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From Daniel Doubleday <>
Subject Re: Using Cassandra to store files
Date Thu, 03 Feb 2011 17:21:20 GMT
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:

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
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