Pig Latin basics in Hadoop - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Pig Latin in the context of Hadoop?

Pig Latin is a simple scripting language used with Apache Pig to process and analyze large data sets on Hadoop. It makes writing MapReduce jobs easier by using a high-level language.

beginner

How do you load data into Pig Latin?

You use the LOAD statement to read data from the Hadoop file system into a relation. For example: <br>data = LOAD 'input.txt' USING PigStorage(',');

beginner

What is a relation in Pig Latin?

A relation is like a table or dataset in Pig Latin. It holds rows of data and can be transformed with operations like FILTER, GROUP, and JOIN.

beginner

How do you filter data in Pig Latin?

You use the FILTER statement to select rows that meet a condition. For example: <br>filtered_data = FILTER data BY age > 30; selects rows where age is greater than 30.

beginner

How do you store the results of a Pig Latin script?

You use the STORE statement to save the output relation back to the Hadoop file system. For example: <br>STORE filtered_data INTO 'output' USING PigStorage(',');

Which statement is used to read data into Pig Latin?

A LOAD

B STORE

C FILTER

D JOIN

LOAD reads data from the Hadoop file system into a Pig relation.

What does the FILTER statement do in Pig Latin?

A Joins two datasets

B Selects rows based on a condition

C Saves data to disk

D Loads data from HDFS

FILTER selects rows that meet a specified condition.

In Pig Latin, what is a relation?

A A Hadoop cluster

B A type of file

C A function

D A dataset or table

A relation is a dataset or table holding rows of data.

Which statement saves the output of a Pig Latin script?

A LOAD

B FILTER

C STORE

D GROUP

STORE saves the processed data back to the Hadoop file system.

What is the main purpose of Pig Latin?

A To simplify writing MapReduce jobs

B To write complex Java code

C To manage Hadoop clusters

D To store data in HDFS

Pig Latin simplifies writing MapReduce jobs with a high-level scripting language.

Explain how you would load, filter, and store data using Pig Latin.

Think about the sequence: read data, select rows, save results.

Describe what a relation is in Pig Latin and why it is important.

Relations hold your data and let you apply operations.