Previously the assumption was that the "repmgr" replication set would be
set up when the nodes are created, however no checks were implemented
and this was not well-documented.
Addresses GitHub #347.
This previously happened in the extension SQL code, which could
potentially cause replay problems if installing on a BDR cluster.
As this table is only required for streaming replication failover,
move the initialisation to "repmgr primary register".
Addresses GitHub #344 .
This bug was not detected before because most users work with the repmgr
user. For that reason, the repmgr schema is already in the search_path
by default.
Add the repmgr schema to the nodes table in the LEFT JOIN used for
cluster show (and in other places)
Signed-off-by: Martín Marqués <martin.marques@2ndquadrant.com>
The string in question will be generated internally by repmgr as a simple
one-line string with no control characters etc., so all that needs to be
escaped at the moment are any double quotes.
get_new_primary() returns NULL if no notification for the new primary has
been received, but the code was expecting it to return UNKNOWN_NODE_ID,
which was causing repmgrd to prematurely drop out of the new primary
detection loop if no notification had been received by the time the loop
started.
Also store the electoral term as a single row, single column table,
to ensure that all repmgrds see the same turn. It is then bumped
by the winning node after it gets promoted.
Various logging improvements.
Previously repmgr would write all the default libpq parameters
into "primary_conninfo" on "standby clone", but not for
"standby follow", which is inconsistent.
For repmgr4 we'll determine that the upstream node's conninfo
must be canonical and contain all required connection parameters,
even if these are available as defaults or environment variables
in the local environment, as those are transient and may not
be available in all environments/situations.
recovery.conf's "primary_conninfo" will be generated using the
upstream's conninfo parameters, except for those specific
to the downstream node. These are:
- "application_name": this will always be set to the
"node_name" of the downstream node
- "passfile" and "servicefile": these, must of course
reference files on the downstream node so will be extracted
from the downstream node's conninfo, if set
When executing repmgr on remote nodes, we otherwise end up jumping
through hoops as we can't make assumptions about where the configuration
file is located, but really need to be able to provide it.
From a support point of view it will also make life easier as it will
be easy to specify exactly which file to provide.
If the current primary (demotion candidate) still has any files to archive,
it will delay the shutdown until all files are archived. If there is a
substantial number of files, and/or the archive command executes slowly,
this will probably lead to an unwelcome delay in the switchover process.
