code: void init()
      {
          view.set(new View(
                           ImmutableList.of(new Memtable(cfstore)),
                           ImmutableList.<Memtable>of(),
                           Collections.<SSTableReader, SSTableReader>emptyMap(),
                           Collections.<SSTableReader>emptySet(),
                           Collections.<SSTableReader>emptySet(),
                           SSTableIntervalTree.empty()));
      }
docs: (Re)initializes the tracker, purging all references.