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what's the difference between “hadoop fs” shell commands and “hdfs dfs” shell commands?
...others
hadoop dfs <args>
dfs is very specific to HDFS. would work for operation relates to HDFS. This has been deprecated and we should use hdfs dfs instead.
hdfs dfs <args>
same as 2nd i.e would work for all the operations related to HDFS and is the recommended command ins...
Closing WebSocket correctly (HTML5, Javascript)
... the connection gracefully? Like, what happens if user refreshes the page, or just closes the browser?
5 Answers
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Make a negative number positive
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Just call Math.abs. For example:
int x = Math.abs(-5);
Which will set x to 5.
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Prevent direct access to a php include file
... have a php file which I will be using as exclusively as an include. Therefore I would like to throw an error instead of executing it when it's accessed directly by typing in the URL instead of being included.
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Benchmarking (python vs. c++ using BLAS) and (numpy)
...extensive use of BLAS and LAPACK linear algebra functionalities. Since performance is an issue I did some benchmarking and would like know, if the approach I took is legitimate.
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What's valid and what's not in a URI query?
I've been Googling this back and forth reading RFCs and SO questions trying to crack this, but I still don't got jack.
7 An...
What's the difference between F5 refresh and Shift+F5 in Google Chrome browser?
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It ignores the cached content when refreshing...
https://support.google.com/a/answer/3001912?hl=en
F5 or Control + R = Reload the current page
Control+Shift+R or Shift + F5 = Reload your current page, ignoring cached content...
What are the best practices for using a GUID as a primary key, specifically regarding performance?
...y Key in almost all tables and I have read that there are issues about performance when using GUID as Primary Key. Honestly, I haven't seen any problem, but I'm about to start a new application and I still want to use the GUIDs as the Primary Keys, but I was thinking of using a Composite Primary Key...
How to check whether an object is a date?
...ia
typeof date.getMonth === 'function'
you can use the instanceof operator, i.e. But it will return true for invalid dates too, e.g. new Date('random_string') is also instance of Date
date instanceof Date
This will fail if objects are passed across frame boundaries.
A work-around for this is ...
Running a Python script from PHP
...e output as a string.
It returns the output from the executed command or NULL if an error
occurred or the command produces no output.
<?php
$command = escapeshellcmd('/usr/custom/test.py');
$output = shell_exec($command);
echo $output;
?>
In Python file test.py, verify this text ...