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From "Brendan Poole" <brendan.po...@new-law.co.uk>
Subject RE: Using Cassandra to store files
Date Fri, 04 Feb 2011 08:37:35 GMT

Hi Daniel 
 
When you say "We are doing this" do you mean via NFS or Cassandra. 
 
Thanks
 
Brendan
 
 
 



     Brendan Poole
     Systems Developer
     NewLaw Solicitors
     Helmont House 
     Churchill Way
     Cardiff
     brendan.poole@new-law.co.uk
     029 2078 4283
     www.new-law.co.uk

________________________________



From: Daniel Doubleday [mailto:daniel.doubleday@gmx.net] 
Sent: 03 February 2011 17:21
To: user@cassandra.apache.org
Subject: Re: Using Cassandra to store files


Hundreds of thousands doesn't sound too bad. Good old NFS would do with
an ok directory structure. 

We are doing this. Our documents are pretty small though (a few kb). We
have around 40M right now with around 300GB total.

Generally the problem is that much data usually means that cassandra
becomes io bound during repairs and compactions even if your hot dataset
would fit in the page cache. There are efforts to overcome this and 0.7
will help with repair problems but for the time being you have to have
quite some headroom in terms of io performance to handle these
situations.  

Here is a related post:

http://comments.gmane.org/gmane.comp.db.cassandra.user/11190


On Feb 3, 2011, at 1:33 PM, Brendan Poole wrote:


	Hi
	 
	Would anyone recommend using Cassandra for storing hundreds of
thousands of documents in Word/PDF format? The manual says it can store
documents under 64MB with no issue but was wondering if anyone is using
it for this specific perpose.  Would it be efficient/reliable and is
there anything I need to bear in mind?
	 
	Thanks in advance
	 

	<Signature.jpg> <http://www.new-law.co.uk/>      Brendan Poole
	     Systems Developer
	      NewLaw Solicitors
	     Helmont House  
	     Churchill Way
	     Cardiff
	     brendan.poole@new-law.co.uk
	     029 2078 4283
	     www.new-law.co.uk <http://www.new-law.co.uk/> 
	
	
	
	 


	
	
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or copying of this communication is prohibited. 

NewLaw Solicitors does not accept any liability for any inaccuracies or omissions in the contents
of this email that may have arisen as a result of transmission.  This message and any 
attachments are believed to be free of any virus or defect that might affect any computer
system into which it is received and opened.  However,it is the responsibility of the recipient
to 
ensure that it is virus free; therefore, no responsibility is accepted for any loss or damage
in any way arising from its use. 

NewLaw Solicitors is the trading name of NewLaw Legal Ltd, a limited company registered in
England and Wales with registered number 07200038.  
NewLaw Legal Ltd is regulated by the Solicitors Regulation Authority whose website is http://www.sra.org.uk


The registered office of NewLaw Legal Ltd is at Helmont House, Churchill Way, Cardiff, CF10
2HE. Tel: 0845 756 6870, Fax: 0845 756 6871, Email: info@new-law.co.uk. www.new-law.co.uk.
 

We use the word ‘partner’ to refer to a shareowner or director of the company, or an employee
or consultant of the company who is a lawyer with equivalent standing and qualifications.
A list 
of the directors is displayed at the above address, together with a list of those persons
who are designated as partners. 
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