pkg/local_object_storage/engine/engine.go

@@ -133,7 +133,7 @@ func (e *StorageEngine) reportShardErrorBackground(id string, msg string, err er
 
 	errCount := sh.errorCount.Add(1)
 	sh.Shard.IncErrorCounter()
-	e.reportShardErrorWithFlags(sh.Shard, errCount, false, msg, err)
+	e.reportShardErrorWithFlags(sh.Shard, errCount, msg, err)
 }
 
 // reportShardError checks that the amount of errors doesn't exceed the configured threshold.
@@ -153,13 +153,12 @@ func (e *StorageEngine) reportShardError(
 
 	errCount := sh.errorCount.Add(1)
 	sh.Shard.IncErrorCounter()
-	e.reportShardErrorWithFlags(sh.Shard, errCount, true, msg, err, fields...)
+	e.reportShardErrorWithFlags(sh.Shard, errCount, msg, err, fields...)
 }
 
 func (e *StorageEngine) reportShardErrorWithFlags(
 	sh *shard.Shard,
 	errCount uint32,
-	block bool,
 	msg string,
 	err error,
 	fields ...zap.Field,
@@ -175,23 +174,19 @@ func (e *StorageEngine) reportShardErrorWithFlags(
 		return
 	}
 
-	if block {
+	req := setModeRequest{
-		e.moveToDegraded(sh, errCount)
+		errorCount: errCount,
-	} else {
+		sh:         sh,
-		req := setModeRequest{
+	}
-			errorCount: errCount,
-			sh:         sh,
-		}
 
-		select {
+	select {
-		case e.setModeCh <- req:
+	case e.setModeCh <- req:
-		default:
+	default:
-			// For background workers we can have a lot of such errors,
+		// For background workers we can have a lot of such errors,
-			// thus logging is done with DEBUG level.
+		// thus logging is done with DEBUG level.
-			e.log.Debug(logs.EngineModeChangeIsInProgressIgnoringSetmodeRequest,
+		e.log.Debug(logs.EngineModeChangeIsInProgressIgnoringSetmodeRequest,
-				zap.Stringer("shard_id", sid),
+			zap.Stringer("shard_id", sid),
-				zap.Uint32("error_count", errCount))
+			zap.Uint32("error_count", errCount))
-		}
 	}
 }
 

pkg/local_object_storage/engine/error_test.go

@@ -7,6 +7,7 @@ import (
 	"path/filepath"
 	"strconv"
 	"testing"
+	"time"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/object"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor"
@@ -229,6 +230,8 @@ func checkShardState(t *testing.T, e *StorageEngine, id *shard.ID, errCount uint
 	sh := e.shards[id.String()]
 	e.mtx.RUnlock()
 
-	require.Equal(t, errCount, sh.errorCount.Load())
+	require.Eventually(t, func() bool {
-	require.Equal(t, mode, sh.GetMode())
+		return errCount == sh.errorCount.Load() &&
+			mode == sh.GetMode()
+	}, 10*time.Second, 10*time.Millisecond, "shard mode doesn't changed to expected state in 10 seconds")
 }

pkg/local_object_storage/engine/head.go

@@ -85,6 +85,7 @@ func (e *StorageEngine) head(ctx context.Context, prm HeadPrm) (HeadRes, error)
 	shPrm.SetRaw(prm.raw)
 
 	e.iterateOverSortedShards(prm.addr, func(_ int, sh hashedShard) (stop bool) {
+		shPrm.ShardLooksBad = sh.errorCount.Load() >= e.errorsThreshold
 		res, err := sh.Head(ctx, shPrm)
 		if err != nil {
 			switch {

pkg/local_object_storage/shard/head.go

@@ -13,8 +13,9 @@ import (
 
 // HeadPrm groups the parameters of Head operation.
 type HeadPrm struct {
-	addr oid.Address
+	addr          oid.Address
-	raw  bool
+	raw           bool
+	ShardLooksBad bool
 }
 
 // HeadRes groups the resulting values of Head operation.
@@ -59,7 +60,8 @@ func (s *Shard) Head(ctx context.Context, prm HeadPrm) (HeadRes, error) {
 
 	var obj *objectSDK.Object
 	var err error
-	if s.GetMode().NoMetabase() {
+	mode := s.GetMode()
+	if mode.NoMetabase() || (mode.ReadOnly() && prm.ShardLooksBad) {
 		var getPrm GetPrm
 		getPrm.SetAddress(prm.addr)
 		getPrm.SetIgnoreMeta(true)