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From Mohammad Tariq <>
Subject Re: Hive mapper creation
Date Thu, 28 Jun 2012 18:59:13 GMT
Hello Nitin, Bejoy,

        Thanks a lot for the quick response. Could you please tell me
what is the default criterion of split creation??How the splits for a
Hive query are created??(Pardon my ignorance).

    Mohammad Tariq

On Fri, Jun 29, 2012 at 12:22 AM, Bejoy KS <> wrote:
> 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.
> Regards
> Bejoy KS
> Sent from handheld, please excuse typos.
> -----Original Message-----
> From: Mohammad Tariq <>
> Date: Fri, 29 Jun 2012 00:17:05
> To: user<>
> Reply-To:
> 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
> thanks.
> Regards,
>     Mohammad Tariq

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