@Override
  public String toString() {
    return "done=" + isDone() + ", txid=" + this.txid + " threadID=" + t.getId() + " threadName="
      + t.getName();
  }
Call this method to clear old usage and get it ready for new deploy.
@param txid the new transaction id
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/wal/SyncFuture.java