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From Stack <st...@duboce.net>
Subject Re: Some queestions about HBase Architecture
Date Fri, 01 Jul 2011 17:51:43 GMT

Looks like Florin has some feedback for you!


On Fri, Jul 1, 2011 at 7:09 AM, Florin P <florinpico@yahoo.com> wrote:
> Hello!
>  I've read the HBase architecture from the book
> http://hbase.apache.org/book.html#architecture (HBA)
> and confronted with HBase definitive guide (HBDG)
> http://ofps.oreilly.com/titles/9781449396107/architecture.html
> Some questions raised:
> 1. How many MemStores can have Region?
>  HBDG: "A HRegion also has a MemStore"
>  HBA: "A Store hosts a MemStore". A Store corresponds to a column family for a table
for a given region.
> 2. How many HLog instances are created per Region Servers?
>   HBDG:"A HRegion also has [...] a HLog instance"
>   HBA: "[...]and there is one HLog instance per RegionServer. "
> 3. After reading the HBA, I've concluded (please correct me if I'm wrong), that the are
these reletionships
>   a) A RegionServer has one HLog instance
>   b) A RegionServer has one .META. table that holds meta information about many HTable
>   c) A HTable can be split in many Regions.
>   d) A HTable can have many column family
>   e) A Column family has one Store
>   f) A Store can have zero ore more HFile instances
>   g) A Store can one MemStore
>   h) A column family can have zero or many columns
> I'll look forward for your opinions and answers...and please complete with your knowledge.
> Thank you.
>  Regards,
>  Florin

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