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From Imran M Yousuf <imyou...@gmail.com>
Subject Re: newbie: need help on understanding HBase
Date Fri, 13 Nov 2009 02:16:28 GMT
On Fri, Nov 13, 2009 at 8:02 AM, Tatsuya Kawano
<tatsuya6502@modolab.info> wrote:
> Hi Imran,
>
>> * Where can I read up on or checkout samples RDBMS schemas converted
>> to HBase schema? Basically, I want to read up efficient schema design
>> for different cardinal relationships between objects.
>
> I would recommend the following presentations and paper:
>
> Practical HBase  [ Page 27 -- 33 ]
> by Jon Gray and Michael Stack, Apachecon2009 in Oakland
> http://wiki.apache.org/hadoop/HBase/HBasePresentations?action=AttachFile&do=view&target=ApacheCon2009_Practical_HBase-1.pdf
>
>
> Paper: No Relation: The Mixed Blessings of Non-Relational&Databases
> by Ian Thomas Varley
> http://ianvarley.com/UT/MR/Varley_MastersReport_Full_2009-08-07.pdf
>
>
> HBase Schema Design -- Case Studies
> by Evan(Qingyan) Liu
> http://www.slideshare.net/hmisty/20090713-hbase-schema-design-case-studies
>
>
> There are some fundamental differences to RDBMS schema design:
>
> -- De-normalization is the key to design HBase schemas.
> -- Carefully pick the primary key, try to fulfill all queries without
> having secondary indices. Use composite primary key if you need.
> -- Be aware you can store a value not only in the cell but also column
> qualifier.
> -- Each cell is byte array and typeless, and you can store
> multi-values in a cell by serializing them with Google protobuf,
> Apache Avro or JSON.
>

Thanks a lot for the pointers...Read them and now I have new questions
and looking to clarify them :). The questions are -
* Definition of Column family, column and cell. And their use cases.

Thanks a lot again,

Imran

>
> Hope this helps,
>
> --
> Tatsuya Kawano (Mr.)
> Tokyo, Japan
>
>
>
> On Thu, Nov 12, 2009 at 11:13 PM, Imran M Yousuf <imyousuf@gmail.com> wrote:
>> Hi!
>>
>> I am absolutely new to HBase. All I have done is to read up
>> documentation, presentation and getting a single instance up and
>> running. I am starting on a Content Management System which will be
>> used as a backend for multiple web applications of different natures.
>> In the CMS:
>> * User can define their content known as content type.
>> * Content can have  one-2-many one-2-one and many-2-many relationship
>> with other contents.
>> * Content fields should be versioned
>> * Content type can change in runtime, i.e. fields (a.k.a. columns in
>> HBase) added and removal will not be allowed just yet.
>> * Every content type will have a corresponding grammer to validate
>> content of its type.
>> * It will have authentication and authorization
>> * It will have full text search based on Lucene/Katta.
>>
>> Based on these requirements I have the following questions that I
>> would like feedback on:
>> * Reading articles and presentations it looks to be HBase is a perfect
>> match as it supports multi-dimensional rows, versioned cells, dynamic
>> schema modification. But I could not understand what is the definition
>> of "Big Data" - that is if a content size is roughly 1~100kB
>> (field/cell size 0~100kB), is HBase meant for such uses?
>> * Since I am not sure how much load the site will have, I am planning
>> to setup DN+RS on Rackspace cloud instances with 2GB/80GB HDD with a
>> view of with revenue and pageviews increasing, more moderate
>> "commodity" hardware can be added progressively. Any
>> comments/suggestions on this strategy?
>> * Where can I read up on or checkout samples RDBMS schemas converted
>> to HBase schema? Basically, I want to read up efficient schema design
>> for different cardinal relationships between objects.
>>
>> Thank you,
>>
>> --
>> Imran M Yousuf
>> Entrepreneur & Software Engineer
>> Smart IT Engineering
>> Dhaka, Bangladesh
>> Email: imran@smartitengineering.com
>> Blog: http://imyousuf-tech.blogs.smartitengineering.com/
>> Mobile: +880-1711402557
>



-- 
Imran M Yousuf
Entrepreneur & Software Engineer
Smart IT Engineering
Dhaka, Bangladesh
Email: imran@smartitengineering.com
Blog: http://imyousuf-tech.blogs.smartitengineering.com/
Mobile: +880-1711402557

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