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HBase >> mail # user >> multitable query


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Re: multitable query
Thank you, I am trying to avoid to fetch by gets and would like to do
something like hadoop MultipleInputs.
Yes, it would be nice if i could denormalize and remodel the schema.

On Fri, Aug 10, 2012 at 6:29 AM, Amandeep Khurana <[EMAIL PROTECTED]> wrote:

> You can scan over one of the tables (using TableInputFormat) and do simple
> gets on the other table for every row that you want to join.
>
> An interesting question to address here would be - why even need a join.
> Can you talk more about the data and what you are trying to do? In general
> you really want to denormalize and not need joins when working with HBase
> (or for that matter most NoSQL stores).
>
> On Fri, Aug 10, 2012 at 6:52 PM, Weishung Chung <[EMAIL PROTECTED]>
> wrote:
>
> > Basically a join of two data sets on the same row key.
> >
> > On Fri, Aug 10, 2012 at 6:12 AM, Amandeep Khurana <[EMAIL PROTECTED]>
> > wrote:
> >
> > > How do you want to use two tables? Can you explain your algo a bit?
> > >
> > > On Fri, Aug 10, 2012 at 6:40 PM, Weishung Chung <[EMAIL PROTECTED]>
> > > wrote:
> > >
> > > > Hi HBase users,
> > > >
> > > > I need to pull data from 2 HBase tables in a mapreduce job. For 1
> table
> > > > input, I use TableMapReduceUtil.initTableMapperJob. Is there another
> > > method
> > > > for multitable inputs ?
> > > >
> > > > Thank you,
> > > > Wei Shung
> > > >
> > >
> >
>