Sent from my BlackBerry 10 smartphone.
Original Message
From: Ted Yu
Sent: Thursday 2 March 2017 15:37
To: user@hbase.apache.org
Reply To: user@hbase.apache.org
Subject: Re: parallel processing of regions in coprocessor
Daniel:
If you don't pass your ExecutorService to HTable ctor, the following would
be called:
public static ThreadPoolExecutor getDefaultExecutor(Configuration conf) {
int maxThreads = conf.getInt("hbase.htable.threads.max", Integer.
MAX_VALUE);
Note the default value.
When the number of regions involved is high, consider adjusting the above
config.
On Wed, Mar 1, 2017 at 11:04 PM, Daniel Połaczański <dpolaczan...@gmail.com>
wrote:
> Yes. I am using batch variant. I will try your variant
>
> 02.03.2017 7:53 AM "Jingcheng Du" <dujin...@gmail.com> napisał(a):
>
> 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 <dpolaczan...@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" <yuzhih...@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 <
> > dpolaczan...@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 <yuzhih...@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 <
> > > > dpolaczan...@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
> > > > > >
> > > > >
> > > >
> > >
> >
>
