Re: lcr v5 - introduction of InvalidCommandId

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Andres Freund <andres(at)2ndquadrant(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: lcr v5 - introduction of InvalidCommandId
Date: 2013-09-09 20:30:17
Message-ID: CA+TgmoaMEFZQ-gKqxLfkYZKXyOjFnJBh+bfS67AO6svekJQq_Q@mail.gmail.com
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On Thu, Sep 5, 2013 at 3:23 PM, Andres Freund <andres(at)2ndquadrant(dot)com> wrote:
>> > Oh. I hadn't looked at the patch, but I had (mis)read what Robert said
>> > to think that you were proposing introducing InvalidCommandId = 0xFFFFFFFF
>> > while leaving FirstCommandId alone. That would make more sense to me as
>> > (1) it doesn't change the interpretation of anything that's (likely to be)
>> > on disk; (2) it allows the check for overflow in CommandCounterIncrement
>> > to not involve recovering from an *actual* overflow. With the horsing
>> > around we've been seeing from the gcc boys lately
>>
>> Ok, I can do it that way. LCR obviously shouldn't care.
>
> It doesn't care to the point that the patch already does exactly what
> you propose. It's just my memory that remembered things differently.
>
> So, a very slightly updated patch attached.

Committed.

--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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