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What is Pig?

1. Pig is an open source high level dataflow system

Why is it important?

1. Some form of ad-hoc processing and analysis of all of this information is required.
2. Higher level procedural data flow language
3. Similar to SQL query where the user specifies the what and leaves the "how" to the underlying processing engine

Pig Characteristics

1. A platform for analyzing large data sets that runs on top Hadoop
2. Provides a high level language for expressing data analysis
3. Uses both HDFS (read and write files) and MapReduce.

Pig Elements:

Pig Latin: 

1. High level scripting language
2. Designed specifically for data transformation and flow expression

Grunt:

1. The environment in which Pig Latin commands are executed
2. Currently there is support for local and Hadoop modes.

Pig Interpreter:

1. Pig interpreter converts Pig Latin to MapReduce

Running PIG

Script:

1. Execute commands in a file
2. $pig script_file.pig

Grunt:

1. Interactive shell for executing Pig commands
2. Started when script file is NOT provided

Pig Data type:

Hadoop Pig architecture

Difference between hapdoop mapreduce, pig and hive :