From the beginning of the Hadoop’s history, MapReduce has been the complete game changer in town when it comes to deal with data processing.
Commercially available distributions of Hadoop offer different combinations of open source components from the Apache Software Foundation and from several other places
A number of companies offer tools designed to help you get the most out of your Hadoop implementation. Here’s a sampling:
First of all, let’s just clarify about what do we meant by saying “key-value” pairs by understanding similar concepts in the Java standard API.
There are several other open source components that are typically seen in a Hadoop deployment.