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Merge pull request #691 from harshavardhana/pr_out_handle_couple_of_cases_of_oom_conditions_move_caching_to_getobject_rather_than_putobject_

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Handle couple of cases of OOM conditions, move caching to GetObject() rather than PutObject()
This commit is contained in:
Harshavardhana 2015-06-29 19:33:55 +00:00
commit b5a5861c8f
3 changed files with 51 additions and 53 deletions
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51
pkg/storage/donut/bucket.go
View File

@ -212,7 +212,7 @@ func (b bucket) ReadObject(objectName string) (reader io.ReadCloser, size int64,
return nil, 0, iodine.New(err, nil)
}
// read and reply back to GetObject() request in a go-routine
go b.readEncodedData(normalizeObjectName(objectName), writer, objMetadata)
go b.readObjectData(normalizeObjectName(objectName), writer, objMetadata)
return reader, objMetadata.Size, nil
}
@ -223,7 +223,7 @@ func (b bucket) WriteObject(objectName string, objectData io.Reader, expectedMD5
if objectName == "" || objectData == nil {
return ObjectMetadata{}, iodine.New(InvalidArgument{}, nil)
}
writers, err := b.getDiskWriters(normalizeObjectName(objectName), "data")
writers, err := b.getWriters(normalizeObjectName(objectName), "data")
if err != nil {
return ObjectMetadata{}, iodine.New(err, nil)
}
@ -247,8 +247,8 @@ func (b bucket) WriteObject(objectName string, objectData io.Reader, expectedMD5
if err != nil {
return ObjectMetadata{}, iodine.New(err, nil)
}
// encoded data with k, m and write
chunkCount, totalLength, err := b.writeEncodedData(k, m, writers, objectData, sumMD5, sum512)
// write encoded data with k, m and writers
chunkCount, totalLength, err := b.writeObjectData(k, m, writers, objectData, sumMD5, sum512)
if err != nil {
return ObjectMetadata{}, iodine.New(err, nil)
}
@ -310,7 +310,7 @@ func (b bucket) writeObjectMetadata(objectName string, objMetadata ObjectMetadat
if objMetadata.Object == "" {
return iodine.New(InvalidArgument{}, nil)
}
objMetadataWriters, err := b.getDiskWriters(objectName, objectMetadataConfig)
objMetadataWriters, err := b.getWriters(objectName, objectMetadataConfig)
if err != nil {
return iodine.New(err, nil)
}
@ -332,7 +332,7 @@ func (b bucket) readObjectMetadata(objectName string) (ObjectMetadata, error) {
if objectName == "" {
return ObjectMetadata{}, iodine.New(InvalidArgument{}, nil)
}
objMetadataReaders, err := b.getDiskReaders(objectName, objectMetadataConfig)
objMetadataReaders, err := b.getReaders(objectName, objectMetadataConfig)
if err != nil {
return ObjectMetadata{}, iodine.New(err, nil)
}
@ -378,8 +378,8 @@ func (b bucket) getDataAndParity(totalWriters int) (k uint8, m uint8, err error)
return k, m, nil
}
// writeEncodedData -
func (b bucket) writeEncodedData(k, m uint8, writers []io.WriteCloser, objectData io.Reader, sumMD5, sum512 hash.Hash) (int, int, error) {
// writeObjectData -
func (b bucket) writeObjectData(k, m uint8, writers []io.WriteCloser, objectData io.Reader, sumMD5, sum512 hash.Hash) (int, int, error) {
encoder, err := newEncoder(k, m, "Cauchy")
if err != nil {
return 0, 0, iodine.New(err, nil)
@ -387,16 +387,17 @@ func (b bucket) writeEncodedData(k, m uint8, writers []io.WriteCloser, objectDat
chunkCount := 0
totalLength := 0
for chunk := range split.Stream(objectData, 10*1024*1024) {
if chunk.Err == nil {
totalLength = totalLength + len(chunk.Data)
encodedBlocks, _ := encoder.Encode(chunk.Data)
sumMD5.Write(chunk.Data)
sum512.Write(chunk.Data)
for blockIndex, block := range encodedBlocks {
_, err := io.Copy(writers[blockIndex], bytes.NewBuffer(block))
if err != nil {
return 0, 0, iodine.New(err, nil)
}
if chunk.Err != nil {
return 0, 0, iodine.New(err, nil)
}
totalLength = totalLength + len(chunk.Data)
encodedBlocks, _ := encoder.Encode(chunk.Data)
sumMD5.Write(chunk.Data)
sum512.Write(chunk.Data)
for blockIndex, block := range encodedBlocks {
_, err := io.Copy(writers[blockIndex], bytes.NewBuffer(block))
if err != nil {
return 0, 0, iodine.New(err, nil)
}
}
chunkCount = chunkCount + 1
@ -404,9 +405,9 @@ func (b bucket) writeEncodedData(k, m uint8, writers []io.WriteCloser, objectDat
return chunkCount, totalLength, nil
}
// readEncodedData -
func (b bucket) readEncodedData(objectName string, writer *io.PipeWriter, objMetadata ObjectMetadata) {
readers, err := b.getDiskReaders(objectName, "data")
// readObjectData -
func (b bucket) readObjectData(objectName string, writer *io.PipeWriter, objMetadata ObjectMetadata) {
readers, err := b.getReaders(objectName, "data")
if err != nil {
writer.CloseWithError(iodine.New(err, nil))
return
@ -490,8 +491,8 @@ func (b bucket) decodeEncodedData(totalLeft, blockSize int64, readers []io.ReadC
return decodedData, nil
}
// getDiskReaders -
func (b bucket) getDiskReaders(objectName, objectMeta string) ([]io.ReadCloser, error) {
// getReaders -
func (b bucket) getReaders(objectName, objectMeta string) ([]io.ReadCloser, error) {
var readers []io.ReadCloser
nodeSlice := 0
for _, node := range b.nodes {
@ -514,8 +515,8 @@ func (b bucket) getDiskReaders(objectName, objectMeta string) ([]io.ReadCloser,
return readers, nil
}
// getDiskWriters -
func (b bucket) getDiskWriters(objectName, objectMeta string) ([]io.WriteCloser, error) {
// getWriters -
func (b bucket) getWriters(objectName, objectMeta string) ([]io.WriteCloser, error) {
var writers []io.WriteCloser
nodeSlice := 0
for _, node := range b.nodes {

