As of PostgreSQL commit d9dd406f, variable length arrays are no longer
permitted. As they're not actually required anyway, just define appropriate
constants.
Also noted in GitHub #510.
The connections used to check repmgrd status on all nodes were not being
closed if repmgrd was not running. Normally this wouldn't be a huge
problem as they will go away when repmgr terminates or the PostgreSQL
server restarted. However, if shutdown mode is "smart", the open
connection on the demotion candidate will cause the shutdown operation
to fail until repmgr times out.
If the upstream comes back on line (e.g. after a switchover), and its
status is no longer primary, restart monitoring to ensure the correct
primary (potentially the current node) is being monitored.
While scanning for a new primary following a promotion script failure,
repmgrd was treating a witness server as a potential new primary
and would attempt to "follow" it. Fortunately "repmgr standby follow"
would do the right thing and choose the actual primary, if available,
otherwise do nothing, so the cluster would eventually end up in the
correct state, albeit for the wrong reason.
By skipping the witness server as a potential new primary,
repmgrd will do the right thing if the original primary does come
back online, i.e. resume monitoring as before.
The getopt API doesn't cope well with optional arguments to short form options,
e.g. "-o foo", so we need to check the next argument value to see whether it looks
like an option or an actual argument value.
Previously repmgr would abort with an unhelpful message about being
unable to parse CSV output.
With this commit, it will continue running, and display a list of
inaccessible nodes as an addendum to the main output (unless --csv
or --terse options are specified).
Addresses GitHub #246.
Also we can now simplify "cluster (matrix|crosscheck)" commands as
beginning with v4.0, we know where the configuration file is, so can
provide that when invoking repmgr remotely.
This is to facilitate remote invocation of repmgr when the repmgr
binary is located somewhere other than the PostgreSQL binary directory, as it
cannot be assumed all package maintainers will install repmgr there.
This parameter is optional; if not set (the default), repmgr will fall back
to "pg_bindir" (if set).
Addresses GitHub #246.
Ian Barwick