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Spark java.lang.OutOfMemoryError: Java heap space
...optimal partition value I have 1 TB skewed data to process and it involves group by hive queries. Please guide.
– unk1102
Sep 2 '15 at 7:15
2
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Algorithm to generate all possible permutations of a list?
...tations of the list of size n, we get n! / n = (n-1)! permutations in each group.
The list of 2 elements has only 2 permutations => [a,b] and [b,a].
Using these two simple ideas I have derived the following algorithm:
permute array
if array is of size 2
return first and second elem...
How to make junior programmers write tests? [closed]
...ll worth the resources you commit to it.
Maybe also have someone in your group give the Unit Testing 101 presentation by Kate Rhodes, I think its a great way to get people excited about testing, if delivered well.
Another thing you can do is have your Jr. Devs practice the Bowling Game Kata which...
Is element block level or inline level?
...ies to: all elements but non-replaced inline elements, table rows, and row groups "
Since an image is a replaced inline element, it does apply.
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Calculate a Running Total in SQL Server
...al) AS RunningTotal
FROM #t a CROSS JOIN #t b
WHERE (b.ord <= a.ord)
GROUP BY a.ord,a.total
ORDER BY a.ord
-- CPU 16053, Reads 154935, Duration 4647
Test 3:
DECLARE @TotalTable table(ord int primary key, total int, running_total int)
DECLARE forward_cursor CURSOR FAST_FORWARD
FOR
SELEC...
Factory Pattern. When to use factory methods?
... object shouldn't depend on how its inner objects are created and designed
Group of linked objects should be used together and you need to serve this constraint
Object should be configured by one of several possible families of linked objects that will be a part of your parent object
It is required ...
What is the purpose of a self executing function in javascript?
... scope), is an abstract container or environment created to hold a logical grouping of unique identifiers or symbols (i.e., names). and A namespace identifier may provide context (Scope in computer science) to a name, and the terms are sometimes used interchangeably.
– Christop...
Should developers have administrator permissions on their PC
...y do know when they're using the sudo, but they may need one with the same group permissions), and can do incredible amounts of damage to the OS very easily, so the same IT policy is necessary.
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Building a minimal plugin architecture in Python
...int/a set of functionalities that will always be overridden, and determine groups within these actions. Once this is done, it should be easy to extend your application,
Example using hooks, inspired from MediaWiki (PHP, but does language really matters?):
import hooks
# In your core code, on key ...
What's the difference between JPA and Hibernate? [closed]
...entation defining its own mapping definition or client API. The JPA expert group gathered the best of all these tools and so they created the Java Persistence API standard.
A standard persistence API is very convenient from a client point of view, making it relatively easy to switch one implementat...