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Apache Spark: map vs mapPartitions?
...case of mappartitions).
map
Applies a transformation function on each item of the RDD and returns
the result as a new RDD.
Listing Variants
def map[U: ClassTag](f: T => U): RDD[U]
Example :
val a = sc.parallelize(List("dog", "salmon", "salmon", "rat", "elephant"), 3)
val b = ...
What is the difference between UTF-8 and Unicode?
...lt to UTF-8 these days. Communications protocols such as HTTP tend to work best with UTF-8, as the unit size in UTF-8 is the same as in ASCII, and most such protocols were designed in the ASCII era. On the other hand, UTF-16 gives the best average space/processing performance when representing all l...
Is there a method that calculates a factorial in Java?
...y is not without costs. As others have pointed out, there is not a single best solution. Which one do you propose building into the language? Having a method in the standard library isn't going to save you the time of understanding your problem, and once you've done that you might as well select ...
Opening Vim help in a vertical split window
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@AaronShen: best solution ( in combo with this answer )!
– gauteh
Jan 9 '18 at 10:03
add a comment
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Can a java file have more than one class?
... to search for the file with that name.
The exception is when a class is best implemented using one or more small helper classes. Usually, the code is easiest to follow when those classes are present in the same file. For instance, you might need a small 'tuple' wrapper class to pass some data bet...
How to retrieve absolute path given relative
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then see links in comment to your question, best way probably is 'readlink -f $line'
– mpapis
Nov 13 '10 at 23:45
3
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JavaScript inheritance: Object.create vs new
...y libraries / frameworks. I think this example (in my fiddle above) is the best approach for modern browsers. Perhaps the Object.Create polyfill could add support for legacy browsers?
– ChrisRich
Oct 29 '12 at 1:35
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Is Fortran easier to optimize than C for heavy calculations?
...eant restricting features and capability in order to give the compiler the best shot at optimizing the code. A good analogy is to think of Fortran 77 as a professional race car that sacrifices features for speed. These days compilers have gotten better across all languages and features for programme...
Why does Html.ActionLink render “?Length=4”
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@roryf no worries ... this was used in a code review as a best practices, they didn't check the date. There really should be a way to filter the stackoverflow by date ...
– THBBFT
May 13 '13 at 15:32
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How can I color Python logging output?
...n't want to have the colors in the log files. To avoid that, it's probably best to simply create a copy of record with copy.copy() before manipulating the levelname attribute, or to reset the levelname to the previous value, before returning the formatted string (credit to Michael in the comments).
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