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Apache Spark: The number of cores vs. the number of executors
...’ve noticed that the HDFS client has trouble with tons of concurrent
threads. A rough guess is that at most five tasks per executor can
achieve full write throughput, so it’s good to keep the number of
cores per executor below that number.
So I believe that your first configuration is sl...
What does the M stand for in C# Decimal literal notation?
...sion, not the MS version):
The decimal suffix is M/m since D/d
was already taken by double.
Although it has been suggested that M
stands for money, Peter Golde recalls
that M was chosen simply as the next
best letter in decimal.
A similar annotation mentions that early versions of C#...
Android SharedPreference security
...rprefs
As said by others anyone can access it but in this case no one can read data inside it as it is encrypted. So its secure.For Utmost security my suggestion will be to generate the key used for encryption at run time rather than hard coding it. There are many ways to do that :)
...
How to replace plain URLs with links?
... a bug in the code that matches email addresses here. [a-zA-Z]{2,6} should read something along the lines of (?:[a-zA-Z]{2,6})+ in order to match more complicated domain names, i.e. email@example.co.uk.
– Roshambo
Aug 19 '11 at 15:07
...
What's the Hi/Lo algorithm?
... Other systems, like a DBA trying to run an INSERT statement. If she reads the current sequence data, do you think it's easy to figure out the next identifier value knowing we use hilo in this particular DB table?
– Vlad Mihalcea
Feb 7 '17 at 1:46
...
How does the SQL injection from the “Bobby Tables” XKCD comic work?
...ke more sense. It would also explain why the database connection isn't in read-only mode.
– dan04
Aug 10 '10 at 4:02
3
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What is the difference between a heuristic and an algorithm?
...thods.
In more precise terms, heuristics
stand for strategies using readily
accessible, though loosely applicable,
information to control problem solving
in human beings and machines.
While an algorithm is a method containing finite set of instructions used to solving a problem. The m...
Chrome Dev Tools - “Size” vs “Content”
...ze = Transfer size and Content = Actual size
This is my formula based on reading various articles on this topic (and I am open to improve it further with your comments)
Size = Compression(Content) + Response Header
See the image used in this article
Explanation by Google
...
How to save a git commit message from windows cmd?
...t, more Linux friendly:
git config --global core.editor "gedit"
You can read the current configuration like this:
git config core.editor
share
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How to use PHP OPCache?
...es the php files in compiled form in memory. So you don't have overhead of reading from disk and compiling & optimizing of files by the php parser anymore. Memcache is something you can use to store variables in between sessions. Sayt for example a user has an update script that requests the sam...