## Cluster probe

### Cluster-writeable probe

The reply is '200 OK' if cluster has write quorum if not it returns '503 Service Unavailable'.

```
curl http://minio1:9001/minio/health/cluster
HTTP/1.1 503 Service Unavailable
Accept-Ranges: bytes
Content-Length: 0
Server: MinIO
Vary: Origin
X-Amz-Bucket-Region: us-east-1
X-Minio-Write-Quorum: 3
X-Amz-Request-Id: 16239D6AB80EBECF
X-Xss-Protection: 1; mode=block

	err = en.Append(0xa3, 0x66, 0x6c, 0x64)
	if err != nil {
		return
	}
	err = en.WriteBool(z.Failed)
	if err != nil {
		err = msgp.WrapError(err, "Failed")
		return
	}
	// write "lbkt"
	err = en.Append(0xa4, 0x6c, 0x62, 0x6b, 0x74)
	if err != nil {
		return
	}
	err = en.WriteString(z.Bucket)
	if err != nil {
		err = msgp.WrapError(err, "Bucket")
		return
	}
	// write "lobj"

		return "", "", false
	}
	return name[:i], name[i+1:], true
}

// Write writes to the current file in the tar archive.
// Write returns the error [ErrWriteTooLong] if more than
// Header.Size bytes are written after [Writer.WriteHeader].
//
// Calling Write on special types like [TypeLink], [TypeSymlink], [TypeChar],

	if lri, reply = l.lockMap[resource]; !reply {
		// No lock is held on the given name
		return true, nil
	}
	if isWriteLock(lri) {
		// A write-lock is held, cannot release a read lock
		return false, fmt.Errorf("RUnlock attempted on a write locked entity: %s", resource)
	}
	l.removeEntry(resource, args, &lri)
	return reply, nil
}

type lockStats struct {
	Total  int
	Writes int

 */

    public void write( int b ) throws IOException {
        tmp[0] = (byte)b;
        write( tmp, 0, 1 );
    }

/**
 * Writes b.length bytes from the specified byte array to this
 * file output stream.
 *
 * @throws IOException if a network error occurs
 */

    public void write( byte[] b ) throws IOException {
        write( b, 0, b.length );
    }

	lrwm := NewLRWMutex()

	// fmt.Println("Getting initial write lock")
	if !lrwm.GetLock(ctx, "", "", time.Second) {
		panic("Failed to acquire initial write lock")
	}

	go func() {
		time.Sleep(2 * time.Second)
		lrwm.Unlock()
		// fmt.Println("Initial write lock released, waiting...")
	}()

	// fmt.Println("Trying to acquire 2nd write lock, waiting...")
	locked = lrwm.GetLock(ctx, "", "", duration)

     * @param model The model to serialize, must not be {@code null}.
     * @throws IOException If the model could not be serialized.
     */
    void write(File output, Map<String, Object> options, Model model) throws IOException;

    /**
     * Writes the supplied model to the specified character writer. The writer will be automatically closed before the
     * method returns.

        for ( String dialect : this.dialects ) {
            bos.write(0x02);
            try {
                bos.write(Strings.getASCIIBytes(dialect));
            }
            catch ( IOException e ) {
                throw new RuntimeCIFSException(e);
            }
            bos.write(0x0);
        }

        System.arraycopy(bos.toByteArray(), 0, dst, dstIndex, bos.size());

	for i := 0; i < b.N; i++ {
		rb.Write(data)
	}
}

func BenchmarkRingBuffer_AsyncWrite(b *testing.B) {
	rb := New(1024)
	data := []byte(strings.Repeat("a", 512))
	buf := make([]byte, 512)

	go func() {
		for {
			rb.Write(data)
		}
	}()

	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		rb.Read(buf)
	}
}

func BenchmarkRingBuffer_AsyncWriteBlocking(b *testing.B) {
	const sz = 512

func (z AccElem) EncodeMsg(en *msgp.Writer) (err error) {
	// map header, size 3
	// write "Total"
	err = en.Append(0x83, 0xa5, 0x54, 0x6f, 0x74, 0x61, 0x6c)
	if err != nil {
		return
	}
	err = en.WriteInt64(z.Total)
	if err != nil {
		err = msgp.WrapError(err, "Total")
		return
	}
	// write "Size"
	err = en.Append(0xa4, 0x53, 0x69, 0x7a, 0x65)
	if err != nil {
		return
	}