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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Andres Freund <andres@anarazel.de>
Cc: Robert Haas <robertmhaas@gmail.com>
Cc: Thomas Munro <thomas.munro@gmail.com>
Cc: Alvaro Herrera <alvherre@2ndquadrant.com>
Cc: Daniel Gustafsson <daniel@yesql.se>
Cc: Jonathan S. Katz <jkatz@postgresql.org>
Cc: Alexander Korotkov <a.korotkov@postgrespro.ru>
Cc: PostgreSQL Hackers <pgsql-hackers@postgresql.org>
Cc: Peter Geoghegan <pg@bowt.ie>
Cc: Bruce Momjian <bruce@momjian.us>
Cc: David Rowley <dgrowleyml@gmail.com>
Subject: Re: Improving connection scalability: GetSnapshotData()
Date: Sun, 16 Aug 2020 17:28:46 -0400
Message-ID: <1020079.1597613326@sss.pgh.pa.us> (raw)
In-Reply-To: <20200816211146.nodohy6ck6mzfjwi@alap3.anarazel.de>
References: <20200812001938.ixenvxdpg4ielbue@alap3.anarazel.de>
	<CA+hUKGKdey77=asfyBd+-Hnmz6Y_R+TZ+wtogaTppEdVTCH+rw@mail.gmail.com>
	<20200812173855.s4co5jz67z7tlnl7@alap3.anarazel.de>
	<872191.1597504251@sss.pgh.pa.us>
	<20200815164200.drok4tt5ju7ijivf@alap3.anarazel.de>
	<20200816181604.l54m6kss5ntd6xow@alap3.anarazel.de>
	<1006917.1597602624@sss.pgh.pa.us>
	<1013484.1597609043@sss.pgh.pa.us>
	<20200816203153.xqfvuevinjkweuez@alap3.anarazel.de>
	<20200816205258.pjvmoljrk7ntqb3n@alap3.anarazel.de>
	<20200816211146.nodohy6ck6mzfjwi@alap3.anarazel.de>

Andres Freund <andres@anarazel.de> writes:
> For the first, one issue is that there's no obviously good candidate for
> an uninitialized xid. We could use something like FrozenTransactionId,
> which may never be in the procarray. But it's not exactly pretty.

Huh?  What's wrong with using InvalidTransactionId?

			regards, tom lane

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  Cc: tgl@sss.pgh.pa.us, andres@anarazel.de, robertmhaas@gmail.com, thomas.munro@gmail.com, alvherre@2ndquadrant.com, daniel@yesql.se, jkatz@postgresql.org, a.korotkov@postgrespro.ru, pg@bowt.ie, bruce@momjian.us, dgrowleyml@gmail.com
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