address some review comments

store/lfuda.go

@@ -40,8 +40,6 @@ func NewLFUDAStore(component string, store BlobStore, maxSize float64) *LFUDASto
 
 const nameLFUDA = "lfuda"
 
-var fakeTrue = []byte{'t'}
-
 // Name is the cache type name
 func (l *LFUDAStore) Name() string { return nameLFUDA }
 
@@ -66,7 +64,7 @@ func (l *LFUDAStore) Get(hash string) (stream.Blob, error) {
 
 // Put stores the blob. Following LFUDA rules it's not guaranteed that a SET will store the value!!!
 func (l *LFUDAStore) Put(hash string, blob stream.Blob) error {
-	l.lfuda.Set(hash, fakeTrue)
+	l.lfuda.Set(hash, true)
 	has, _ := l.Has(hash)
 	if has {
 		err := l.store.Put(hash, blob)
@@ -77,14 +75,16 @@ func (l *LFUDAStore) Put(hash string, blob stream.Blob) error {
 	return nil
 }
 
-// PutSD stores the sd blob
+// PutSD stores the sd blob. Following LFUDA rules it's not guaranteed that a SET will store the value!!!
 func (l *LFUDAStore) PutSD(hash string, blob stream.Blob) error {
-	err := l.store.PutSD(hash, blob)
-	if err != nil {
-		return err
+	l.lfuda.Set(hash, true)
+	has, _ := l.Has(hash)
+	if has {
+		err := l.store.PutSD(hash, blob)
+		if err != nil {
+			return err
+		}
 	}
-
-	l.lfuda.Set(hash, fakeTrue)
 	return nil
 }
 
@@ -109,12 +109,13 @@ func (l *LFUDAStore) loadExisting(store lister, maxItems int) error {
 	if err != nil {
 		return err
 	}
+	logrus.Infof("read %d files from disk", len(existing))
 
 	added := 0
 	for _, h := range existing {
-		l.lfuda.Set(h, fakeTrue)
+		l.lfuda.Set(h, true)
 		added++
-		if maxItems > 0 && added >= maxItems { // underlying cache is bigger than LRU cache
+		if maxItems > 0 && added >= maxItems { // underlying cache is bigger than the cache
 			break
 		}
 	}

store/lfuda_test.go

@@ -8,7 +8,6 @@ import (
 	"time"
 
 	"github.com/lbryio/lbry.go/v2/extras/errors"
-	log "github.com/sirupsen/logrus"
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@@ -68,8 +67,6 @@ func TestFUDAStore_Eviction(t *testing.T) {
 
 	assert.Equal(t, cacheMaxBlobs, len(mem.Debug()))
 
-	keys := lfuda.lfuda.Keys()
-	log.Infof("%+v", keys)
 	for k, v := range map[string]bool{
 		"one":   false,
 		"two":   true,

store/lru.go

@@ -6,6 +6,7 @@ import (
 	"github.com/lbryio/reflector.go/internal/metrics"
 
 	golru "github.com/hashicorp/golang-lru"
+	"github.com/sirupsen/logrus"
 )
 
 // LRUStore adds a max cache size and LRU eviction to a BlobStore
@@ -106,11 +107,12 @@ func (l *LRUStore) Delete(hash string) error {
 
 // loadExisting imports existing blobs from the underlying store into the LRU cache
 func (l *LRUStore) loadExisting(store lister, maxItems int) error {
+	logrus.Infof("loading at most %d items", maxItems)
 	existing, err := store.list()
 	if err != nil {
 		return err
 	}
-
+	logrus.Infof("read %d files from disk", len(existing))
 	added := 0
 	for _, h := range existing {
 		l.lru.Add(h, true)

store/speedwalk/speedwalk.go

@@ -83,6 +83,5 @@ func AllFiles(startDir string, basename bool) ([]string, error) {
 
 	close(pathChan)
 	pathWG.Wait()
-	logrus.Infoln("loaded LRU")
 	return paths, nil
 }