Re: Patch to send transaction commit/rollback stats to the stats collector unconditionally.

From: Kevin Grittner <kgrittn(at)ymail(dot)com>
To: Gurjeet Singh <gurjeet(at)singh(dot)im>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, PGSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Patch to send transaction commit/rollback stats to the stats collector unconditionally.
Date: 2014-07-02 19:49:27
Message-ID: 1404330567.18289.YahooMailNeo@web122301.mail.ne1.yahoo.com
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In preparing to push the patch, I noticed I hadn't responded to this:

Gurjeet Singh <gurjeet(at)singh(dot)im> wrote:
> Kevin Grittner <kgrittn(at)ymail(dot)com> wrote:
>> I have reviewed this patch, and think we should do what the patch
>> is trying to do, but I don't think the submitted patch would
>> actually work.
>
> Just curious, why do you think it won't work.

Because you didn't touch this part of the function:

    /*
     * Send partial messages.  If force is true, make sure that any pending
     * xact commit/abort gets counted, even if no table stats to send.
     */
    if (regular_msg.m_nentries > 0 ||
        (force && (pgStatXactCommit > 0 || pgStatXactRollback > 0)))
        pgstat_send_tabstat(&regular_msg);

The statistics would not actually be sent unless a table had been
accessed or it was forced because the connection was closing.

--
Kevin Grittner
EDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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