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Simple explanation of MapReduce?
...e reduced to a scalar value.
So if you think of it like a SQL statement
SELECT SUM(salary)
FROM employees
WHERE salary > 1000
GROUP by deptname
We can use map to get our subset of employees with salary > 1000
which map emits to the barrier into group size buckets.
Reduce will sum each of...
How to convert Linux cron jobs to “the Amazon way”?
...memcached or some database
Then using multiple Gearman servers you have to select one that creates task via cronjob, so again we are back to the same problem. But if you can live with this kind of single point of failure using Gearman looks like quite good solution. Especially that you don't need bi...
What is the difference between 'git pull' and 'git fetch'?
...irdly worded. git pull will always merge into the current branch. So you select which branch you want to pull from, and it pulls it into the current branch. The from branch can be local or remote; it can even be a remote branch that's not a registered git remote (meaning you pass a URL on the git...
No appenders could be found for logger(log4j)?
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In IntelliJ idea open module setting and select your resource folder and click resources, it will automatically add your every resource to the classpath.
– Waqas
Aug 12 '16 at 7:04
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Linking static libraries to other static libraries
...tiple libraries.
Edit: In response to your update, the only way I know to select only the symbols that are required is to manually create the library from the subset of the .o files that contain them. This is difficult, time consuming and error prone. I'm not aware of any tools to help do this (not...
How do I Sort a Multidimensional Array in PHP [duplicate]
...'s associative if you want: this code takes care of sorting items, but you select the actual sort function (usort or uasort).
Finally, it does not use array_multisort: while array_multisort is convenient, it depends on creating a projection of all your input data before sorting. This consumes time a...
How to deal with persistent storage (e.g. databases) in Docker
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In case it is not clear from update 5 of the selected answer, as of Docker 1.9, you can create volumes that can exist without being associated with a specific container, thus making the "data-only container" pattern obsolete.
See Data-only containers obsolete with dock...
Add a prefix string to beginning of each line
...
You can use Vim in Ex mode:
ex -sc '%s/^/prefix/|x' file
% select all lines
s replace
x save and close
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How to create a library project in Android Studio and an application project that uses the library p
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To create a library:
File > New Module
select Android Library
To use the library add it as a dependancy:
File > Project Structure > Modules > Dependencies
Then add the module (android library) as a module dependency.
Run your project. It will wo...
Implementing two interfaces in a class with same method. Which interface method is overridden?
...e is only one method to implement, and thus there's nothing to distinguish/select from.
The compiler does not have to identify which method is for which interface, because once they are determined to be @Override-equivalent, they're the same method.
Resolving potential incompatibilities may be a ...