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Data Modeling with Kafka? Topics and Partitions
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@RavindranathAkila Kafka is designed to have of the order of few thousands of partitions roughly less than 10,000. And the main bottleneck is zookeeper. A better way to design such a system is to have fewer partitions and use keyed messages to distribute the data over a fixed ...
Viewing contents of a .jar file
What would be the easiest way to view classes, methods, properties, etc. inside a jar file?
I'm looking for something equivalent to the very useful Lutz Roeder .NET Reflector - for Java
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Get statistics for each group (such as count, mean, etc) using pandas GroupBy?
I have a data frame df and I use several columns from it to groupby :
7 Answers
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Difference between attr_accessor and attr_accessible
...ment: new(attrs) or update_attributes(attrs).
Here's a mass assignment:
Order.new({ :type => 'Corn', :quantity => 6 })
You can imagine that the order might also have a discount code, say :price_off. If you don't tag :price_off as attr_accessible you stop malicious code from being able to ...
How to organize a node app that uses sequelize?
...y important (like the name of the foreign key, if it's allowed to be null, etc.)
– Andrey Popov
Mar 12 '15 at 14:58
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Choosing between std::map and std::unordered_map [duplicate]
Now that std has a real hash map in unordered_map , why (or when) would I still want to use the good old map over unordered_map on systems where it actually exists? Are there any obvious situations that I cannot immediately see?
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When to use Hadoop, HBase, Hive and Pig?
...k. HBase has nothing to do with it. That said, you can efficiently put or fetch data to/from HBase by writing MapReduce jobs. Alternatively you can write sequential programs using other HBase APIs, such as Java, to put or fetch the data. But we use Hadoop, HBase etc to deal with gigantic amounts of ...
What is Java Servlet?
...les the networking side (e.g. parsing an HTTP request, connection handling etc). One of the best-known open source servlet containers is Tomcat.
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ALTER TABLE without locking the table?
...ferably in a transaction.
Once finished, recompile any stored procedures, etc that use that table. The execution plans will likely no longer be valid.
EDIT:
Some comments have been made about this limitation being a bit poor. So I thought I'd put a new perspective on it to show why it's how it ...
How to color System.out.println output? [duplicate]
...RL+V,CTRL+[[31mERROR MESSAGE IN RED'
ie, press CTRL+V and then CTRL+[ in order to get a "raw" ESC character when escape interpretation is not available
If done correctly, you should see a ^[. Although it looks like two characters, it is really just one, the ESC character.
You can also press CTRL+V...