From: | Peter Eisentraut <peter_e(at)gmx(dot)net> |
---|---|
To: | Fujii Masao <fujii(at)postgresql(dot)org>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: [COMMITTERS] pgsql: Add --synchronous option to pg_receivexlog, for more reliable WA |
Date: | 2015-09-16 02:25:09 |
Message-ID: | 55F8D305.9040506@gmx.net |
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Lists: | pgsql-committers pgsql-hackers |
On 11/17/14 12:34 PM, Fujii Masao wrote:
> Add --synchronous option to pg_receivexlog, for more reliable WAL writing.
The last two sentences of this piece of documentation are a bit
hand-wavy and hard to parse. Could you clarify this?
<varlistentry>
<term><option>-S <replaceable>slotname</replaceable></option></term>
<term><option>--slot=<replaceable class="parameter">slotname</replaceable></option></term>
<listitem>
<para>
Require <application>pg_receivexlog</application> to use an existing
replication slot (see <xref linkend="streaming-replication-slots">).
When this option is used, <application>pg_receivexlog</> will report
a flush position to the server, indicating when each segment has been
synchronized to disk so that the server can remove that segment if it
is not otherwise needed. <literal>--synchronous</literal> option must
be specified when making <application>pg_receivexlog</> run as
synchronous standby by using replication slot. Otherwise WAL data
cannot be flushed frequently enough for this to work correctly.
</para>
</listitem>
</varlistentry>
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