[#734] shard: Fix Delete method

Due to the flushing data from the writecache to the storage
and simultaneous deletion, a partial deletion situation is possible.
So as a solution, deletion is allowed only when the object is in storage,
because object will be deleted from writecache by flush goroutine.

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

pkg/local_object_storage/shard/delete.go

@@ -2,15 +2,12 @@ package shard
 
 import (
 	"context"
-	"errors"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
 	meta "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/metabase"
-	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/writecache"
 	tracingPkg "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/tracing"
 	"git.frostfs.info/TrueCloudLab/frostfs-observability/tracing"
-	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/trace"
@@ -34,8 +31,7 @@ func (p *DeletePrm) SetAddresses(addr ...oid.Address) {
 	p.addr = append(p.addr, addr...)
 }
 
-// Delete removes data from the shard's writeCache, metaBase and
+// Delete removes data from the shard's metaBase and// blobStor.
-// blobStor.
 func (s *Shard) Delete(ctx context.Context, prm DeletePrm) (DeleteRes, error) {
 	ctx, span := tracing.StartSpanFromContext(ctx, "Shard.Delete",
 		trace.WithAttributes(
@@ -47,10 +43,10 @@ func (s *Shard) Delete(ctx context.Context, prm DeletePrm) (DeleteRes, error) {
 	s.m.RLock()
 	defer s.m.RUnlock()
 
-	return s.delete(ctx, prm)
+	return s.delete(ctx, prm, false)
 }
 
-func (s *Shard) delete(ctx context.Context, prm DeletePrm) (DeleteRes, error) {
+func (s *Shard) delete(ctx context.Context, prm DeletePrm, skipFailed bool) (DeleteRes, error) {
 	if s.info.Mode.ReadOnly() {
 		return DeleteRes{}, ErrReadOnlyMode
 	} else if s.info.Mode.NoMetabase() {
@@ -65,12 +61,18 @@ func (s *Shard) delete(ctx context.Context, prm DeletePrm) (DeleteRes, error) {
 		default:
 		}
 
-		s.deleteObjectFromWriteCacheSafe(ctx, addr)
+		if err := s.deleteFromBlobstor(ctx, addr); err != nil {
-
+			if skipFailed {
-		s.deleteFromBlobstorSafe(ctx, addr)
+				continue
+			}
+			return result, err
+		}
 
 		if err := s.deleteFromMetabase(ctx, addr); err != nil {
-			return result, err // stop on metabase error ?
+			if skipFailed {
+				continue
+			}
+			return result, err
 		}
 		result.deleted++
 	}
@@ -78,16 +80,7 @@ func (s *Shard) delete(ctx context.Context, prm DeletePrm) (DeleteRes, error) {
 	return result, nil
 }
 
-func (s *Shard) deleteObjectFromWriteCacheSafe(ctx context.Context, addr oid.Address) {
+func (s *Shard) deleteFromBlobstor(ctx context.Context, addr oid.Address) error {
-	if s.hasWriteCache() {
-		err := s.writeCache.Delete(ctx, addr)
-		if err != nil && !client.IsErrObjectNotFound(err) && !errors.Is(err, writecache.ErrReadOnly) {
-			s.log.Warn(logs.ShardCantDeleteObjectFromWriteCache, zap.Error(err))
-		}
-	}
-}
-
-func (s *Shard) deleteFromBlobstorSafe(ctx context.Context, addr oid.Address) {
 	var sPrm meta.StorageIDPrm
 	sPrm.SetAddress(addr)
 
@@ -97,6 +90,7 @@ func (s *Shard) deleteFromBlobstorSafe(ctx context.Context, addr oid.Address) {
 			zap.Stringer("object", addr),
 			zap.String("error", err.Error()),
 			zap.String("trace_id", tracingPkg.GetTraceID(ctx)))
+		return err
 	}
 	storageID := res.StorageID()
 
@@ -111,6 +105,7 @@ func (s *Shard) deleteFromBlobstorSafe(ctx context.Context, addr oid.Address) {
 			zap.String("error", err.Error()),
 			zap.String("trace_id", tracingPkg.GetTraceID(ctx)))
 	}
+	return err
 }
 
 func (s *Shard) deleteFromMetabase(ctx context.Context, addr oid.Address) error {

pkg/local_object_storage/shard/delete_test.go

@@ -52,13 +52,18 @@ func testShardDelete(t *testing.T, hasWriteCache bool) {
 		_, err = testGet(t, sh, getPrm, hasWriteCache)
 		require.NoError(t, err)
 
-		_, err = sh.Delete(context.TODO(), delPrm)
+		if hasWriteCache {
-		require.NoError(t, err)
-
 			require.Eventually(t, func() bool {
+				_, err = sh.Delete(context.Background(), delPrm)
+				return err == nil
+			}, 30*time.Second, 100*time.Millisecond)
+		} else {
+			_, err = sh.Delete(context.Background(), delPrm)
+			require.NoError(t, err)
+		}
+
 		_, err = sh.Get(context.Background(), getPrm)
-			return client.IsErrObjectNotFound(err)
+		require.True(t, client.IsErrObjectNotFound(err))
-		}, time.Second, 50*time.Millisecond)
 	})
 
 	t.Run("small object", func(t *testing.T) {
@@ -78,12 +83,17 @@ func testShardDelete(t *testing.T, hasWriteCache bool) {
 		_, err = sh.Get(context.Background(), getPrm)
 		require.NoError(t, err)
 
+		if hasWriteCache {
+			require.Eventually(t, func() bool {
+				_, err = sh.Delete(context.Background(), delPrm)
+				return err == nil
+			}, 10*time.Second, 100*time.Millisecond)
+		} else {
 			_, err = sh.Delete(context.Background(), delPrm)
 			require.NoError(t, err)
+		}
 
-		require.Eventually(t, func() bool {
 		_, err = sh.Get(context.Background(), getPrm)
-			return client.IsErrObjectNotFound(err)
+		require.True(t, client.IsErrObjectNotFound(err))
-		}, time.Second, 50*time.Millisecond)
 	})
 }

pkg/local_object_storage/shard/gc.go

@@ -297,7 +297,7 @@ func (s *Shard) removeGarbage(pctx context.Context) (result gcRunResult) {
 	deletePrm.SetAddresses(buf...)
 
 	// delete accumulated objects
-	res, err := s.delete(ctx, deletePrm)
+	res, err := s.delete(ctx, deletePrm, true)
 
 	result.deleted = res.deleted
 	result.failedToDelete = uint64(len(buf)) - res.deleted