Ian Barwick 44a39760a1 standby clone: improve source node replication connection check ...

Previously, the check was attempting to make replication connections
to the source node, and if these were failing, inferring that
insufficient walsenders were available.

However it's quite likely that the connections are refused due to
insufficient user connection permissions. So before performing
the connection check, query the number of potentially available
walsenders on the source node and compare it with the number
required (either 1 or 2) - if insufficient, exit with error and
hint about increasing "max_wal_senders".

Once we've established sufficient walsenders are available, inability
to connect is most likely related to permissions issues on the source
node.

2019-05-28 00:11:53 +09:00

211 KiB

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