code: private void replaceReaders(Collection<SSTableReader> oldSSTables, Collection<SSTableReader> newSSTables, boolean notify)
      {
          View currentView, newView;
          do
          {
              currentView = view.get();
              newView = currentView.replace(oldSSTables, newSSTables);
          }
          while (!view.compareAndSet(currentView, newView));
  
          if (!oldSSTables.isEmpty() && notify)
              notifySSTablesChanged(oldSSTables, newSSTables, OperationType.UNKNOWN);
  
          for (SSTableReader sstable : newSSTables)
              sstable.setTrackedBy(this);
  
          Refs.release(Refs.selfRefs(oldSSTables));
      }
docs: A special kind of replacement for SSTableReaders that were cloned with a new index summary sampling level (see
  SSTableReader.cloneWithNewSummarySamplingLevel and CASSANDRA-5519).  This does not mark the old reader
  as compacted.
  @param oldSSTables replaced readers
  @param newSSTables replacement readers