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From Dhruba Borthakur <dhr...@gmail.com>
Subject Re: Merging old and new values
Date Mon, 17 Jan 2011 20:47:53 GMT
This is definitely interesting to me. Related discussion you can find here:


I plan on doing this via a coprocessor and will upload the patch in a few


On Mon, Jan 17, 2011 at 2:14 AM, <js_84@email.de> wrote:

> Hi,
> we are currently looking into HBase.
> Just what we would require is some kind kind of merging old and new values.
> One example would be an append: instead of table.put we like to have a
> table.merge(PUT, "append").
> In traditional databases this behavior could be achieved by trigger
> functions.
> So here some questions:
> a) Does some way to do so already exist and we overlooked it (Yes, we might
> access old versions and "merge" at query time)
> b)  Any ideas where to start implementing this kind of functionality?
>  (overall idea: provide some merge user defined function which can be
>  specidied at put/merge time)
> c) Is this interesting to other people as well?
> Thanks!
> JS

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