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Subject: Re: Regions and Rowkeys
From: Michael Segel <michael_segel@hotmail.com>
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Date: Tue, 12 May 2015 08:20:53 -0500
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To: user@hbase.apache.org

Yeah, its about time.
What a slacker! :-P

> On May 11, 2015, at 6:56 PM, Jean-Marc Spaggiari =
<jean-marc@spaggiari.org> wrote:
>=20
> This? http://shop.oreilly.com/product/0636920033943.do
>=20
> 2015-05-11 18:55 GMT-04:00 Michael Segel <michael_segel@hotmail.com>:
>=20
>> Why would you expect to have a region allocated to all of the region
>> servers?
>> You generate a region based on either pre-splitting (you set the =
region=E2=80=99s
>> key range) , or you start with one region and grow from there.
>>=20
>> Please read either Lars George=E2=80=99s book (dated) or Nick =
Dimiduk=E2=80=99s book.
>> (Sorry but has Lars George ever done a second or third edition yet? )
>>=20
>>=20
>>> On May 11, 2015, at 5:38 PM, Arun Patel <arunp.bigdata@gmail.com> =
wrote:
>>>=20
>>> I have some basic questions on regions.
>>>=20
>>> 1) I have a 10 node HBase cluster.  When I create a table in HBase, =
how
>>> many regions will be allocated by default?  I looked at the HBase =
Master
>> UI
>>> and it seems regions are not allocated to all the Regionservers by
>>> default.  How can I allocate the regions in all Region Servers?
>> Basically,
>>> This distributes the data in a better way If I am using a slated =
key. My
>>> requirement is to distribute the data across the cluster using =
salted
>>> keys.  But, Having few regions is a constraint?
>>>=20
>>> 2) How does the rowkey to region mapping works?  In Cassandra, we =
have a
>>> concept of assigning token range for each node.  Rowkey will be =
assigned
>> to
>>> a node based on the token range.  How does this work in HBase?
>>>=20
>>> Regards,
>>> Arun
>>=20
>> The opinions expressed here are mine, while they may reflect a =
cognitive
>> thought, that is purely accidental.
>> Use at your own risk.
>> Michael Segel
>> michael_segel (AT) hotmail.com
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20