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Data Modeling with Kafka? Topics and Partitions
...whelming Zookeeper, it is better to partition by user id, and have user id based consumers subscribe to each partition if?
– Ravindranath Akila
Sep 19 '13 at 19:41
2
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With MySQL, how can I generate a column containing the record index in a table?
... year( d1.date ), month( d1.date ), count( d1.id )
from maindatabase d1
where ( ( d1.date >= '2013-01-01' ) and ( d1.date <= '2014-12-31' ) )
group by YEAR( d1.date ), MONTH( d1.date ) ) d3
s...
What is the difference between ELF files and bin files?
...u can take this data and load it directly as is, you need to know what the base address is though as that is normally not in there.
An elf file contains the bin information but it is surrounded by lots of other information, possible debug info, symbols, can distinguish code from data within the bin...
Microsoft Roslyn vs. CodeDom
...
It would be great if someone had already created a Roslyn-based tool to convert code that uses CodeDom into code that uses Roslyn's SyntaxFactory... (Partly because .Net Core has Roslyn but no CodeDom and I'm using a lib built around CodeDom)
– Emyr
...
How can I find all of the distinct file extensions in a folder hierarchy?
...folder):
for f in *.*; do printf "%s\n" "${f##*.}"; done | sort -u
I've based this upon this forum post, credit should go there.
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Scheduling recurring task in Android
...o wake up the CPU to run your code.
You should use one of those solutions based on your timing and worker thread needs.
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Why does C++ require a user-provided default constructor to default-construct a const object?
...of T would invoke a user-provided constructor
of T (not inherited from a base class) or if
each direct non-variant non-static data member M of T has a default member initializer or, if M is of class type X (or array thereof), X
is const-default-constructible,
if T is a union with at le...
Rails 4 multiple image or file upload using carrierwave
...avatar:string
rake db:migrate
In post.rb
class Post < ActiveRecord::Base
has_many :post_attachments
accepts_nested_attributes_for :post_attachments
end
In post_attachment.rb
class PostAttachment < ActiveRecord::Base
mount_uploader :avatar, AvatarUploader
belongs_to :post
end...
Can you create nested WITH clauses for Common Table Expressions?
...s a recursive query:
WITH y
AS
(
SELECT x, y, z
FROM MyTable
WHERE [base_condition]
UNION ALL
SELECT x, y, z
FROM MyTable M
INNER JOIN y ON M.[some_other_condition] = y.[some_other_condition]
)
SELECT *
FROM y
You may not need this functionality. I've done the following just to o...
Removing duplicate objects with Underscore for Javascript
...
If you're looking to remove duplicates based on an id you could do something like this:
var res = [
{id: 1, content: 'heeey'},
{id: 2, content: 'woah'},
{id: 1, content:'foo'},
{id: 1, content: 'heeey'},
];
var uniques = _.map(_.groupBy(res,function(doc)...