Encoder now directly reads from the object stream. Using split.Stream() was causing lot of redundant memory operations.

pkg/donut/bucket.go

@@ -33,7 +33,6 @@ import (
 	"github.com/minio/minio/pkg/crypto/sha256"
 	"github.com/minio/minio/pkg/crypto/sha512"
 	"github.com/minio/minio/pkg/donut/disk"
-	"github.com/minio/minio/pkg/donut/split"
 	"github.com/minio/minio/pkg/iodine"
 )
 
@@ -237,7 +236,7 @@ func (b bucket) ReadObject(objectName string) (reader io.ReadCloser, size int64,
 }
 
 // WriteObject - write a new object into bucket
-func (b bucket) WriteObject(objectName string, objectData io.Reader, expectedMD5Sum string, metadata map[string]string, signature *Signature) (ObjectMetadata, error) {
+func (b bucket) WriteObject(objectName string, objectData io.Reader, size int64, expectedMD5Sum string, metadata map[string]string, signature *Signature) (ObjectMetadata, error) {
 	b.lock.Lock()
 	defer b.lock.Unlock()
 	if objectName == "" || objectData == nil {
@@ -272,7 +271,7 @@ func (b bucket) WriteObject(objectName string, objectData io.Reader, expectedMD5
 		}
 		mwriter := io.MultiWriter(sumMD5, sum256, sum512)
 		// write encoded data with k, m and writers
-		chunkCount, totalLength, err := b.writeObjectData(k, m, writers, objectData, mwriter)
+		chunkCount, totalLength, err := b.writeObjectData(k, m, writers, objectData, size, mwriter)
 		if err != nil {
 			CleanupWritersOnError(writers)
 			return ObjectMetadata{}, iodine.New(err, nil)
@@ -422,32 +421,40 @@ func (b bucket) getDataAndParity(totalWriters int) (k uint8, m uint8, err error)
 }
 
 // writeObjectData -
-func (b bucket) writeObjectData(k, m uint8, writers []io.WriteCloser, objectData io.Reader, writer io.Writer) (int, int, error) {
+func (b bucket) writeObjectData(k, m uint8, writers []io.WriteCloser, objectData io.Reader, size int64, writer io.Writer) (int, int, error) {
 	encoder, err := newEncoder(k, m, "Cauchy")
+	chunkSize := int64(10 * 1024 * 1024)
 	if err != nil {
 		return 0, 0, iodine.New(err, nil)
 	}
 	chunkCount := 0
 	totalLength := 0
-	for chunk := range split.Stream(objectData, 10*1024*1024) {
-		if chunk.Err != nil {
-			return 0, 0, iodine.New(err, nil)
+	remaining := size
+	for remaining > 0 {
+		readSize := chunkSize
+		if remaining < chunkSize {
+			readSize = remaining
 		}
-		totalLength = totalLength + len(chunk.Data)
-		encodedBlocks, err := encoder.Encode(chunk.Data)
+		remaining = remaining - readSize
+		totalLength = totalLength + int(readSize)
+		encodedBlocks, inputData, err := encoder.EncodeStream(objectData, readSize)
+		if err != nil {
+			return 0, 0, iodine.New(err, nil)
+		}
+		_, err = writer.Write(inputData)
 		if err != nil {
 			return 0, 0, iodine.New(err, nil)
 		}
-
-		writer.Write(chunk.Data)
 		for blockIndex, block := range encodedBlocks {
 			errCh := make(chan error, 1)
 			go func(writer io.Writer, reader io.Reader) {
+				// FIXME: this closes the errCh in the outer scope
 				defer close(errCh)
-				_, err := io.Copy(writers[blockIndex], bytes.NewReader(block))
+				_, err := io.Copy(writer, reader)
 				errCh <- err
 			}(writers[blockIndex], bytes.NewReader(block))
 			if err := <-errCh; err != nil {
+				// FIXME: fix premature return in case of err != nil
 				return 0, 0, iodine.New(err, nil)
 			}
 		}

pkg/donut/donut-v1.go

@@ -134,7 +134,7 @@ func (donut API) listObjects(bucket, prefix, marker, delimiter string, maxkeys i
 }
 
 // putObject - put object
-func (donut API) putObject(bucket, object, expectedMD5Sum string, reader io.Reader, metadata map[string]string, signature *Signature) (ObjectMetadata, error) {
+func (donut API) putObject(bucket, object, expectedMD5Sum string, reader io.Reader, size int64, metadata map[string]string, signature *Signature) (ObjectMetadata, error) {
 	errParams := map[string]string{
 		"bucket": bucket,
 		"object": object,
@@ -158,7 +158,7 @@ func (donut API) putObject(bucket, object, expectedMD5Sum string, reader io.Read
 	if _, ok := bucketMeta.Buckets[bucket].BucketObjects[object]; ok {
 		return ObjectMetadata{}, iodine.New(ObjectExists{Object: object}, errParams)
 	}
-	objMetadata, err := donut.buckets[bucket].WriteObject(object, reader, expectedMD5Sum, metadata, signature)
+	objMetadata, err := donut.buckets[bucket].WriteObject(object, reader, size, expectedMD5Sum, metadata, signature)
 	if err != nil {
 		return ObjectMetadata{}, iodine.New(err, errParams)
 	}
@@ -170,7 +170,7 @@ func (donut API) putObject(bucket, object, expectedMD5Sum string, reader io.Read
 }
 
