From: Jesper Pedersen <jesper.pedersen@redhat.com>
To: Alvaro Herrera <alvherre@2ndquadrant.com>
Cc: Laurenz Albe <laurenz.albe@cybertec.at>
Cc: PostgreSQL-development <pgsql-hackers@postgresql.org>
Subject: Re: pg_receivewal documentation
Date: Wed, 10 Jul 2019 11:26:04 -0400
Message-ID: <54779de5-f922-c0cf-629d-b582eded7265@redhat.com> (raw)
In-Reply-To: <20190710142421.GA28387@alvherre.pgsql>
References: <20190710142421.GA28387@alvherre.pgsql>
Hi,
On 7/10/19 10:24 AM, Alvaro Herrera wrote:
> +1 to document this caveat.
>
> How about
> Note that while WAL will be flushed with this setting,
> <application>pg_receivewal</application> never applies it, so
> <xref linkend="guc-synchronous-commit"/> must not be set to
> <literal>remote_apply</literal> if <application>pg_receivewal</application>
> is the only synchronous standby.
> ?
>
Sure.
Best regards,
Jesper
Attachments:v4_pgreceivewal-doc.patch (text/x-patch, 1.3K) download
From cc51d52b2f67b33cd0faba1a74e05e93fc859011 Mon Sep 17 00:00:00 2001
From: jesperpedersen <jesper.pedersen@redhat.com>
Date: Tue, 9 Jul 2019 13:14:25 -0400
Subject: [PATCH] Highlight that pg_receivewal doesn't apply WAL, and as such
synchronous-commit needs to be remote_write or lower.
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Authors: Álvaro Herrera, Laurenz Albe and Jesper Pedersen
Review-by: Álvaro Herrera, Laurenz Albe and Jesper Pedersen
---
doc/src/sgml/ref/pg_receivewal.sgml | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/doc/src/sgml/ref/pg_receivewal.sgml b/doc/src/sgml/ref/pg_receivewal.sgmlindex 0506120c00..16f9c41ff1 100644--- a/doc/src/sgml/ref/pg_receivewal.sgml+++ b/doc/src/sgml/ref/pg_receivewal.sgml@@ -207,6 +207,14 @@ PostgreSQL documentation
server as a synchronous standby, to ensure that timely feedback is
sent to the server.
</para>
++ <para>+ Note that while WAL will be flushed with this setting,+ <application>pg_receivewal</application> never applies it, so+ <xref linkend="guc-synchronous-commit"/> must not be set to+ <literal>remote_apply</literal> if <application>pg_receivewal</application>+ is the only synchronous standby.+ </para>
</listitem>
</varlistentry>
--
2.21.0
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To: pgsql-hackers@postgresql.org
Cc: jesper.pedersen@redhat.com, alvherre@2ndquadrant.com, laurenz.albe@cybertec.at
Subject: Re: pg_receivewal documentation
In-Reply-To: <54779de5-f922-c0cf-629d-b582eded7265@redhat.com>
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