[pgpool-general: 8847] pgpool_remote_start won't start pgpool at all

[Zhaoxun Yan]

Hi guys!

I am confused about the procedures to recover a node.

https://www.pgpool.net/docs/latest/en/html/runtime-online-recovery.html

It is triggered by manually sending `pcp_recovery` on the  current master
server to the current master pgpool. I totally understand that the first
stage is to evoke the postgres replication process to copy data from the
current master to the new replica.

But here are 2 questions:

1) Since the 2nd step requires there is no real client (aside from other
pgpool's  healthcheck ones) , is it possible to start the 2nd stage?
especially for snapshot mode

*Note: * There is a restriction in the online recovery in native
replication mode
<https://www.pgpool.net/docs/latest/en/html/runtime-config-running-mode.html#GUC-REPLICATION-MODE>.
If Pgpool-II itself is installed on multiple hosts, online recovery does
not work correctly, because Pgpool-II has to stop all the clients during
the 2nd stage of online recovery. If there are several Pgpool-II hosts,
only one of them will have received the online recovery command and will
block the connections from clients.

2) After the 2nd stage, pgpool goes to pgpool_remote_start scripts to
finish the recovery procedures. But pgpool_remote_start only starts the
postgres on the replica server, while it does not do anything to the pgpool
on that server at all.

How to start the pgpool server? Just start it or take some registration
procedure to let the master pgpool welcome it into the whole pgpools'
cluster?

Thanks in advance,
  Zhaoxun
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