aratno commented on code in PR #4118:
URL: https://github.com/apache/cassandra/pull/4118#discussion_r2067067477


##########
src/java/org/apache/cassandra/io/sstable/metadata/MetadataCollector.java:
##########
@@ -100,6 +92,7 @@ public static StatsMetadata defaultStatsMetadata()
                                  null,
                                  false,
                                  true,
+                                 MutationIdRanges.NONE,

Review Comment:
   Thought about this some more - I think we should not tolerate missing 
StatsMetadata files anymore and log a warning. This tolerance was added ~12 
years ago for the 2.1 beta when StatsMetadata was introduced, but every 
supported upgrade path now should have StatsMetadata already present.
   
   For CASSANDRA-20381, we could refuse to mark SSTables as reconciled if they 
are for tracked keyspaces and have MutationIdRanges.NONE, since presumably 
these SSTables existed before a migration to mutation tracking, and the 
migration path should probably do an IR and mark SSTables as repaired.



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