Hi,
I have tested pg_rewind (ver 9.5) with the following scenario:
- one master and one slave (total size of each server is more than 4GB)
- set wal_log_hint=on and restart both
- stop master, promote slave
- start old master again (now two servers have diverged)
- stop old master, run pg_rewind with progress option
The pg_rewind ran successfully but I saw it copied more than 4GB (4265891 kB copied). So I wonder there was very minor difference between two servesr but why did pg_rewind copy almost all data of new master?
Regards,
Hung Phan