@Override
  public long getOrigLogSeqNum() {
    return this.origLogSeqNum;
  }
Return a positive long if current WALKeyImpl is created from a replay edit; a replay edit is an
edit that came in when replaying WALs of a crashed server.
@return original sequence number of the WALEdit
hbase-server/src/main/java/org/apache/hadoop/hbase/wal/WALKeyImpl.java