@Override
  public String toString() {
    return "RequestInfo{" + "host='" + host + '\'' + ", port=" + port + ", request=" + request + ", replicaId="
        + replicaId + '}';
  }
@return {@code True} if request has been received by network layer.
ambry-api/src/main/java/com/github/ambry/network/RequestInfo.java