Pig is a dataflow programming environment for processing very large files. Pig's language is called Pig Latin. A Pig Latin program consists of a directed acyclic graph where each node represents an operation that transforms data. Operations are of two flavors: (1) relational-algebra style operations such as join, filter, project; (2) functional-programming style operators such as map, reduce.
Pig compiles these dataflow programs into (sequences of) map-reduce or Apache Tez jobs and executes them using Hadoop. It is also possible to execute Pig Latin programs in a "local" mode (without Hadoop cluster), in which case all processing takes place in a single local JVM.
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