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From Asaf Mesika <asaf.mes...@gmail.com>
Subject Re: the scan will be executed parallel if not use coprocessor?
Date Sun, 14 Jul 2013 15:15:02 GMT
To my knowledge, scan is not parallel, hence the speed of queries of
Impala, Phoenix, and other similar projects.

On Saturday, July 13, 2013, ch huang wrote:

> hi ted ,for example i have a table with 10 regions, if i offer the
> condition hit the data of 8 regions,is it different do it use oraginal scan
> and use coprocessor? i know coprocessor can do it parallel for each region
> ,but why the oraginal scan will slow than coprocessor?
>
>
>
> On Sat, Jul 13, 2013 at 7:36 PM, Ted Yu <yuzhihong@gmail.com<javascript:;>>
> wrote:
>
> > Can you clarify your question a little bit ?
> >
> > That is, are you expecting parallel scan within region boundary or across
> > boundaries ?
> >
> > Cheers
> >
> > On Jul 13, 2013, at 1:43 AM, ch huang <justlooks@gmail.com<javascript:;>>
> wrote:
> >
> > > ATT
> >
>


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