| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Kevin Grittner <kgrittn(at)gmail(dot)com> |
| Cc: | Mithun Cy <mithun(dot)cy(at)enterprisedb(dot)com>, Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, Peter van Hardenberg <pvh(at)pvh(dot)ca>, "pgsql-jdbc(at)postgresql(dot)org" <pgsql-jdbc(at)postgresql(dot)org> |
| Subject: | Re: [HACKERS] Patch: Implement failover on libpq connect level. |
| Date: | 2016-11-16 15:13:14 |
| Message-ID: | CA+TgmoYDF_iiQNU4V5Vyrs3vFgnozttp+X+=QphvcSoqFWw8bA@mail.gmail.com |
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| Thread: | |
| Lists: | pgsql-hackers pgsql-jdbc |
On Wed, Nov 16, 2016 at 9:02 AM, Kevin Grittner <kgrittn(at)gmail(dot)com> wrote:
> [moving this branch of discussion to pgsql-jdbc]
>
> On Tue, Nov 15, 2016 at 10:31 PM, Mithun Cy <mithun(dot)cy(at)enterprisedb(dot)com> wrote:
>
>> JDBC is sending "show transaction_read_only" to find whether it
>> is master or not.
>
> If true, that's insane. That can be different on each connection
> to the cluster and can change tens of thousands of times per second
> on any connection!
I don't think that's insane. The command is only being issued at
connection startup, and will only be different on different
connections if it's been configured that way.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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