about mercurial data access

[yu xue]

Hello, everyone:
I'm now doing a project which is based on mercurial. Our plan is to base
mercurial on our own distributed filesystem. So we need to know what
mercurial's data access pattern look like.
(1)How does mercurial access data (read/write) and which part of codes are
possible related?

(2)How is it possible to access a distributed filesystem(db) maybe such as
cassandra etc?

(3)How can we make mercurial to take advantage of our distributed
filesystem's security feature such as confidentiality etc?

Thank you!

Regards
   Yu Xue
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