[#115] pool: Drop part buffer pool

Tests showed that using part buffer pool doesn't save memory a lot.
Especially on big parts.
Probably we can use pool only for small parts
after adding buffer in payloadSizeLimiter

Signed-off-by: Denis Kirillov <d.kirillov@yadro.com>

pool/object_put_pool_transformer.go

@@ -36,6 +36,7 @@ func (c *clientWrapper) objectPutInitTransformer(prm PrmObjectPutClientCutInit)
 		address: c.address(),
 		logger:  &c.clientStatusMonitor,
 	}
+
 	key := &c.prm.key
 	if prm.key != nil {
 		key = prm.key
@@ -74,6 +75,7 @@ type ResObjectPut struct {
 	OID    oid.ID
 }
 
+// Close return non nil result in any case. If error occurred, the result contains only buffer for further reusing.
 func (x *objectWriterTransformer) Close(ctx context.Context) (*ResObjectPut, error) {
 	ai, err := x.ot.Close(ctx)
 	if err != nil {

pool/parts_buffer_pool.go

@@ -1,69 +0,0 @@
-package pool
-
-import (
-	"fmt"
-	"sync"
-)
-
-type PartBuffer struct {
-	Buffer []byte
-	len    uint64
-}
-
-type PartsBufferPool struct {
-	syncPool      *sync.Pool
-	limit         uint64
-	maxObjectSize uint64
-
-	mu        sync.Mutex
-	available uint64
-}
-
-func NewPartBufferPool(limit uint64, maxObjectSize uint64) *PartsBufferPool {
-	return &PartsBufferPool{
-		limit:         limit,
-		maxObjectSize: maxObjectSize,
-		available:     limit,
-		syncPool: &sync.Pool{New: func() any {
-			// We have to use pointer (even for slices), see https://staticcheck.dev/docs/checks/#SA6002
-			// It's based on interfaces implementation in 2016, so maybe something has changed since then.
-			// We can use no pointer for multi-kilobyte slices though https://github.com/golang/go/issues/16323#issuecomment-254401036
-			buff := make([]byte, maxObjectSize)
-			return &buff
-		}},
-	}
-}
-
-func (p *PartsBufferPool) ParBufferSize() uint64 {
-	return p.maxObjectSize
-}
-
-func (p *PartsBufferPool) GetBuffer() (*PartBuffer, error) {
-	p.mu.Lock()
-	defer p.mu.Unlock()
-
-	if p.maxObjectSize > p.available {
-		return nil, fmt.Errorf("requested buffer size %d is greater than available: %d", p.maxObjectSize, p.available)
-	}
-
-	p.available -= p.maxObjectSize
-
-	return &PartBuffer{
-		Buffer: *p.syncPool.Get().(*[]byte),
-		len:    p.maxObjectSize,
-	}, nil
-}
-
-func (p *PartsBufferPool) FreeBuffer(buff *PartBuffer) error {
-	p.mu.Lock()
-	defer p.mu.Unlock()
-
-	if buff.len+p.available > p.limit {
-		return fmt.Errorf("buffer size %d to free is too large, available: %d, limit: %d", buff.len, p.available, p.limit)
-	}
-
-	p.available += buff.len
-	p.syncPool.Put(&buff.Buffer)
-
-	return nil
-}

pool/pool.go

@@ -679,7 +679,7 @@ func (c *clientWrapper) objectPutServerCut(ctx context.Context, prm PrmObjectPut
 		}
 
 		if prm.payload != nil {
-			const defaultBufferSizePut = 3 << 20 // configure?
+			const defaultBufferSizePut = 3 << 20 // default grpc message size, configure?
 
 			if sz == 0 || sz > defaultBufferSizePut {
 				sz = defaultBufferSizePut
@@ -736,22 +736,33 @@ func (c *clientWrapper) objectPutClientCut(ctx context.Context, prm PrmObjectPut
 	}
 
 	if wObj.WriteHeader(ctx, prm.hdr) {
+		sz := prm.hdr.PayloadSize()
+
 		if data := prm.hdr.Payload(); len(data) > 0 {
 			if prm.payload != nil {
 				prm.payload = io.MultiReader(bytes.NewReader(data), prm.payload)
 			} else {
 				prm.payload = bytes.NewReader(data)
+				sz = uint64(len(data))
 			}
 		}
 
 		if prm.payload != nil {
+			const defaultBufferSizePut = 64 * 1024 // it's buffer size in s3-gw, configure?
+
+			if sz == 0 || sz > defaultBufferSizePut {
+				sz = defaultBufferSizePut
+			}
+
+			buf := make([]byte, sz)
+
 			var n int
 
 			for {
-				n, err = prm.payload.Read(prm.partBuffer)
+				n, err = prm.payload.Read(buf)
 				if n > 0 {
 					start = time.Now()
-					successWrite := wObj.WritePayloadChunk(ctx, prm.partBuffer[:n])
+					successWrite := wObj.WritePayloadChunk(ctx, buf[:n])
 					c.incRequests(time.Since(start), methodObjectPut)
 					if !successWrite {
 						break
@@ -1151,7 +1162,6 @@ type InitParameters struct {
 	nodeParams                []NodeParam
 	requestCallback           func(RequestInfo)
 	dialOptions               []grpc.DialOption
-	maxClientCutMemory        uint64
 
 	clientBuilder clientBuilder
 }
@@ -1216,14 +1226,6 @@ func (x *InitParameters) SetGRPCDialOptions(opts ...grpc.DialOption) {
 	x.dialOptions = opts
 }
 
