Execution modes available in PIG?

[DataFlair Team]

What are the different modes of Pig Execution?
Explain Apache Pig Execution?

[DataFlair Team]

In terms of starting Pig, it can be started in 2 modes –

• Local Mode
• MapReduceMode.

In Local Mode:
1) Files are referenced from the Local File System.
2) No need of Hadoop or HDFS .
3) Used mainly for Testing and Debugging purposes.
4) It is started by:pig -x local

In MapReduce Mode:
1) Files are referenced from HDFS (in localhost or remote cluster)
2) Each PigLatin statement is broken down into a series of MapReduce jobs in the background.
3) Used for Production run.
4) It is started by:pig -x mapreduceor simplypig

In terms of Executing Pig Scripts, they can be executed in 2 modes –

• Interactive Mode
• Batch Mode.

In Interactive Mode a user can start Grunt Shell by executing the commandpigorpig -x localand can run Pig Latin statements in the shell.

In Batch Mode a user can save the Pig statements in a single file (usually saved with .pig extension) and then run the file aspig file.pig

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