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Track conflict_reason in pg_replication_slots.

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This patch changes the existing 'conflicting' field to 'conflict_reason'
in pg_replication_slots. This new field indicates the reason for the
logical slot's conflict with recovery. It is always NULL for physical
slots, as well as for logical slots which are not invalidated. The
non-NULL values indicate that the slot is marked as invalidated. Possible
values are:

wal_removed = required WAL has been removed.
rows_removed = required rows have been removed.
wal_level_insufficient = the primary doesn't have a wal_level sufficient
to perform logical decoding.

The existing users of 'conflicting' column can get the same answer by
using 'conflict_reason' IS NOT NULL.

Author: Shveta Malik
Reviewed-by: Amit Kapila, Bertrand Drouvot, Michael Paquier
Discussion: https://postgr.es/m/ZYOE8IguqTbp-seF@paquier.xyz
This commit is contained in:
Amit Kapila
2024-01-04 08:21:51 +05:30
parent 29275b1d17
commit 007693f2a3
8 changed files with 90 additions and 49 deletions
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29
doc/src/sgml/system-views.sgml
View File

@@ -2525,11 +2525,34 @@ SELECT * FROM pg_locks pl LEFT JOIN pg_prepared_xacts ppx
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>conflicting</structfield> <type>bool</type>
<structfield>conflict_reason</structfield> <type>text</type>
</para>
<para>
True if this logical slot conflicted with recovery (and so is now
invalidated). Always NULL for physical slots.
The reason for the logical slot's conflict with recovery. It is always
NULL for physical slots, as well as for logical slots which are not
invalidated. The non-NULL values indicate that the slot is marked
as invalidated. Possible values are:
<itemizedlist spacing="compact">
<listitem>
<para>
<literal>wal_removed</literal> means that the required WAL has been
removed.
</para>
</listitem>
<listitem>
<para>
<literal>rows_removed</literal> means that the required rows have
been removed.
</para>
</listitem>
<listitem>
<para>
<literal>wal_level_insufficient</literal> means that the
primary doesn't have a <xref linkend="guc-wal-level"/> sufficient to
perform logical decoding.
</para>
</listitem>
</itemizedlist>
</para></entry>
</row>
</tbody>