@Override
  public String toString() {
    return "CatchupStatusAdminRequest[ClientId=" + clientId + ", CorrelationId=" + correlationId
        + ", AcceptableLagInBytes=" + acceptableLagInBytes + ", PartitionId=" + getPartitionId() + "]";
  }
@return the least number of replicas that have to be within {@link #getAcceptableLagInBytes()} for each partition.
ambry-protocol/src/main/java/com/github/ambry/protocol/CatchupStatusAdminRequest.java