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From Mohammad Tariq <donta...@gmail.com>
Subject Re: Rowkey design
Date Sun, 29 Nov 2015 23:06:31 GMT
Hi Marko,

You could add the place(and unit as well) to your key if that's not making
it very long. And then use RowFilter with SubstringComparator to get the
desired rows.

[image: http://]
Tariq, Mohammad
[image: http://]

On Mon, Nov 30, 2015 at 3:49 AM, Marko Dinic <hacker.marko@gmail.com> wrote:

> Hello, everyone!
> I'm new to HBase and I need help designing rowkeys for use case that looks
> like this:
> - Products are listed, where each product has a product id.
> - Each product has a timestamp.
> - Each product is created in certain place (e.g. city)
> - Each product is created by some unit (e.g. factory)
> I would like to be able to scan products from a certain time period on one
> hand, from a certain place, or from a certain unit.
> I read about salting to avoid hot-spotting and I understand that rows are
> sequential by rowkey. This will allow me to scan for a certain time period
> using with following rowkey:
> salt-productId-timestamp
> And I can specify the period using STARTROW, ENDROW.
> What confuses me is how to include place (and maybe unit) into key and be
> able to select products from certain place during certain time period?
> If I limit myself to be able to scan by one of the above (time range OR
> place) I have an idea to duplicate data to two different tables, one with
> (salt-productId-timestamp) and other with (salt-productId-place) keys. Is
> that recommend or not?
> So, how to construct my keys?
> I should emphasize that i need this data to be input to MAPREDUCE JOB.
> Any help is greatly appreciated.
> --
> Best regards,
> Marko

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