Hi, we have a doubt interpreting documentation. We have a 9.6 installation master+stand-by in streaming replication. Master database is in archive mode and WAL archive destination (NFS) is mounted in both master and stand-by servers.
The question is regarding this part of documentation: (https://www.postgresql.org/docs/9.6/warm-standby.html)
If you use streaming replication without file-based continuous archiving, the server might recycle old WAL segments before the standby has received them. If this occurs, the standby will need to be reinitialized from a new base backup. You can avoid this by setting wal_keep_segments to a value large enough to ensure that WAL segments are not recycled too early, or by configuring a replication slot for the standby. If you set up a WAL archive that's accessible from the standby, these solutions are not required, since the standby can always use the archive to catch up provided it retains enough segments.
if the master overwrite the wal BEFORE they are sent to the standby via replication, does the standby automatically start looking in WAL archive destination? Or this step have to be made by hand?