
public ActionResult AddDomain(IEnumerable<PersonSheets> SendInfo){
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you can bind your array like this
var SendInfo = [];
$(this).parents('table').find('input:checked').each(function () {
var d...
How to return PDF to browser in MVC?
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Cannot implicitly convert type 'System.Web.Mvc.FileStreamResult' to 'System.Web.Mvc.FileContentResult'
– CountMurphy
Apr 13 '15 at 16:14
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Set transparent background of an imageview on Android
...the percentage number by 100 and multiply by 255 to get the decimal value. Convert the decimal to hexadecimal here.
For example, for 50%, 50/100 * 255 = 127. Using the link we get hexadecimal value 7F.
Source: Android: how to create a transparent or opaque background
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Django template how to look up a dictionary value with a variable
...he function is in the form of a string, so perhaps use ast.literal_eval to convert the string to a dictionary first, like in this example.
With this edit, the code should look like this:
# code for custom template tag
@register.filter(name='lookup')
def lookup(value, arg):
value_dict = ast.liter...
What's the best way to do “application settings” in Android? [closed]
I'd like to store some application settings (like the URL of an API, and some settings for testing) for an Android application.
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