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From "Bejoy KS" <>
Subject Re: Hive mapper creation
Date Thu, 28 Jun 2012 18:52:52 GMT
Hi Mohammed

Internally In hive the processing is done using MapReduce. So like in mapreduce the splits
are calculated on job submission and a mapper is assigned per split. So a mapper ideally process
a split and not a row.

You can store data in various formats as text, sequence files, RC files etc. No restriction
just on text files.

Bejoy KS

Sent from handheld, please excuse typos.

-----Original Message-----
From: Mohammad Tariq <>
Date: Fri, 29 Jun 2012 00:17:05 
To: user<>
Subject: Hive mapper creation

Hello list,

         Since Hive tables are assumed to be of text input format, is
it right to assume that a mapper is created per row of a particular
table??Please correct me if my understanding is wrong. Also let me
know how mappers are created corresponding to a Hive query. Many

    Mohammad Tariq
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