dlmarion commented on issue #5347:
URL: https://github.com/apache/accumulo/issues/5347#issuecomment-2679127003

   I think the issue here is the way that the upgrade is performed tracked when 
upgrading through multiple versions. If, for example, you are upgrading from 
version `A` to version `C`, then the Manager upgrades ZooKeeper to versions `B` 
and `C`. Then the Manager will upgrade the root and metadata tables to versions 
`B` and `C`.  When this process is complete, then the version in ZooKeeper is 
updated from `A` to `C`. If there is an exception along the way, then I think 
the following states are possible:
   
   ZooKeeper|Root|Metadata
   --- | --- | ---
   A | A | A
   B | A | A
   C | A| A
   C | B | A
   C | C| A
   C | C | B
   
   Because the versions of ZooKeeper, Root, and Metadata are not maintained 
separately, the upgrade has to start from the beginning, instead of picking up 
where it left off.
   
   


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