Pig Load & Store Functions

Function Description
PigStorage() To load and store structured files.
TextLoader() To load unstructured data into Pig.
BinStorage() To load and store data into Pig using machine readable format.
Handling Compression In Pig Latin, we can load and store compressed data.


grunt> PigStorage(field_delimiter)
grunt> student = LOAD 'hdfs://localhost:9000/pig_data/student_data.txt' USING PigStorage(',')
   as ( id:int, firstname:chararray, lastname:chararray, phone:chararray, city:chararray );
grunt> STORE student INTO ' hdfs://localhost:9000/pig_output/ ' USING PigStorage (',');
$ hdfs dfs -ls 'hdfs://localhost:9000/pig_output/'
$ hdfs dfs -cat 'hdfs://localhost:9000/pig_output/part-m-00000'


grunt> TextLoader()
grunt> details = LOAD 'hdfs://localhost:9000/pig_data/student_details.txt' USING TextLoader();
grunt> dump details;


grunt> BinStorage();
grunt> student_details = LOAD 'hdfs://localhost:9000/pig_data/student_details.txt' USING PigStorage(',')
   as (id:int, firstname:chararray, age:int, city:chararray);
grunt> STORE student_details INTO 'hdfs://localhost:9000/pig_output/mydata' USING BinStorage();
$ hdfs dfs -ls hdfs://localhost:9000/pig_output/mydata/
grunt> result = LOAD 'hdfs://localhost:9000/pig_output/mydata/part-m-00000' USING BinStorage();
grunt> Dump result;

Handling Compression

$ zip employee.txt.zip employee.txt
$ hdfs dfs -put ~/pig/employee.txt.zip hdfs://localhost:9000/pig_data/
grunt> data = LOAD 'hdfs://localhost:9000/pig_data/employee.txt.zip' USING PigStorage(',');
grunt> data = LOAD 'hdfs://localhost:9000/pig_data/employee.txt.zip' USING TextLoader;
grunt> store data INTO 'hdfs://localhost:9000/pig_output/data.bz' USING PigStorage(',');