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Remove pg_dump/pg_dumpall support for dumping from pre-9.2 servers.

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Per discussion, we'll limit support for old servers to those branches
that can still be built easily on modern platforms, which as of now
is 9.2 and up.  Remove over a thousand lines of code dedicated to
dumping from older server versions.  (As in previous changes of
this sort, we aren't removing pg_restore's ability to read older
archive files ... though it's fair to wonder how that might be
tested nowadays.)  This cleans up some dead code left behind by
commit 989596152.

Discussion: https://postgr.es/m/2923349.1634942313@sss.pgh.pa.us
This commit is contained in:
Tom Lane
2021-12-14 17:09:07 -05:00
parent a2ff18e89f
commit 30e7c175b8
5 changed files with 417 additions and 1761 deletions
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19
doc/src/sgml/ref/pg_dump.sgml
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@@ -398,16 +398,6 @@ PostgreSQL documentation
different worker jobs wouldn't be guaranteed to see the same data in
each connection, which could lead to an inconsistent backup.
</para>
<para>
If you want to run a parallel dump of a pre-9.2 server, you need to make sure that the
database content doesn't change from between the time the leader connects to the
database until the last worker job has connected to the database. The easiest way to
do this is to halt any data modifying processes (DDL and DML) accessing the database
before starting the backup. You also need to specify the
<option>--no-synchronized-snapshots</option> parameter when running
<command>pg_dump -j</command> against a pre-9.2 <productname>PostgreSQL</productname>
server.
</para>
</listitem>
</varlistentry>
@@ -945,9 +935,10 @@ PostgreSQL documentation
<term><option>--no-synchronized-snapshots</option></term>
<listitem>
<para>
This option allows running <command>pg_dump -j</command> against a pre-9.2
server, see the documentation of the <option>-j</option> parameter
for more details.
This option allows running <command>pg_dump -j</command> against a
pre-v10 standby server, at the cost of possibly producing an
inconsistent dump. See the documentation of the <option>-j</option>
parameter for more details.
</para>
</listitem>
</varlistentry>
@@ -1381,7 +1372,7 @@ CREATE DATABASE foo WITH TEMPLATE template0;
<productname>PostgreSQL</productname> server versions newer than
<application>pg_dump</application>'s version. <application>pg_dump</application> can also
dump from <productname>PostgreSQL</productname> servers older than its own version.
(Currently, servers back to version 8.0 are supported.)
(Currently, servers back to version 9.2 are supported.)
However, <application>pg_dump</application> cannot dump from
<productname>PostgreSQL</productname> servers newer than its own major version;
it will refuse to even try, rather than risk making an invalid dump.