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From Jingcheng Du <dujin...@gmail.com>
Subject Re: parallel processing of regions in coprocessor
Date Thu, 02 Mar 2017 06:53:54 GMT
What APIs are you using to execute the coprocessor?
HTable#batchCoprocessorService? It executes the coprocessors regions by
regions in each region server.
How about using coprocessorService? This API should run coprocessors in
parallel for different regions.

2017-03-02 14:32 GMT+08:00 Daniel Połaczański <dpolaczanski@gmail.com>:

> I invoke my business logic which is similar to map reduce paradigm.
> Everything works. Only performance is problem that regions are not
> processed parallely.
> I'm thinking about some hack like invoking 4 times rpc from client when i
> have 4 regions
>
> 02.03.2017 00:43 "Ted Yu" <yuzhihong@gmail.com> napisał(a):
>
> > To my knowledge, there is no support for this type of combination of map
> > reduce and coprocessor.
> >
> > On Wed, Mar 1, 2017 at 2:55 PM, Daniel Połaczański <
> dpolaczanski@gmail.com
> > >
> > wrote:
> >
> > > It is something like map reduce processing.
> > > I want to run map and combine phase inside in a coprocessor for every
> > > region separately, return partial results to the client. On the client
> > > invoke reduce phase and store result in another hbase table.
> > >
> > > 2017-03-01 23:26 GMT+01:00 Ted Yu <yuzhihong@gmail.com>:
> > >
> > > > Can you describe your use case in more detail ?
> > > >
> > > > What type of custom coprocessor are you loading to the region server
> ?
> > > >
> > > > Thanks
> > > >
> > > > On Wed, Mar 1, 2017 at 2:24 PM, Daniel Połaczański <
> > > dpolaczanski@gmail.com
> > > > >
> > > > wrote:
> > > >
> > > > > Hi,
> > > > > Let's assume that we have cluster consisting from one RegionServer
> > and
> > > > the
> > > > > RegionsServer contains one table consisting from 3 regions.
> > > > >
> > > > > I would like to process regions  in coprocessor parallely. Is it
> > > > possible?
> > > > >
> > > > > I observed that currenlty it invokes coproprocessor with all the
> > > regions
> > > > > one by one. So it process at the beginig region1, when finished
> > process
> > > > > regions2 and ...
> > > > >
> > > > > Is it possible to change this behaviour?
> > > > >
> > > > > Regards
> > > > >
> > > >
> > >
> >
>

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