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From Josh Elser <>
Subject Re: Phoenix Mapreduce
Date Tue, 30 Apr 2019 14:34:15 GMT
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 

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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