protected int compareFamilies(ByteBufferKeyValue left, int leftFamilyPosition,
    int leftFamilyLength, ByteBufferKeyValue right, int rightFamilyPosition,
    int rightFamilyLength) {
    return ByteBufferUtils.compareTo(left.getFamilyByteBuffer(), leftFamilyPosition,
      leftFamilyLength, right.getFamilyByteBuffer(), rightFamilyPosition, rightFamilyLength);
  }
This method will be overridden when we compare cells inner store to bypass family comparing.
hbase-common/src/main/java/org/apache/hadoop/hbase/CellComparatorImpl.java