 // putObject - put object
-func (donut API) putObjectPart(bucket, object, expectedMD5Sum, uploadID string, partID int, reader io.Reader, metadata map[string]string, signature *Signature) (PartMetadata, error) {
+func (donut API) putObjectPart(bucket, object, expectedMD5Sum, uploadID string, partID int, reader io.Reader, size int64, metadata map[string]string, signature *Signature) (PartMetadata, error) {
 	errParams := map[string]string{
 		"bucket": bucket,
 		"object": object,
@@ -198,7 +198,7 @@ func (donut API) putObjectPart(bucket, object, expectedMD5Sum, uploadID string,
 		return PartMetadata{}, iodine.New(ObjectExists{Object: object}, errParams)
 	}
 	objectPart := object + "/" + "multipart" + "/" + strconv.Itoa(partID)
-	objmetadata, err := donut.buckets[bucket].WriteObject(objectPart, reader, expectedMD5Sum, metadata, signature)
+	objmetadata, err := donut.buckets[bucket].WriteObject(objectPart, reader, size, expectedMD5Sum, metadata, signature)
 	if err != nil {
 		return PartMetadata{}, iodine.New(err, errParams)
 	}

pkg/donut/donut-v2.go

@@ -373,6 +373,7 @@ func (donut API) createObject(bucket, key, contentType, expectedMD5Sum string, s
 			key,
 			expectedMD5Sum,
 			data,
+			size,
 			map[string]string{
 				"contentType":   contentType,
 				"contentLength": strconv.FormatInt(size, 10),

pkg/donut/encoder.go

@@ -17,6 +17,7 @@
 package donut
 
 import (
+	"io"
 	"strconv"
 
 	encoding "github.com/minio/minio/pkg/erasure"
@@ -86,6 +87,14 @@ func (e encoder) Encode(data []byte) (encodedData [][]byte, err error) {
 	return encodedData, nil
 }
 
+func (e encoder) EncodeStream(data io.Reader, size int64) (encodedData [][]byte, inputData []byte, err error) {
+	encodedData, inputData, err = e.encoder.EncodeStream(data, size)
+	if err != nil {
+		return nil, nil, iodine.New(err, nil)
+	}
+	return encodedData, inputData, nil
+}
+
 // Decode - erasure decode input encoded bytes
 func (e encoder) Decode(encodedData [][]byte, dataLength int) (data []byte, err error) {
 	decodedData, err := e.encoder.Decode(encodedData, dataLength)

pkg/donut/multipart.go

@@ -155,7 +155,7 @@ func (donut API) createObjectPart(bucket, key, uploadID string, partID int, cont
 			}
 			expectedMD5Sum = hex.EncodeToString(expectedMD5SumBytes)
 		}
-		partMetadata, err := donut.putObjectPart(bucket, key, expectedMD5Sum, uploadID, partID, data, metadata, signature)
+		partMetadata, err := donut.putObjectPart(bucket, key, expectedMD5Sum, uploadID, partID, data, size, metadata, signature)
 		if err != nil {
 			return "", iodine.New(err, nil)
 		}

pkg/erasure/erasure_encode.go

@@ -23,6 +23,7 @@ package erasure
 import "C"
 import (
 	"errors"
+	"io"
 	"unsafe"
 )
 
@@ -195,3 +196,47 @@ func (e *Erasure) Encode(inputData []byte) (encodedBlocks [][]byte, err error) {
 
 	return encodedBlocks, nil
 }
+
+// EncodeStream erasure codes a block of data in "k" data blocks and "m" parity blocks.
+// Output is [k+m][]blocks of data and parity slices.
+func (e *Erasure) EncodeStream(data io.Reader, size int64) ([][]byte, []byte, error) {
+	k := int(e.params.K) // "k" data blocks
+	m := int(e.params.M) // "m" parity blocks
+	n := k + m           // "n" total encoded blocks
+
+	// Length of a single encoded chunk.
+	// Total number of encoded chunks = "k" data  + "m" parity blocks
+	encodedBlockLen := GetEncodedBlockLen(int(size), uint8(k))
+
+	// Length of total number of "n" data chunks
+	encodedDataBlocksLen := encodedBlockLen * n
+
+	inputData := make([]byte, size, encodedDataBlocksLen)
+
+	_, err := io.ReadFull(data, inputData)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	// Allocate memory to the "encoded blocks" return buffer
+	encodedBlocks := make([][]byte, n) // Return buffer
+
+	// Nessary to bridge Go to the C world. C requires 2D arry of pointers to
+	// byte array. "encodedBlocks" is a 2D slice.
+	pointersToEncodedBlock := make([]*byte, n) // Pointers to encoded blocks.
+
+	// Copy data block slices to encoded block buffer
+	for i := 0; i < n; i++ {
+		encodedBlocks[i] = inputData[i*encodedBlockLen : (i+1)*encodedBlockLen]
+		pointersToEncodedBlock[i] = &encodedBlocks[i][0]
+	}
+
+	// Erasure code the data into K data blocks and M parity
+	// blocks. Only the parity blocks are filled. Data blocks remain
+	// intact.
+	C.ec_encode_data(C.int(encodedBlockLen), C.int(k), C.int(m), e.encodeTbls,
+		(**C.uchar)(unsafe.Pointer(&pointersToEncodedBlock[:k][0])), // Pointers to data blocks
+		(**C.uchar)(unsafe.Pointer(&pointersToEncodedBlock[k:][0]))) // Pointers to parity blocks
+
+	return encodedBlocks, inputData[0:size], nil
+}