[#826] blobovniczatree: Do not create DB's on init

Blobovniczas will be created on write requests.

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

pkg/local_object_storage/blobstor/blobovniczatree/control.go

@@ -82,27 +82,29 @@ func (b *Blobovniczas) initializeDBs(ctx context.Context) error {
 		return err
 	}
 
-	err = b.iterateSortedLeaves(egCtx, nil, func(p string) (bool, error) {
-		if _, found := visited[p]; found {
-			return false, nil
-		}
-		eg.Go(func() error {
-			shBlz := b.getBlobovniczaWithoutCaching(p)
-			_, err := shBlz.Open()
-			if err != nil {
-				return err
+	if b.createDBInAdvance {
+		err = b.iterateSortedLeaves(egCtx, nil, func(p string) (bool, error) {
+			if _, found := visited[p]; found {
+				return false, nil
 			}
-			defer shBlz.Close()
+			eg.Go(func() error {
+				shBlz := b.getBlobovniczaWithoutCaching(p)
+				_, err := shBlz.Open()
+				if err != nil {
+					return err
+				}
+				defer shBlz.Close()
 
-			b.log.Debug(logs.BlobovniczatreeBlobovniczaSuccessfullyInitializedClosing, zap.String("id", p))
-			return nil
+				b.log.Debug(logs.BlobovniczatreeBlobovniczaSuccessfullyInitializedClosing, zap.String("id", p))
+				return nil
+			})
+			return false, nil
 		})
-		return false, nil
-	})
 
-	if err != nil {
-		_ = eg.Wait()
-		return err
+		if err != nil {
+			_ = eg.Wait()
+			return err
+		}
 	}
 
 	return eg.Wait()

pkg/local_object_storage/blobstor/blobovniczatree/iterate_test.go

@@ -16,6 +16,7 @@ func TestIterateSortedLeavesAndDBPathsAreSame(t *testing.T) {
 		WithBlobovniczaShallowWidth(5),
 		WithRootPath(t.TempDir()),
 	)
+	blz.createDBInAdvance = true
 	require.NoError(t, blz.Open(false))
 	require.NoError(t, blz.Init())
 	defer func() {

pkg/local_object_storage/blobstor/blobovniczatree/option.go

@@ -26,6 +26,7 @@ type cfg struct {
 	waitBeforeDropDB   time.Duration
 	blzInitWorkerCount int
 	blzMoveBatchSize   int
+	createDBInAdvance  bool
 }
 
 type Option func(*cfg)
@@ -139,3 +140,10 @@ func WithInitWorkerCount(v int) Option {
 		c.blzInitWorkerCount = v
 	}
 }
+
+// WithInitInAdvance returns an option to create blobovnicza tree DB's in advance.
+func WithInitInAdvance(v bool) Option {
+	return func(c *cfg) {
+		c.createDBInAdvance = v
+	}
+}