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How to think in data stores instead of databases?

... The datastore makes no distinction between inserts and updates. When you call put() on an entity, that entity gets stored to the datastore with its unique key, and anything that has that key gets overwritten. Basically, each entity kind in the datastore acts like an enormous map or sorted list. Que...
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Name node is in safe mode. Not able to leave

...e leave hadoop dfsadmin has been deprecated and so is hadoop fs command, all hdfs related tasks are being moved to a separate command hdfs. share | improve this answer | f...
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Test PHP headers with PHPUnit

...78 Error: Class 'PHPUnit_Util_Configuration' not found in - on line 378 Call Stack: 0.0013 582512 1. {main}() -:0 Try add this to your bootstrap file to fix it: <?php if (!defined('PHPUNIT_COMPOSER_INSTALL')) { define('PHPUNIT_COMPOSER_INSTALL', __DIR__ . '/path/to/composer/ven...
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Can I have onScrollListener for a ScrollView?

... Every instance of View calls getViewTreeObserver(). Now when holding an instance of ViewTreeObserver, you can add an OnScrollChangedListener() to it using the method addOnScrollChangedListener(). You can see more information about this class here. ...
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How to list all tags along with the full message in git?

I want git to list all tags along with the full annotation or commit message. Something like this is close: 8 Answers ...
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How to get GET (query string) variables in Express.js on Node.js?

...eJS, you can access req.url and the builtin url module to url.parse it manually: var url = require('url'); var url_parts = url.parse(request.url, true); var query = url_parts.query; share | improve...
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How can I generate a unique ID in Python? [duplicate]

...in newer versions, but most people probably don't have that yet, so I generally avoid this module. Caused me major headaches with listen sockets... – Glenn Maynard Jul 31 '09 at 3:14 ...
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Efficiently convert rows to columns in sql server

...d than just a single script but gives you much more flexibility. First of all There are 3 objects: User defined TABLE type [ColumnActionList] -> holds data as parameter SP [proc_PivotPrepare] -> prepares our data SP [proc_PivotExecute] -> execute the script CREATE TYPE [dbo].[ColumnAc...
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Where does gcc look for C and C++ header files?

...stem header. If you run gcc in verbose mode on such a source, it will list all the system include locations as it looks for the bogus header. $ echo "#include <bogus.h>" > t.c; gcc -v t.c; rm t.c [..] #include "..." search starts here: #include <...> search starts here: /usr/local...
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TypeError: 'module' object is not callable

...> This is what the error message means: It says module object is not callable, because your code is calling a module object. A module object is the type of thing you get when you import a module. What you were trying to do is to call a class object within the module object that happens to have ...