Hi @szamasz, in the case of the 5.9 to 5.11 upgrade you do not see it, because there is no NameNode metadata format change, so there is no need to keep the previous format metadata around (both of those are on HDFS 2.6.0). If you want to see the change you can see it between 5.3 and 5.4 or upgrading to 6.x from 5.x.   The NameNode UI will give you a warning anyway if you have unfinalized metadata changes. If you do not see that you are in the clear. I have just upgraded a cluster from 5.3 to 5.13 and have not finalized the upgrade, can take you a screenshot tomorrow. 🙂 ... View more