mike-tr-adamson commented on code in PR #2769:
URL: https://github.com/apache/cassandra/pull/2769#discussion_r1362440840


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src/java/org/apache/cassandra/index/sai/StorageAttachedIndexGroup.java:
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@@ -128,14 +130,13 @@ public void removeIndex(Index index)
             for (SSTableReader sstable : contextManager.sstables())
                 
sstable.unregisterComponents(IndexDescriptor.create(sstable).getLivePerSSTableComponents(),
 baseCfs.getTracker());
             deletePerSSTableFiles(baseCfs.getLiveSSTables());
-            baseCfs.getTracker().unsubscribe(this);
         }
     }
 
     @Override
     public void invalidate()
     {
-        // in case of dropping table, sstable contexts should already been 
removed by SSTableListChangedNotification.
+        // in case of removing last index from group, sstable contexts should 
already been removed by removeIndex

Review Comment:
   Hmm, there are a few comments floating around that I don't think are 
strictly correct. When you say "per-column index files are removed", do you 
mean when they are deleted? 
   
   Apart from index rebuilds and index corruption, the only time per-column 
index files are deleted is when their associated `SSTableIndex` is released and 
has been marked as obsolete. This happens when the `IndexViewManager` 
associated with an index (via the `IndexContext`) is invalidated. This happens 
as part of the index invalidate task which is called from `Keyspace.unloadCf` 
during drop table.



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