-// SetMaxClientCutMemory sets the max amount of bytes that can be used during client cut (see PrmObjectPut.SetClientCut).
-// Default value is 1gb (that should be enough for 200 concurrent PUT request for MaxObjectSize 50mb).
-// If the MaxObjectSize network param is greater than limit is set by this method
-// Pool.PutObject operations with PrmObjectPut.SetClientCut will fail.
-func (x *InitParameters) SetMaxClientCutMemory(size uint64) {
-	x.maxClientCutMemory = size
-}
-
 // setClientBuilder sets clientBuilder used for client construction.
 // Wraps setClientBuilderContext without a context.
 func (x *InitParameters) setClientBuilder(builder clientBuilder) {
@@ -1406,7 +1408,6 @@ type PrmObjectPut struct {
 	copiesNumber []uint32
 
 	clientCut   bool
-	partBuffer  []byte
 	networkInfo netmap.NetworkInfo
 }
 
@@ -1442,10 +1443,6 @@ func (x *PrmObjectPut) SetClientCut(clientCut bool) {
 	x.clientCut = clientCut
 }
 
-func (x *PrmObjectPut) setPartBuffer(partBuffer []byte) {
-	x.partBuffer = partBuffer
-}
-
 func (x *PrmObjectPut) setNetworkInfo(ni netmap.NetworkInfo) {
 	x.networkInfo = ni
 }
@@ -1746,10 +1743,7 @@ type Pool struct {
 	clientBuilder   clientBuilder
 	logger          *zap.Logger
 
-	// we cannot initialize partBufferPool in NewPool function,
+	maxObjectSize uint64
-	// so we have to save maxClientCutMemory param for further initialization in Dial.
-	maxClientCutMemory uint64
-	partsBufferPool    *PartsBufferPool
 }
 
 type innerPool struct {
@@ -1761,7 +1755,6 @@ type innerPool struct {
 const (
 	defaultSessionTokenExpirationDuration = 100 // in blocks
 	defaultErrorThreshold                 = 100
-	defaultMaxClientCutMemory             = 1024 * 1024 * 1024 // 1gb
 
 	defaultRebalanceInterval  = 15 * time.Second
 	defaultHealthcheckTimeout = 4 * time.Second
@@ -1798,8 +1791,7 @@ func NewPool(options InitParameters) (*Pool, error) {
 			clientRebalanceInterval:   options.clientRebalanceInterval,
 			sessionExpirationDuration: options.sessionExpirationDuration,
 		},
-		clientBuilder:      options.clientBuilder,
+		clientBuilder: options.clientBuilder,
-		maxClientCutMemory: options.maxClientCutMemory,
 	}
 
 	return pool, nil
@@ -1860,7 +1852,7 @@ func (p *Pool) Dial(ctx context.Context) error {
 	if err != nil {
 		return fmt.Errorf("get network info for max object size: %w", err)
 	}
-	p.partsBufferPool = NewPartBufferPool(p.maxClientCutMemory, ni.MaxObjectSize())
+	p.maxObjectSize = ni.MaxObjectSize()
 
 	go p.startRebalance(ctx)
 	return nil
@@ -1883,10 +1875,6 @@ func fillDefaultInitParams(params *InitParameters, cache *sessionCache) {
 		params.errorThreshold = defaultErrorThreshold
 	}
 
-	if params.maxClientCutMemory == 0 {
-		params.maxClientCutMemory = defaultMaxClientCutMemory
-	}
-
 	if params.clientRebalanceInterval <= 0 {
 		params.clientRebalanceInterval = defaultRebalanceInterval
 	}
@@ -2284,24 +2272,10 @@ func (p *Pool) PutObject(ctx context.Context, prm PrmObjectPut) (oid.ID, error)
 	}
 
 	if prm.clientCut {
-		buff, err := p.partsBufferPool.GetBuffer()
-		if err != nil {
-			return oid.ID{}, fmt.Errorf("cannot get buffer for put operations: %w", err)
-		}
-
-		prm.setPartBuffer(buff.Buffer)
-
 		var ni netmap.NetworkInfo
 		ni.SetCurrentEpoch(p.cache.Epoch())
-		ni.SetMaxObjectSize(p.partsBufferPool.ParBufferSize()) // we want to use initial max object size in PayloadSizeLimiter
+		ni.SetMaxObjectSize(p.maxObjectSize) // we want to use initial max object size in PayloadSizeLimiter
-
 		prm.setNetworkInfo(ni)
-
-		defer func() {
-			if errFree := p.partsBufferPool.FreeBuffer(buff); errFree != nil {
-				p.log(zap.WarnLevel, "failed to free part buffer", zap.Error(err))
-			}
-		}()
 	}
 
 	id, err := ctxCall.client.objectPut(ctx, prm)