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help / color / mirror / Atom feedFrom: Bruce Momjian <[email protected]>
To: SATYANARAYANA NARLAPURAM <[email protected]>
Cc: Bharath Rupireddy <[email protected]>
Cc: Andrey Borodin <[email protected]>
Cc: Kyotaro Horiguchi <[email protected]>
Cc: Laurenz Albe <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Subject: Re: An attempt to avoid locally-committed-but-not-replicated-to-standby-transactions in synchronous replication
Date: Tue, 29 Nov 2022 11:29:13 -0500
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAHg+QDf9sMJ-r9JqFQTALRy8dX8Mr6SoFEvXx8V-Tto10VcFPA@mail.gmail.com>
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On Tue, Nov 29, 2022 at 08:14:10AM -0800, SATYANARAYANA NARLAPURAM wrote:
> 2. Process proc die immediately when a backend is waiting for sync
> replication acknowledgement, as it does today, however, upon restart,
> don't open up for business (don't accept ready-only connections)
> unless the sync standbys have caught up.
>
>
> Are you planning to block connections or queries to the database? It would be
> good to allow connections and let them query the monitoring views but block the
> queries until sync standby have caught up. Otherwise, this leaves a monitoring
> hole. In cloud, I presume superusers are allowed to connect and monitor (end
> customers are not the role members and can't query the data). The same can't be
> true for all the installations. Could you please add more details on your
> approach?
I think ALTER SYSTEM should be allowed, particularly so you can modify
synchronous_standby_names, no?
--
Bruce Momjian <[email protected]> https://momjian.us
EDB https://enterprisedb.com
Embrace your flaws. They make you human, rather than perfect,
which you will never be.
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Subject: Re: An attempt to avoid locally-committed-but-not-replicated-to-standby-transactions in synchronous replication
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