hbase memstore

long (final KeyValue kv) {
  KeyValue toAdd = maybeCloneWithAllocator(kv);
  return internalAdd(toAdd);
}
private long internalAdd(final KeyValue toAdd) {
  long s = heapSizeChange(toAdd, addToKVSet(toAdd));
  timeRangeTracker.includeTimestamp(toAdd);
  this.size.addAndGet(s);
  return s;
}
private boolean addToKVSet(KeyValue e) {
  boolean b = this.kvset.add(e);
  setOldestEditTimeToNow();
  return b;
}