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Re: Faster compression, again

From: "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov>
To: "Daniel Farina" <daniel(at)heroku(dot)com>,"Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: "Andrew Dunstan" <andrew(at)dunslane(dot)net>, "Merlin Moncure" <mmoncure(at)gmail(dot)com>, "pgsql-hackers" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Faster compression, again
Date: 2012-03-14 22:08:01
Message-ID: 4F60D07102000025000462C9@gw.wicourts.gov (view raw or flat)
Thread:
Lists: pgsql-hackers
Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
 
> Another not-exactly-trivial requirement is to figure out how to
> not break on-disk compatibility when installing an alternative
> compression scheme.  In hindsight it might've been a good idea if
> pglz_compress had wasted a little bit of space on some sort of
> version identifier ... but it didn't.
 
Doesn't it always start with a header of two int32 values where the
first must be smaller than the second?  That seems like enough to
get traction for an identifiably different header for an alternative
compression technique.
 
-Kevin

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