This functionality enables repmgrd (when running on the primary) to
monitor connected child nodes. It will log connections and disconnections
and generate events.
Additionally, repmgrd can execute a custom script if the number of connected
child nodes falls below a configurable threshold. This script can be used
e.g. to "fence" the primary following a failover situation where a new primary
has been promoted and all standbys are now child nodes of that primary.
In Barman mode, if there is an existing, populated data directory, and
the "--force" option is provided, the entire directory was being deleted,
and later recreated as part of the rsync process, but with the default
permissions.
Fix this by recreating the data directory with the correct permissions
after deleting it.
If --siblings-follow is not supplied, list all nodes which repmgr considers
to be siblings (this will include the witness server, if in use), and
which will remain attached to the old primary.
Improve sample PostgreSQL replication configuration, including
links to the PostgreSQL documentation for each configuration item.
Also set "max_replication_slots" to the same value as "max_wal_senders"
to ensure the sample configuration will work regardless of whether
replication slots are in use, though we do still encourage careful
reading of the comments in the sample configuration and the documentation
in general.
In "recovery.conf", the configuration parameter "node_name" is used
as the "application_name" value, which will be truncated by PostgreSQL
to 63 characters (NAMEDATALEN - 1).
repmgr sometimes needs to be able to extract the application name from
pg_stat_replication to determine if a node is connected (e.g. when
executing "repmgr standby register"), so the comparison will fail
if "node_name" exceeds 63 characters.
1. The target additional-maintainer-clean was misspelled as
maintainer-additional-clean.
2. Add add missing clean targets, in particular sysutils.o, config.h,
repmgr_version.h, and Makefile.global. While at it, use a wildcard
for obj files.
3. Don't delete configure.
4. Remove generated file doc/version.sgml from the repo.
5. Have maintainer-clean recurse to the doc directory.
If "failover_validation_command" is set, and the command returns an error,
rerun the election.
There is a pause between reruns to avoid "churn"; the length of this pause
is controlled by the configuration parameter "election_rerun_interval".
This enable selection of the method repmgrd uses to check whether the upstream
node is available. Possible values are:
- "ping" (default): uses PQping() to check server availability
- "connection": executes a query on the connection to check server
availability (similar to repmgr3.x).
Previously, if PostgreSQL was not running on the node, repmgrd and
pause status were shown as "0", implying their status was known.
This brings the csv output in line with the human-readable output,
which displays "n/a" in this case.
With long-running copy operations, it's possible the connection(s) to
the primary/source server may go away for some reason, so recheck
their availability before attempting to reuse.
