Re: WIP: Data at rest encryption

From: Andres Freund <andres(at)anarazel(dot)de>
To: Bruce Momjian <bruce(at)momjian(dot)us>
Cc: Stephen Frost <sfrost(at)snowman(dot)net>, Robert Haas <robertmhaas(at)gmail(dot)com>, Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, Ants Aasma <ants(dot)aasma(at)eesti(dot)ee>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: WIP: Data at rest encryption
Date: 2017-06-15 23:56:36
Message-ID: 20170615235636.7rk3mhbww6h2f5zp@alap3.anarazel.de
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On 2017-06-15 19:44:43 -0400, Bruce Momjian wrote:
> Understood, but now you are promoting a feature with an admittedly-poor
> API, duplication of an OS feature, and perhaps an invasive change to the
> code.

*Perhaps* an invasive change to the code? To me it's pretty evident
that this'll be a pretty costly feature from that angle. We've quite a
few places that manipulate on-disk files, and they'll all have to be
manipulated. Several of those are essentially critical sections, adding
memory allocations to them wouldn't be good, so we'll need
pre-allocation APIs.

I've only skimmed the discussion, but based on that I'm very surprised
how few concerns about this feature's complexity / maintainability
impact have been raised.

- Andres

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