maedhroz commented on code in PR #4428:
URL: https://github.com/apache/cassandra/pull/4428#discussion_r2535178906


##########
src/java/org/apache/cassandra/db/lifecycle/Tracker.java:
##########
@@ -270,6 +272,20 @@ public void 
updateInitialSSTableSize(Iterable<SSTableReader> sstables)
 
     public void addSSTables(Collection<SSTableReader> sstables)
     {
+        
Preconditions.checkState(!cfstore.metadata().replicationType().isTracked());
+        addSSTablesInternal(sstables, false, true, true);
+    }
+
+    public void addSSTablesTracked(Collection<SSTableReader> sstables)
+    {
+        
Preconditions.checkState(cfstore.metadata().replicationType().isTracked());
+        for (SSTableReader sstable : sstables)
+        {
+            ImmutableCoordinatorLogOffsets logOffsets = 
sstable.getCoordinatorLogOffsets();
+            Preconditions.checkState(logOffsets.mutations().isEmpty());
+            Preconditions.checkState(!logOffsets.transfers().isEmpty());

Review Comment:
   Couple thoughts:
   
   1.) Would `ImmutableCoordinatorLogOffsets` benefit from a method like 
`isTransfer()` that we could use here? ^
   2.) I'd consider actual error messages here (especially after collapsing the 
two checks above with `isTransfer()`), although if we used assertions 
correctly, those would be better (given this is a programmer error if it 
happens).



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