What is Pig in Hadoop?

Описание: Big Data Explained: What Is Pig?
Pig basically simplifies the processes needed to get analytics done through Hadoop on your big data sets.
Like the animal, Pig is not a fussy eater, getting its name from its ability to crunch through data, no matter what form it takes. It acts as a scripting interface to Hadoop, meaning a lack of MapReduce programming experience won't hold you back.

Example: Harvey works in a government office, looking to formulate new solutions for his city's parking problems. He knows how to use data, but writing his own mapper and reduce functions is a little beyond him.

Luckily, he's been set up with access to the databases through Pig, meaning he can draw on sources like parking ticket records and population density maps. Taking advantage of Pig's eat-anything attitude, he can also mine topics from a call for email suggestions his department sent to local residents, as well as sensor information about the amount of traffic on the roads. In spite of his limited programming capabilities, Pig allows Harvey to query these data sets and sketch out some draft suggestions he can use to alleviate the local parking problems.