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What is the difference between partitioning and bucketing a table in Hive ?
...Other drawback is having too many partitions is the large number of Hadoop files and directories that are created unnecessarily and overhead to NameNode since it must keep all metadata for the file system in memory.
Bucketing is another technique for decomposing data sets into more manageable parts....
C++ performance vs. Java/C#
...: C++ allocation can't be moved in memory, true, but then, like on a Linux filesystem: Who needs hard disk defragmenting when fragmentation does not happen? Using the right allocator for the right task should be part of the C++ developer toolkit. Now, writing allocators is not easy, and then, most o...
Bootstrap table without stripe / borders
... just add the css style in the line with style=, or put it in a customized file and ensure that it is loaded later than Bootstrap css file, to override the Bootstrap default style. CSS are loaded with order; the latter overwrites the former, the more specific overwrites the more general ones.
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ALTER TABLE without locking the table?
...alues that existed in that column before was dropped are still in the data files (and visible to other transactions), and will remain so unless and until you do a VACUUM FULL.
– Noah Yetter
Aug 16 '16 at 21:02
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What resources are shared between threads?
...xt and data, as well as other resources. These
resource may include open files, child processes, pending alarms,
signal handlers, accounting information, and more. By putting them
together in the form of a process, they can be managed more easily.
The other concept a process has is a thread ...
Sanitizing strings to make them URL and filename safe?
...they are safe to use in the URL (like a post slug) and also safe to use as file names. For example, when someone uploads a file I want to make sure that I remove all dangerous characters from the name.
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Using Custom Domains With IIS Express
....)
Optionally: Set the Start URL to http://dev.example.com
Open %USERPROFILE%\My Documents\IISExpress\config\applicationhost.config (Windows XP, Vista, and 7) and edit the site definition in the <sites> config block to be along the lines of the following:
<site name="DevExample" id="9970...
How does autowiring work in Spring?
...e the userService variable with UserService type. So why make entry in xml file.
– viper
May 24 '16 at 10:05
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What Ruby IDE do you prefer? [closed]
...-closing, symbol lists, code navigation, directory tree, multi-tabbed open files etc.) but also normal IDE features such as simple project management, compile-build-run within the main window. Unlike TextMate, it has a Terminal screen within its own window; you do not have to go back and force betwe...
Coarse-grained vs fine-grained
...on mechanisms like sockets, signal handlers, shared memory, semaphores and files. Threads, on the other hand, have access to shared memory space that belongs to a process, which allows them to apply finer grain communication mechanisms.
Source: Java concurrency in practice
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