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Morph pg_replication_slots.min_safe_lsn to safe_wal_size

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The previous definition of the column was almost universally disliked,
so provide this updated definition which is more useful for monitoring
purposes: a large positive value is good, while zero or a negative value
means danger.  This should be operationally more convenient.

Backpatch to 13, where the new column to pg_replication_slots (and the
feature it represents) were added.

Author: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Author: Álvaro Herrera <alvherre@alvh.no-ip.org>
Reported-by: Fujii Masao <masao.fujii@oss.nttdata.com>
Discussion: https://postgr.es/m/9ddfbf8c-2f67-904d-44ed-cf8bc5916228@oss.nttdata.com
This commit is contained in:
Alvaro Herrera
2020-07-07 13:08:00 -04:00
parent da6b6ff95b
commit c54b5891f4
9 changed files with 62 additions and 36 deletions
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7
doc/src/sgml/catalogs.sgml
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@ -11275,10 +11275,13 @@ SELECT * FROM pg_locks pl LEFT JOIN pg_prepared_xacts ppx
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>min_safe_lsn</structfield> <type>pg_lsn</type>
<structfield>safe_wal_size</structfield> <type>int8</type>
</para>
<para>
The minimum LSN currently available for walsenders.
The number of bytes that can be written to WAL such that this slot
is not in danger of getting in state "lost". It is NULL for lost
slots, as well as if <varname>max_slot_wal_keep_size</varname>
is <literal>-1</literal>.
</para></entry>
</row>
</tbody>