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Explaining Apache ZooKeeper
...e-light, meaning that mechanisms such as leader election, locks, barriers, etc. are not already present, but can be written above the ZooKeeper primitives.
If the C/Java API is too unwieldy for your purposes, you should rely on libraries built on ZooKeeper such as cages and especially curator.
Whe...
What exactly do the Vagrant commands do?
...more complete list:
box manages boxes: installation, removal, etc.
connect connect to a remotely shared Vagrant environment
destroy stops and deletes all traces of the vagrant machine
docker-logs outputs the logs from the Docker container
docker-run run a one-of...
Turn off constraints temporarily (MS SQL)
...umns like so:
UPDATE myUpdatedTable SET someCol = someCol, fkCol = fkCol, etc = etc
And any errors at that point will be due to failure to meet constraints.
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iOS Tests/Specs TDD/BDD and Integration & Acceptance Testing
...er if the specified item can't be shipped by the selected shipping method; etc. As these possible conditions intersect with one another you end up with a geometrically increasing number of possible contexts; in xUnit-style testing this often leads to a lot of methods with names like testAddItemWhen...
Where does the “flatmap that s***” idiomatic expression in Scala come from?
...operation shared by, for example, containers (such as Option, collections, etc), continuations, state, etc. Second, while you can de-construct an Option, that, as opposed to flatMap, is not a monadic operation, so it cannot be as widely applied. Also, it requires too much knowledge about the data yo...
How do I check for a network connection?
... continue;
// this allow to filter modems, serial, etc.
// I use 10000000 as a minimum speed for most cases
if (ni.Speed < minimumSpeed)
continue;
// discard virtual cards (virtual box, virtual pc, etc.)
if (...
Android Log.v(), Log.d(), Log.i(), Log.w(), Log.e() - When to use each one?
...ine what is considered a debug log versus informational, versus and error, etc. etc.
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Are global variables in PHP considered bad practice? If so, why?
...e to access values that you need, for example get_query_var() in Wordpress etc.
– user2098467
Oct 23 '15 at 2:29
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Why do we need the “event” keyword while defining events?
...yone can remove other people's event handlers, raise the event themselves, etc - it's an encapsulation disaster.
For more on events (and delegates) read my article on this topic. (At some point I need to update this for C# 4, which changes field-like events very slightly. The gist of it is still co...
Python assigning multiple variables to same value? list behavior
...
If you're coming to Python from a language in the C/Java/etc. family, it may help you to stop thinking about a as a "variable", and start thinking of it as a "name".
a, b, and c aren't different variables with equal values; they're different names for the same identical value. Var...