ColumnFamilyStore cfs = Keyspace.open(sstable.getKeyspaceName()).getColumnFamilyStore(sstable.getColumnFamilyName()); DataTracker tracker = cfs.getDataTracker(); SSTableReader replacement = sstable.cloneWithNewSummarySamplingLevel(cfs, entry.newSamplingLevel); newSSTables.add(replacement); replacedByTracker.put(tracker, sstable);