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From J Mohamed Zahoor <jmo...@gmail.com>
Subject Re: an emtry region
Date Fri, 10 Aug 2012 07:37:11 GMT
Look at this post for more about Catalog Janitor

http://blog.zahoor.in/2012/08/hbase-hmaster-architecture/

On Fri, Aug 10, 2012 at 12:45 PM, J Mohamed Zahoor <jmozah@gmail.com> wrote:

> Hi
> Region don't remain for ever.
> Catalog Janitor chore will scan for unused regions in the META and garbage
> collect. by default it is triggered every 300 sec. The property
> "hbase.catalogjanitor.interval" is used for this.
>
> ./Zahoor
>
>
> On Tue, Aug 7, 2012 at 4:44 PM, Anoop Sam John <anoopsj@huawei.com> wrote:
>
>> 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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