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From Michael Drzal <mdr...@gmail.com>
Subject Re: HBase & BigTable + History: Can it run decently on a 512MB machine? What's the difference between the two?
Date Mon, 05 Mar 2012 14:45:44 GMT
You really need to consider the entire historical context here.  A lot of
the memory used in hbase is buffering writes to disk and for the block
cache.  These days, it isn't unreasonable to get 12 2-3TB disks in a
commodity server.  Back in 2003, you would not get as many disks, and they
would be much smaller.  One way to think about it is the ratio of RAM/disk
space or more operationally what your cache hit ratio is and how busy your
disk drives are.


On Mon, Mar 5, 2012 at 3:25 AM, D S <desmisnm@gmail.com> wrote:

> Hi,
> I'm learning more about HBase and I'm curious how much of HBase is
> actually based on Google's original dB.  In Google's origins stories,
> they are well known for using low cost commodity hardware in scale in
> order to store their web database.
> Almost every blog I read about HBase tells me it's a clone of
> BigTable.  Almost every blog I've read about HBase also tells me to
> use a lot of RAM - gigabytes worth.  Some even tell me not to even
> consider HBase with less than 4GB of RAM.
> If I remember my history correctly, a commodity machine in the year
> 2003 had around 512MB to 1GB of RAM in it.  The fancier ones had, 2GB.
>  From everything I've read, running HBase on such machines is a very
> bad idea yet this was the machines readily available in the year 2003
> when Google started it's growth.
> I'm confused at the moment.  Can someone give me a bit of background
> about how HBase performance is handled from the "low" end which was
> considered "high" end back then?  Should I assume that HBase is just a
> clone of BigTable?  What is HBase's history?  Are the blogs wrong?
> Thanks for any clarification anyone can give.

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