public boolean isMetaEdit() {
    return this.families != null && this.families.size() == 1 && this.families.contains(METAFAMILY);
  }
@return True if this is a meta edit; has one edit only and its columnfamily is
        {@link #METAFAMILY}.
hbase-server/src/main/java/org/apache/hadoop/hbase/wal/WALEdit.java