40
pkg/storage/drivers/donut/donut.go
View File

@ -325,10 +325,16 @@ func (d donutDriver) GetObject(w io.Writer, bucketName, objectName string) (int6
return 0, iodine.New(drivers.InternalError{}, nil)
}
}
n, err := io.CopyN(w, reader, size)
pw := newProxyWriter(w)
n, err := io.CopyN(pw, reader, size)
if err != nil {
return 0, iodine.New(err, nil)
}
// Save in memory for future reads
d.objects.Set(objectKey, pw.writtenBytes)
// free up
pw.writtenBytes = nil
go debug.FreeOSMemory()
return n, nil
}
written, err := io.Copy(w, bytes.NewBuffer(data))
@ -492,31 +498,22 @@ func (d donutDriver) ListObjects(bucketName string, resources drivers.BucketReso
return results, resources, nil
}
type proxyReader struct {
reader io.Reader
readBytes []byte
type proxyWriter struct {
writer io.Writer
writtenBytes []byte
}
func (r *proxyReader) free(p []byte) {
p = nil
go debug.FreeOSMemory()
}
func (r *proxyReader) Read(p []byte) (n int, err error) {
defer r.free(p)
n, err = r.reader.Read(p)
if err == io.EOF || err == io.ErrUnexpectedEOF {
r.readBytes = append(r.readBytes, p[0:n]...)
return
}
func (r *proxyWriter) Write(p []byte) (n int, err error) {
n, err = r.writer.Write(p)
if err != nil {
return
}
r.readBytes = append(r.readBytes, p[0:n]...)
r.writtenBytes = append(r.writtenBytes, p[0:n]...)
return
}
func newProxyReader(r io.Reader) *proxyReader {
return &proxyReader{reader: r, readBytes: nil}
func newProxyWriter(w io.Writer) *proxyWriter {
return &proxyWriter{writer: w, writtenBytes: nil}
}
// CreateObject creates a new object
@ -565,8 +562,7 @@ func (d donutDriver) CreateObject(bucketName, objectName, contentType, expectedM
}
expectedMD5Sum = hex.EncodeToString(expectedMD5SumBytes)
}
newReader := newProxyReader(reader)
objMetadata, err := d.donut.PutObject(bucketName, objectName, expectedMD5Sum, newReader, metadata)
objMetadata, err := d.donut.PutObject(bucketName, objectName, expectedMD5Sum, reader, metadata)
if err != nil {
switch iodine.ToError(err).(type) {
case donut.BadDigest:
@ -574,10 +570,6 @@ func (d donutDriver) CreateObject(bucketName, objectName, contentType, expectedM
}
return "", iodine.New(err, errParams)
}
d.objects.Set(objectKey, newReader.readBytes)
// free up
newReader.readBytes = nil
go debug.FreeOSMemory()
newObject := drivers.ObjectMetadata{
Bucket: bucketName,
Key: objectName,

