MongoDB vs Redis vs Cassandra for a fast-write, temporary row storage solution

This link is a topic in stackoverflow, which is talking about comparing well-known NoSQL write operation such as MongoDB, Redis, and Cassandra.

Here: http://stackoverflow.com/questions/3010224/mongodb-vs-redis-vs-cassandra-for-a-fast-write-temporary-row-storage-solution

When Does Amazon EC2 Reserved Instance Pricing Save Money

This blog will show some calculations to find the best usage point from the instance pricing.

HBase vs Cassandra: why they moved

This link is about the company which changed from HBase to Cassandra. He is working on a brand new product. He will explain why he don't use MySQL, and use NoSQL instead. But, before his team is going to use Cassandra, which is good at scalability and fault-tolelarance, they used HBase. Therefore, in this post he will tell why he changed from HBase to Cassandra.

Here: http://ria101.wordpress.com/2010/02/24/hbase-vs-cassandra-why-we-moved/

Java vs Python on Hadoop

Normally, in term of programming languages, the scripting languages are surely slower than Java , it mainly because Java has JVM to optimize running programs, also the code will be pre-complied before execution. But, scripting languages like Python usually use interpreter to compile and execute line by line. Still, Hadoop, which is written in Java also provide the universal interface for other languages by using streaming interface. Even, Java can run faster than Python but Python can develop programs faster. Compared to other scripting languages, Python is one of the faster ones after Java.

More details at: http://stackoverflow.com/questions/1482282/java-vs-python-on-hadoop.

Difference between Pig and Hive? Why have both?

There are some arguments in stackoverflow.

Benchmark of Python WSGI Web Servers

Take a look this site, http://nichol.as/benchmark-of-python-web-servers. He tried his best to benchmark the different WSGI servers. He presented in graphs to make easy understanding.