Pool zstd encoding/decoding

tempodb/backend/compression.go

@@ -0,0 +1,45 @@
+package backend
+
+import (
+	"sync"
+
+	"github.com/klauspost/compress/zstd"
+)
+
+var _ Codec = (*ZstdCodec)(nil)
+
+type Codec interface {
+	Encode([]byte, []byte) ([]byte, error)
+	Decode([]byte) ([]byte, error)
+}
+
+type ZstdCodec struct {
+	encoders sync.Pool // *zstd.Encoder
+	decoders sync.Pool // *zstd.Decoder
+}
+
+func (c *ZstdCodec) Encode(src, dst []byte) ([]byte, error) {
+	e, _ := c.encoders.Get().(*zstd.Encoder)
+	if e == nil {
+		var err error
+		e, err = zstd.NewWriter(nil, zstd.WithEncoderConcurrency(1))
+		if err != nil {
+			return nil, err
+		}
+	}
+	defer c.encoders.Put(e)
+	return e.EncodeAll(src, dst), nil
+}
+
+func (c *ZstdCodec) Decode(buf []byte) ([]byte, error) {
+	d, _ := c.decoders.Get().(*zstd.Decoder)
+	if d == nil {
+		var err error
+		d, err = zstd.NewReader(nil, zstd.WithDecoderConcurrency(0))
+		if err != nil {
+			return nil, err
+		}
+	}
+	defer c.decoders.Put(d)
+	return d.DecodeAll(buf, nil)
+}

tempodb/backend/tenantindex.go

@@ -8,14 +8,16 @@ import (
 
 	proto "github.com/gogo/protobuf/proto"
 	"github.com/klauspost/compress/gzip"
-	"github.com/klauspost/compress/zstd"
 )
 
 const (
 	internalFilename = "index.json"
 )
 
-var _ proto.Message = (*TenantIndex)(nil)
+var (
+	_    proto.Message = (*TenantIndex)(nil)
+	Zstd               = &ZstdCodec{}
+)
 
 func newTenantIndex(meta []*BlockMeta, compactedMeta []*CompactedBlockMeta) *TenantIndex {
 	return &TenantIndex{
@@ -63,38 +65,17 @@ func (b *TenantIndex) unmarshal(buffer []byte) error {
 }
 
 func (b *TenantIndex) marshalPb() ([]byte, error) {
-	buffer := &bytes.Buffer{}
-
-	z, err := zstd.NewWriter(buffer)
-	if err != nil {
-		return nil, err
-	}
-
 	pbBytes, err := proto.Marshal(b)
 	if err != nil {
 		return nil, err
 	}
 
-	if _, err = z.Write(pbBytes); err != nil {
-		return nil, err
-	}
-	if err = z.Flush(); err != nil {
-		return nil, err
-	}
-	if err = z.Close(); err != nil {
-		return nil, err
-	}
-
-	return buffer.Bytes(), nil
+	buffer := []byte{}
+	return Zstd.Encode(pbBytes, buffer)
 }
 
 func (b *TenantIndex) unmarshalPb(buffer []byte) error {
-	decoder, err := zstd.NewReader(nil, zstd.WithDecoderConcurrency(0))
-	if err != nil {
-		return fmt.Errorf("error creating zstd decoder: %w", err)
-	}
-
-	bb, err := decoder.DecodeAll(buffer, nil)
+	bb, err := Zstd.Decode(buffer)
 	if err != nil {
 		return fmt.Errorf("error decoding zstd: %w", err)
 	}

tempodb/backend/tenantindex_benchmark_test.go

@@ -85,3 +85,44 @@ func BenchmarkIndexUnmarshal(b *testing.B) {
 		_ = unIdx.unmarshal(buf)
 	}
 }
+
+func BenchmarkIndexUnmarshalPb(b *testing.B) {
+	idx := &TenantIndex{
+		Meta: []*BlockMeta{
+			NewBlockMeta("test", uuid.New(), "v1", EncGZIP, "adsf"),
+			NewBlockMeta("test", uuid.New(), "v2", EncNone, "adsf"),
+			NewBlockMeta("test", uuid.New(), "v3", EncLZ4_4M, "adsf"),
+		},
+		CompactedMeta: []*CompactedBlockMeta{
+			{
+				BlockMeta:     *NewBlockMeta("test", uuid.New(), "v1", EncGZIP, "adsf"),
+				CompactedTime: time.Now(),
+			},
+			{
+				BlockMeta:     *NewBlockMeta("test", uuid.New(), "v1", EncZstd, "adsf"),
+				CompactedTime: time.Now(),
+			},
+			{
+				BlockMeta:     *NewBlockMeta("test", uuid.New(), "v1", EncSnappy, "adsf"),
+				CompactedTime: time.Now(),
+			},
+		},
+	}
+
+	for i := range idx.Meta {
+		idx.Meta[i].DedicatedColumns = DedicatedColumns{
+			{Scope: "resource", Name: "namespace", Type: "string"},
+			{Scope: "span", Name: "http.method", Type: "string"},
+			{Scope: "span", Name: "namespace", Type: "string"},
+		}
+	}
+
+	buf, err := idx.marshalPb()
+	require.NoError(b, err)
+
+	unIdx := &TenantIndex{}
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		_ = unIdx.unmarshalPb(buf)
+	}
+}