13
pkg/storage/drivers/donut/multipart.go
View File

@ -193,6 +193,7 @@ func (d donutDriver) createObjectPart(bucketName, objectName, uploadID string, p
d.lock.Unlock()
// setting up for de-allocation
readBytes = nil
go debug.FreeOSMemory()
md5Sum := hex.EncodeToString(md5SumBytes)
// Verify if the written object is equal to what is expected, only if it is requested as such
@ -258,6 +259,7 @@ func (d donutDriver) CompleteMultipartUpload(bucketName, objectName, uploadID st
d.lock.Lock()
var size int64
fullHasher := md5.New()
var fullObject bytes.Buffer
for i := 1; i <= len(parts); i++ {
recvMD5 := parts[i]
@ -280,7 +282,8 @@ func (d donutDriver) CompleteMultipartUpload(bucketName, objectName, uploadID st
Key: getMultipartKey(objectName, uploadID, i),
}, nil)
}
_, err = io.Copy(&fullObject, bytes.NewBuffer(object))
mw := io.MultiWriter(&fullObject, fullHasher)
_, err = io.Copy(mw, bytes.NewReader(object))
if err != nil {
return "", iodine.New(err, nil)
}
@ -289,9 +292,9 @@ func (d donutDriver) CompleteMultipartUpload(bucketName, objectName, uploadID st
}
d.lock.Unlock()
md5sumSlice := md5.Sum(fullObject.Bytes())
md5sumSlice := fullHasher.Sum(nil)
// this is needed for final verification inside CreateObject, do not convert this to hex
md5sum := base64.StdEncoding.EncodeToString(md5sumSlice[:])
md5sum := base64.StdEncoding.EncodeToString(md5sumSlice)
etag, err := d.CreateObject(bucketName, objectName, "", md5sum, size, &fullObject)
if err != nil {
// No need to call internal cleanup functions here, caller will call AbortMultipartUpload()
@ -299,6 +302,8 @@ func (d donutDriver) CompleteMultipartUpload(bucketName, objectName, uploadID st
return "", iodine.New(err, nil)
}
fullObject.Reset()
go debug.FreeOSMemory()
d.cleanupMultiparts(bucketName, objectName, uploadID)
d.cleanupMultipartSession(bucketName, objectName, uploadID)
return etag, nil
@ -421,5 +426,5 @@ func (d donutDriver) expiredPart(a ...interface{}) {
for _, storedBucket := range d.storedBuckets {
delete(storedBucket.partMetadata, key)
}
debug.FreeOSMemory()
go debug.FreeOSMemory()
}