File formats in Hadoop

File formats in Hadoop 



1)  TextInputFileFormat

2)  KeyValueTextInputFileFormat


  Key is  always delimitter

  Eg :    key=praveen
           value = 18

  Eg: 2

           Praveen,18,male,5000
           Kumar,35,male,45000

          Key=Praveen
          Value=18,male,5000



3)  NlineInputFileFormat


Scenario:  I have 600 records = 2 blocks - 2 splits - 2 mappers
                For every 200 records
  200 records = 2 blocks - 3 splits - 3 mappers.

4)  CombineFileInputFileFormat

     200 files - each file 100kb - 200 splits -  200 mappers