Ensure repmgr checks the standby (promotion candidate) is currently
attached to the primary (demotion candidate).
Addresses issue reported in GitHub #519.
Immediately after the demotion candidate (primary) has shut down, we can't
be absolutely sure that the walreceiver has flushed all WAL to disk, so
checking pg_last_wal_receive_lsn() at that point might not reflect
the actual last available WAL location.
To handle this, we'll loop for a while (timeout controlled by configuration
parameter "wal_receive_check_timeout") before finally deciding whether
the standby is still behind the shut-down primary.
Addresses issue raised in GitHub #518.
The initial implementation was designed to fall back to "manual"
start/stop of repmgrd if the "repmgrd_service_..._command" parameters
were not set.
However on reflection, this is too much of a potential footgun, so
we will mandate provision of these parameters.
repmgr will attempt to construct appropriate commands to start
and stop repmgrd, but usually it's preferable for them to be explicitly
defined, particularly if repmgr is installed from packages.
From the next major release, the current documentation will be located in the
"/docs/current/" subdirectory. This makes it easier to provide canonical
links to the latest version of the documentation (similar to how the
main PostgreSQL documentation is organised).
Once the following major release is available, the documentation will be moved
to a subdirectory with the version number, e.g. "/docs/4.3/".
The switchover will fail if the data_directory parameter in repmgr.conf
on the remote node (demotion candidate) is incorrectly configured.
We use the previously added "repmgr node check --data-directory-config
to verify this, and abort early if an issue is discovered.
Implements GitHub #523.
Previously, if connection URIs were in use and "repmgr standby switchover"
was executed, repmgr would pass the connection URI as-is to the demotion
candidate to execute "repmgr node rejoin". However the presence of
unescaped ampersands in the connection URI was causing the rejoin command
to be incorrectly executed.
Addresses GitHub #525.
This suppresses display of the usually lengthy "conninfo" column, mainly
useful for generating a compact table suitable for pasting into emails,
chats etc. without messy line breaks.
Implements GitHub #521.
