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  [http://incubator.apache.org/pig/ 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 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.
+ 
+ <a href="http://www.cs.cmu.edu/~olston/publications/sigmod08.pdf";>Why Pig 
Latin instead of SQL?</a>
  
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