Re: [PR] HDDS-16012. Detect replicas with equal BCSID and mismatched data checksums [ozone]

["F64116045 (via GitHub)" <gi...@apache.org>]

F64116045 commented on PR #11199:
URL: https://github.com/apache/ozone/pull/11199#issuecomment-6040587684

   Thinking about this some more, if we want checksum mismatch to remain visible while other issues are being repaired, the main problem is that representing every overlap with combined states does not scale well.
   
   My thought for the longer term is to separate the primary state RM acts on from the other issues found during the scan. RM would still act on one state, while the report could keep all detected issues.
   But I think this would require a larger change to the health model, so I would leave it outside this PR.
   
    For now, I would like to propose:
   
   - Treat checksum mismatch like the other container health states.
   - Keep one primary health state per container.
   - Give repairable replication problems priority. Because RM only acts on the primary state, so letting checksum mismatch take priority could prevent an under-replicated or over-replicated container from being repaired.
   - Report `DATA_CHECKSUM_MISMATCH` in a later scan after the replication problem is resolved.
   
   For scope:
   
   - Keep this PR focused on checksum mismatch detection and reporting in RM.
   - Move the RPC and `ozone admin container info` changes to a follow-up.
   - Move the Recon changes to another follow-up.
   
   @sodonnel @devmadhuu if you have time, I’d appreciate any thoughts on this direction. Thanks again for the earlier discussion.


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