WALEdit add(ExtendedCell cell) {
    // We clone Family each time we add a Cell. Expensive but safe. For CPU savings, use
    // add(Map) or add(Cell, family).
    return add(cell, CellUtil.cloneFamily(cell));
  }
@return True when current WALEdit is created by log replay. Replication skips WALEdits from
        replay.
hbase-server/src/main/java/org/apache/hadoop/hbase/wal/WALEdit.java