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cluster show/daemon status: report upstream node mismatches

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When showing node information, check if the node's copy of its
record shows a different upstream to the one expected according
to the node where the command is executed.

This helps visualise situations where the cluster is in an
unexpected state, and provide a better idea of the actual state.

For example, if a cluster has divided somehow and a set of nodes are
following a new primary, when running "cluster show" etc., repmgr
will now show the name of the primary those nodes are actually
following, rather than the now outdated node name recorded
on the other side of the split. A warning will also be issued
about the situation.
This commit is contained in:
Ian Barwick
2019-05-14 12:58:18 +09:00
parent ae44012383
commit fca033fb9d
6 changed files with 121 additions and 40 deletions
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@@ -4,6 +4,8 @@
repmgr: add "--repmgrd-force-unpause" option to "standby switchover" (Ian)
repmgr: improve "--dry-run" behaviour for "standby promote" and
"standby switchover" (Ian)
repmgr: in "cluster show" and "daemon status", show upstream node name
as reported by each individual node (Ian)
repmgrd: monitor standbys attached to primary (Ian)
general: documentation converted to DocBook XML format (Ian)