What is the purpose of button groups?

Button groups are used for the placement of more than one buttons in the same line.

It seems like there might be a confusion in your question. Hadoop is a framework for distributed storage and processing of large data sets, typically used for big data applications. Button groups, on the other hand, are usually associated with user interfaces in web development or graphical user interfaces (GUIs), not directly related to Hadoop.

If you have a specific question about Hadoop or button groups in a different context, please provide more details, and I’ll do my best to assist you.