This was already done before (I started HDF upgrade), so I went to the next section.
But now already it came to me, that I might have done a mistake, that in that HDP Upgrade, I did *not* care about already providing the right (also upgraded) HDF Repo URLs (instead I had kept the HDF to current v3.2.0)
* "Upgrade HDF services"
Step 3): >Use hdf-select to ensure appropriate links to new installed version.
Now this doesn't work (no wonder no new HDF/NiFi rpms not installed yet).
Also "hdf-select versions" only shows the current HDF 3.2.0
Add. notes: After I restarted Ambari, I noted that the Nifi+registry services completely disappeared from the Ambari View (also found some warnings in ambari-server log).
To fix that situation, I had to un-install the (upgraded) hdf mpack, and re-install the HDF-3.2.0 mpack and again restart ambari, then those HDF services were back.
And as I understood later, the problem was upgrading only the mpack without that the new HDF(3.3) repo and rpms were installed (due to my omission of the HDF repo upgrade..)