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From Shawn Li <shawnli...@gmail.com>
Subject Re: Phoenix Mapreduce
Date Tue, 30 Apr 2019 17:16:41 GMT
Got it, thanks for the clarification, Josh!

On Tue, Apr 30, 2019, 10:34 AM Josh Elser <elserj@apache.org> wrote:

> No, you will not "lose" data. You will just have mappers that read from
> more than one Region (and thus, more than one RegionServer). The hope in
> this approach is that we can launch Mappers on the same node of the
> RegionServer hosting your Region and avoid any reading any data over the
> network.
>
> This is just an optimization.
>
> On 4/30/19 10:12 AM, Shawn Li wrote:
> > Hi,
> >
> > The number of Map in Phoenix Mapreduce is determined by table region
> > number. My question is: if the region is split due to other injection
> > process while Phoenix Mapreduce job is running, do we lose reading some
> > data due to this split? As now we have more regions than maps, and the
> > maps only have region information before split.
> >
> > Thanks,
> > Shawn
>

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