It's possible you have wal_keep_segments set too low. What happens is that the master will keep the wals ( in your case 20) after processing them, before sending them off to the great black hole in the network (deleting) and making them unavailable to the standby. Try increasing wal_keep_segments = 100.
Increased thewal_keep_segments=100andkeeps popping upthe same message:
The message did not come through. Also increasing wal_keep_segments only works for the future, it will not deal with a WAL file that has already been recycled before the setting was changed.
A question thatI have! astheslave servercan seethis folderin themaster? /mnt/server/archivedir/
So have you tried logging into the standby and then accessing the directory on the master manually. In other words copy a file from the master to standby using cp from the standby command line.
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