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what's the difference between “hadoop fs” shell commands and “hdfs dfs” shell commands?
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From what I can tell, there is no difference between hdfs dfs and hadoop fs. They're simply different naming conventions based on which version of Hadoop you're using. For example, the notes in 1.2.1 use hdfs dfs while 0.19 u...
Jackson how to transform JsonNode to ArrayNode without casting?
I am changing my JSON library from org.json to Jackson and I want to migrate the following code:
4 Answers
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Rails update_attributes without save?
...Your example is a little bit misleading since you haven't pasted this line from the model: attr_accessible :is_admin, :as => :admin ;)
– Robin
Sep 5 '12 at 16:12
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Reading binary file and looping over each byte
...ersions of Python below 2.5. To use it in v 2.5 you'll need to import it:
from __future__ import with_statement
In 2.6 this is not needed.
Python 3
In Python 3, it's a bit different. We will no longer get raw characters from the stream in byte mode but byte objects, thus we need to alter the co...
How to Import .bson file format on mongodb
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Maybe you can add that these commands are to be run from command prompt and not from mongo console. That would help new users
– Dreams
Sep 11 '17 at 8:33
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Uint8Array to string in Javascript
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TextEncoder and TextDecoder from the Encoding standard, which is polyfilled by the stringencoding library, converts between strings and ArrayBuffers:
var uint8array = new TextEncoder("utf-8").encode("¢");
var string = new TextDecoder("utf-8").decode(u...
Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_
...s of data. I encountered a very weird effect: Changing the loop variable from unsigned to uint64_t made the performance drop by 50% on my PC.
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Difference between exit(0) and exit(1) in Python
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Because of exit codes from Unix/Linux, I was thinking 0 is True and 1 is False value in the Python conditions.
– vlyalcin
Apr 8 at 15:36
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What does the @ symbol represent in objective-c?
...jects more efficient. (They become part of the method signature available from the runtime, which DO can look at to determine how to best serialize a transaction.) There are also the attributes within @property declarations, copy, retain, assign, readonly, readwrite, nonatomic, getter, and setter;...
Easy way to write contents of a Java InputStream to an OutputStream
...eption
As the documentation states, transferTo will:
Reads all bytes from this input stream and writes the bytes to the
given output stream in the order that they are read. On return, this
input stream will be at end of stream. This method does not close
either stream.
This method ...