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Remove exclusive backup mode

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Exclusive-mode backups have been deprecated since 9.6 (when
non-exclusive backups were introduced) due to the issues
they can cause should the system crash while one is running and
generally because non-exclusive provides a much better interface.
Further, exclusive backup mode wasn't really being tested (nor was most
of the related code- like being able to log in just to stop an exclusive
backup and the bits of the state machine related to that) and having to
possibly deal with an exclusive backup and the backup_label file
existing during pg_basebackup, pg_rewind, etc, added other complexities
that we are better off without.

This patch removes the exclusive backup mode, the various special cases
for dealing with it, and greatly simplifies the online backup code and
documentation.

Authors: David Steele, Nathan Bossart
Reviewed-by: Chapman Flack
Discussion: https://postgr.es/m/ac7339ca-3718-3c93-929f-99e725d1172c@pgmasters.net
https://postgr.es/m/CAHg+QDfiM+WU61tF6=nPZocMZvHDzCK47Kneyb0ZRULYzV5sKQ@mail.gmail.com
This commit is contained in:
Stephen Frost
2022-04-06 14:41:03 -04:00
parent 14d3f24fa8
commit 39969e2a1e
24 changed files with 246 additions and 1199 deletions
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6
doc/src/sgml/ref/pg_ctl-ref.sgml
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@@ -186,11 +186,11 @@ PostgreSQL documentation
the specified data directory. Three different
shutdown methods can be selected with the <option>-m</option>
option. <quote>Smart</quote> mode disallows new connections, then waits
for all existing clients to disconnect and any online backup to finish.
for all existing clients to disconnect.
If the server is in hot standby, recovery and streaming replication
will be terminated once all clients have disconnected.
<quote>Fast</quote> mode (the default) does not wait for clients to disconnect and
will terminate an online backup in progress. All active transactions are
<quote>Fast</quote> mode (the default) does not wait for clients to disconnect.
All active transactions are
rolled back and clients are forcibly disconnected, then the
server is shut down. <quote>Immediate</quote> mode will abort
all server processes immediately, without a clean shutdown. This choice