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Remove server support for the previous base backup protocol.

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Commit cc333f3233 added a new COPY
sub-protocol for taking base backups, but retained support for the
previous protocol. For the same reasons articulated in the message
for commit 9cd28c2e5f, remove support
for the previous protocol from the server.

Discussion: http://postgr.es/m/CA+TgmoazKcKUWtqVa0xZqSzbKgTH+X-aw4V7GyLD68EpDLMh8A@mail.gmail.com
This commit is contained in:
Robert Haas
2022-02-08 11:17:21 -05:00
parent d37776e451
commit 0d4513b613
4 changed files with 21 additions and 197 deletions
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34
doc/src/sgml/protocol.sgml
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@ -2634,13 +2634,8 @@ The commands accepted in replication mode are:
<term><literal>TARGET</literal> <replaceable>'target'</replaceable></term>
<listitem>
<para>
Tells the server where to send the backup. If not specified,
the legacy base backup protocol will be used. Otherwise, the new
protocol will be used, as described below.
</para>
<para>
If the target is <literal>client</literal>, the backup data is
Tells the server where to send the backup. If the target is
<literal>client</literal>, which is the default, the backup data is
sent to the client. If it is <literal>server</literal>, the backup
data is written to the server at the pathname specified by the
<literal>TARGET_DETAIL</literal> option. If it is
@ -2866,25 +2861,8 @@ The commands accepted in replication mode are:
</para>
<para>
After the second regular result set, one or more CopyOutResponse results
will be sent. If the <literal>TARGET</literal> option is not specified,
the legacy base backup protocol will be used. In this mode,
there will be one CopyOutResponse for the main directory, one for each
additional tablespace other than <literal>pg_default</literal> and
<literal>pg_global</literal>, and one for the backup manifested if
requested. The main data directory and any additional tablespaces will
be sent in tar format (following the <quote>ustar interchange
format</quote> specified in the POSIX 1003.1-2008 standard), and
the manifest will sent as a plain file. Prior to
<literal>PostgreSQL</literal> 15, the server omitted the two trailing
blocks of zeroes specified in the standard, but this is no longer the
case.
</para>
<para>
New applications should specify the <literal>TARGET</literal> option.
When that option is used, a single CopyOutResponse will be sent, and
the payload of each CopyData message will contain a message in one of
After the second regular result set, a CopyOutResponse will be sent.
The payload of each CopyData message will contain a message in one of
the following formats:
</para>
@ -2898,6 +2876,10 @@ The commands accepted in replication mode are:
<term>Byte1('n')</term>
<listitem><para>
Identifes the messaage as indicating the start of a new archive.
There will be one archive for the main data directory and one
for each additional tablespace; each will use tar format
(following the <quote>ustar interchange format</quote> specified
in the POSIX 1003.1-2008 standard).
</para></listitem>
</varlistentry>
<varlistentry>