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From Sreeram <sreera...@gmail.com>
Subject Re: How to implement increment in an idempotent manner
Date Fri, 18 Mar 2016 10:31:20 GMT
All my Hbase processing is going to be inside any given bolt. So I cannot
use the second option.

On Fri, Mar 18, 2016 at 3:46 PM, Jean-Marc Spaggiari <
jean-marc@spaggiari.org> wrote:

> What's about the other option where each bolt increment it's own column and
> at theend ou aggregate those few columns together?
>
> 2016-03-18 6:14 GMT-04:00 Sreeram <sreeram.v@gmail.com>:
>
> > The incremented field is more like an amount field that will be storing
> the
> > aggregate amount. Since the field will be incremented concurrently by
> > multiple bolts running in parallel, storing the value before increment
> and
> > then doing a put in case of replay will not help.
> >
> > Reason to have this field is to pre-compute a certain aggregate amount
> and
> > materialize it in the Hbase table.
> >
> > On Fri, Mar 18, 2016 at 3:30 PM, Jean-Marc Spaggiari <
> > jean-marc@spaggiari.org> wrote:
> >
> > > At the beginning of your Storm bolt process can you not do a put of
> "0"?
> > So
> > > it start back from scratch? Or else you will need to query the value,
> and
> > > keep the value to put it back if you need to replay your bolt
> > >
> > > Other option is, you increment a specific difference column and at the
> > end
> > > if you are successful with your bolt you increment te initial column
> with
> > > the new total counter?
> > >
> > > JMS
> > >
> > > 2016-03-18 5:33 GMT-04:00 Sreeram <sreeram.v@gmail.com>:
> > >
> > > > Hi,
> > > >
> > > >  I am looking for suggestions from community on implementing HBase
> > > > increment in a idempotent manner.
> > > >
> > > >  My use case is a storm Hbase bolt that atomically increments a HBase
> > > > counter. Replay of the storm bolt results in a double increment.
> > > >
> > > >  Any suggestion on the approach to be taken is welcome.
> > > >
> > > >  Thank you.
> > > >
> > > >  Regards,
> > > >  Sreeram
> > > >
> > >
> >
>

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