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From anil gupta <anilgupt...@gmail.com>
Subject Re: HBase co-processor performance
Date Thu, 16 Jul 2015 15:21:45 GMT
Yes, If possible, try to denormalize data and reduce number of calls. Its
ok to store some redundant data with each row due to denormalization.


On Thu, Jul 16, 2015 at 6:18 AM, Chandrashekhar Kotekar <
shekhar.kotekar@gmail.com> wrote:

> Hi,
>
> Thanks for the inputs. As you said, it is better to change database design
> than moving this business logic to co-processors, and sorry for duplicate
> mail. I guess duplicate mail was in my mobile's outbox and after syncing
> mobile that mail was sent.
>
>
> Regards,
> Chandrash3khar Kotekar
> Mobile - +91 8600011455
>
> On Wed, Jul 15, 2015 at 12:40 PM, anil gupta <anilgupta84@gmail.com>
> wrote:
>
> > Using coprocessor to make calls to other Tables or remote Regions is an
> > ANTI-PATTERN. It will create cyclic dependency between RS in your
> cluster.
> > Coprocessors should be strictly used for operation on local Regions.
> Search
> > mailing archives for more detailed discussion on this topic.
> >
> > How about denormalizing the data and then just doing ONE call? Now, this
> > becomes more of a data modeling question.
> >
> > Thanks,
> > Anil Gupta
> >
> >
> > On Tue, Jul 14, 2015 at 11:39 PM, Chandrashekhar Kotekar <
> > shekhar.kotekar@gmail.com> wrote:
> >
> > > Hi,
> > >
> > > REST APIs of my project make 2-3 calls to different tables in HBase.
> > These
> > > calls are taking 10s of milli seconds to finish.
> > >
> > > I would like to know
> > >
> > > 1) If moving business logic to HBase co-processors and/or observer will
> > > improve performance?
> > >
> > > Idea is like to pass all the related information to HBase co-processors
> > > and/or observer, co-processor will make those 2-3 calls to different
> > HBase
> > > tables and return result to the client.
> > >
> > > 2) I wonder if this approach will reduce time to finish or is it a bad
> > > approach?
> > >
> > > 3) If co-processor running on one region server fetches data from other
> > > region server then it will be same as tomcat server fetching that data
> > from
> > > HBase region server. Isn't it?
> > >
> > > Regards,
> > > Chandrash3khar Kotekar
> > > Mobile - +91 8600011455
> > >
> >
> >
> >
> > --
> > Thanks & Regards,
> > Anil Gupta
> >
>



-- 
Thanks & Regards,
Anil Gupta

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