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From Anoop Sam John <anoo...@huawei.com>
Subject RE: connect to the region from coprocessor
Date Wed, 10 Oct 2012 12:41:49 GMT
>I mean, if cells are big, they might be on different regions / regionservers?
All the KVs [columns, versions] corresponding to one rowkey will be always there in one region.
One row is not splittable

-Anoop-
________________________________________
From: Jean-Marc Spaggiari [jean-marc@spaggiari.org]
Sent: Wednesday, October 10, 2012 5:24 PM
To: user@hbase.apache.org
Subject: Re: connect to the region from coprocessor

But is it possible that the previous value for this row to be stored
in another region?

I mean, if cells are big, they might be on different regions / regionservers?

2012/10/10, Anoop Sam John <anoopsj@huawei.com>:
> Hi
>     To your prePut() method you are getting an ObserverContext argument.
> From this you can easily get a ref to the current region.
> ctx.getEnvironment().getRegion()
> Directly make calls to this region object. Creation of the HTable instance
> and making a get() will be too much unwanted overhead.
>
> -Anoop-
> ________________________________________
> From: Wei Tan [wtan@us.ibm.com]
> Sent: Wednesday, October 10, 2012 2:05 AM
> To: hbase-user@hadoop.apache.org
> Subject: connect to the region from coprocessor
>
> Hi,
>
> In my preput coprocessor I would like to get the old value of the row been
> input. Now I am creating a HTable instance and using the get interface;
> function wise it works fine. Given the row is physically in the same
> region as the cp, is there any lightweight approach doing that?
>
> Thanks!
>
>
> Best Regards,
> Wei
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