Alexander Kukushkin b901e62ad0 Enhanced checks of replica logical slots safety (#2285) ...

The logical slot on a replica is safe to use when the physical replica
slot on the primary:
1. has a nonzero/non-null `catalog_xmin`
2. has a `catalog_xmin` that is not newer (greater) than the  `catalog_xmin` of any slot on the standby
3. the `catalog_xmin` is known to overtake `catalog_xmin` of logical slots on the primary observed during `1`

In case if `1` doesn't take place, Patroni will run an additional check whether the `hot_standby_feedback` is actually in effect and shows the warning in case it is not.

2022-05-10 12:24:47 +02:00

9.1 KiB

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