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From Anoop Sam John <anoo...@huawei.com>
Subject RE: an emtry region
Date Tue, 07 Aug 2012 11:14:34 GMT
Hi, 
>Now could I merge those two regions or automatically delete that region.
There is no automatic deletion of regions which will happen within HBase. Yes u can write
code which can do the merge of the 2 regions so that only one region will exists.
Having more and more empty regions(unwanted region) is an overhead only. 

-Anoop-
________________________________________
From: samar kumar [samar.opensource@gmail.com]
Sent: Tuesday, August 07, 2012 4:32 PM
To: user@hbase.apache.org
Subject: Re: an emtry region

@Syed Thanks for respond
 Lets assume that we had a huge table which got split into two regions.
Later all the rows for that region was deleted. So now we have one table,
two regions with the second region empty. Table could possible have more
that one CF. also can't remove the CF because it is still relevant and
data is present in the first region for that particular CF.
Now could I merge those two regions or automatically delete that region.
Samar

On 07/08/12 4:19 PM, "syed kather" <in.abdul@gmail.com> wrote:

> samar kumar,
>
>   If all the rows of an region are deleted what happens to the region.
>Would it still exist .?
> Yes it will exist . Whenever you create a family HBase will create
>a separate Space for that Column Family . If there data available for then
>that data will be written to HFile which is create for that column family
>space. If you need  to remove column family completely you have a write
>the separate code to handle this
>
>Also what is the cost of having a empty region?
>I also don't have proper explanation for this
>
>
>On Tue, Aug 7, 2012 at 4:03 PM, samar kumar
><samar.opensource@gmail.com>wrote:
>
>> Please read the subject as  "an empty region"
>>
>> From:  samar kumar <samar.opensource@gmail.com>
>> Date:  Tue, 07 Aug 2012 15:57:04 +0530
>> To:  "user@hbase.apache.org" <user@hbase.apache.org>
>> Subject:  an emtry region
>>
>> Hi Hbase users,
>> If all the rows of an region are deleted what happens to the region.
>>Would
>> it still exist . It can be removed by writing some code but can it be
>> removed automatically. Also what is the cost of having a empty region.
>> Regards,
>> Samar
>>
>>
>>
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