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From Tatu Saloranta <tsalora...@gmail.com>
Subject Re: Is that possible to write a file system over Cassandra?
Date Thu, 15 Apr 2010 02:08:35 GMT
On Wed, Apr 14, 2010 at 6:42 PM, Zhuguo Shi <blueflycn@gmail.com> wrote:
> Hi,
> Cassandra has a good distributed model: decentralized, auto-partition,
> auto-recovery. I am evaluating about writing a file system over Cassandra
> (like CassFS: http://github.com/jdarcy/CassFS ), but I don't know if
> Cassandra is good at such use case?

It sort of depends on what you are looking for. From use case for
which something like S3 is good, yes, except with one difference:
Cassandra is more geared towards lots of small files, whereas S3 is
more geared towards moderate number of files (possibly large).

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.

-+ Tatu +-

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