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From cem <cayiro...@gmail.com>
Subject Re: Vnodes - HUNDRED of MapReduce jobs
Date Thu, 28 Mar 2013 13:40:11 GMT
Hi Alicia ,

Cassandra input format creates mappers as many as vnodes. It is a known
issue. You need to lower the number of vnodes :(

I have a simple solution for that and ready to write a patch. Should I
create a ticket about that? I don't know the procedure about that.

 Regards,
Cem

On Thu, Mar 28, 2013 at 2:30 PM, Alicia Leong <lccalicia@gmail.com> wrote:

> Hi All,
>
> I have 3 nodes of Cassandra 1.2.3 & edited the cassandra.yaml for vnodes.
>
> When I execute a M/R job .. the console showed HUNDRED of Map tasks.
>
> May I know, is the normal since is vnodes?  If yes, this have slow the M/R
> job to finish/complete.
>
>
> Thanks
>

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