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From Miguel Verde <miguelitov...@gmail.com>
Subject Re: Is that possible to write a file system over Cassandra?
Date Thu, 15 Apr 2010 02:24:26 GMT
On Wed, Apr 14, 2010 at 9:15 PM, Ken Sandney <blueflycn@gmail.com> wrote:

> Large files can be split into small blocks, and the size of block can be
> tuned. It may increase the complexity of writing such a file system, but can
> be for general purpose (not only for relative small files)


 Right, this is the path that MongoDB has taken with GridFS:
http://www.mongodb.org/display/DOCS/GridFS+Specification

I don't have any use for such a filesystem, but if I were to design one I
would probably mostly follow Tatu's suggestions:


>  On Thu, Apr 15, 2010 at 10:08 AM, Tatu Saloranta <tsaloranta@gmail.com>wrote:
>>
>> So I think it can definitely be a good use case, and I may use
>> Cassandra for this myself in future. Having range queries allows
>> implementing directory/path structures (list keys using path as
>> prefix). And you can split storage such that metadata could live in
>> OPP partition, raw data in RP.
>
>
but using OPP for all data, using prefixed metadata, and UUID_chunk# for
keys in the chunk CF.

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