### 2. Run MinIO in federated mode

Bucket lookup from DNS federation requires two dependencies

- etcd (for bucket DNS service records)
- CoreDNS (for DNS management based on populated bucket DNS service records, optional)

## Architecture

![bucket-lookup](https://github.com/minio/minio/blob/master/docs/federation/lookup/bucket-lookup.png?raw=true)

### Environment variables

  /** We will keep a private list of all logged records */
  @GuardedBy("lock")
  private final List<LogRecord> list = new ArrayList<>();

  /** Adds the most recently logged record to our list. */
  @Override
  public void publish(@Nullable LogRecord record) {
    synchronized (lock) {
      if (record != null) {
        list.add(record);
      }
    }
  }

  @Override
  public void flush() {}

    }

    /**
     * Gets the total number of records matching the search query.
     *
     * @return The total record count
     */
    public long getAllRecordCount() {
        return allRecordCount;
    }

    /**
     * Gets the relation type for the record count (e.g., "eq", "gte").
     *
     * @return The record count relation
     */
    public String getAllRecordCountRelation() {

        crawlingInfoBhv.insertOrUpdate(crawlingInfo, op -> op.setRefreshPolicy(Constants.TRUE));

    }

    /**
     * Deletes a crawling information record and all its associated parameters.
     * First deletes all related CrawlingInfoParam records, then deletes the main record
     * with immediate refresh to ensure consistency.
     *
     * @param crawlingInfo the crawling information entity to delete
     */

	dst   chan [][]string // result of block decode
	err   error           // any error encountered will be set here
}

// Read - reads single record.
// Once Read is called the previous record should no longer be referenced.
func (r *Reader) Read(dst sql.Record) (sql.Record, error) {
	// If we have have any records left, return these before any error.
	for len(r.current) <= r.recordsRead {
		if r.err != nil {
			return nil, r.err
		}

  private val _failedRoutes = mutableSetOf<Route>()

  val failedRoutes: Set<Route>
    @Synchronized get() = _failedRoutes.toSet()

  /** Records a failure connecting to [failedRoute]. */
  @Synchronized fun failed(failedRoute: Route) {
    _failedRoutes.add(failedRoute)
  }

  /** Records success connecting to [route]. */
  @Synchronized fun connected(route: Route) {
    _failedRoutes.remove(route)
  }

        return 1;
    }

    /**
     * Gets the total number of records.
     * @return the total record count
     */
    public int getAllRecordCount() {
        return allRecordCount;
    }

    /**
     * Sets the total number of records.
     * @param allRecordCount the total record count
     */
    public void setAllRecordCount(final int allRecordCount) {

			errorResponse: APIErrorResponse{
				Resource: SlashSeparator + bucketName + SlashSeparator,
				Code:     "InvalidAccessKeyId",
				Message:  "The Access Key Id you provided does not exist in our records.",
			},
			shouldPass: false,
		},
		// PUT empty credentials
		{
			method:             http.MethodPut,
			bucketName:         bucketName,
			accessKey:          "",
			secretKey:          "",

        versionNo = null;

    }

    /**
     * Gets the total number of records.
     * @return The total record count.
     */
    public int getAllRecordCount() {
        return allRecordCount;
    }

    /**
     * Sets the total number of records.
     * @param allRecordCount The total record count.
     */
    public void setAllRecordCount(final int allRecordCount) {

		b.uint32(1)           // total number of disks

		if _, err := w.cw.Write(buf[:]); err != nil {
			return err
		}

		// store max values in the regular end record to signal
		// that the zip64 values should be used instead
		records = uint16max
		size = uint32max
		offset = uint32max
	}

	// write end record
	var buf [directoryEndLen]byte