[#1024] shard: Resync metabase concurrently

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

cmd/frostfs-node/config.go

@@ -119,10 +119,11 @@ type shardCfg struct {
 	estimateCompressibility          bool
 	estimateCompressibilityThreshold float64
 
-	smallSizeObjectLimit      uint64
-	uncompressableContentType []string
-	refillMetabase            bool
-	mode                      shardmode.Mode
+	smallSizeObjectLimit       uint64
+	uncompressableContentType  []string
+	refillMetabase             bool
+	refillMetabaseWorkersCount int
+	mode                       shardmode.Mode
 
 	metaCfg struct {
 		path          string
@@ -234,6 +235,7 @@ func (a *applicationConfiguration) updateShardConfig(c *config.Config, oldConfig
 	var newConfig shardCfg
 
 	newConfig.refillMetabase = oldConfig.RefillMetabase()
+	newConfig.refillMetabaseWorkersCount = oldConfig.RefillMetabaseWorkersCount()
 	newConfig.mode = oldConfig.Mode()
 	newConfig.compress = oldConfig.Compress()
 	newConfig.estimateCompressibility = oldConfig.EstimateCompressibility()
@@ -986,6 +988,7 @@ func (c *cfg) getShardOpts(shCfg shardCfg) shardOptsWithID {
 	sh.shOpts = []shard.Option{
 		shard.WithLogger(c.log),
 		shard.WithRefillMetabase(shCfg.refillMetabase),
+		shard.WithRefillMetabaseWorkersCount(shCfg.refillMetabaseWorkersCount),
 		shard.WithMode(shCfg.mode),
 		shard.WithBlobStorOptions(blobstoreOpts...),
 		shard.WithMetaBaseOptions(mbOptions...),

cmd/frostfs-node/config/engine/config_test.go

@@ -117,6 +117,7 @@ func TestEngineSection(t *testing.T) {
 
 				require.Equal(t, false, sc.RefillMetabase())
 				require.Equal(t, mode.ReadOnly, sc.Mode())
+				require.Equal(t, 100, sc.RefillMetabaseWorkersCount())
 			case 1:
 				require.Equal(t, "tmp/1/blob/pilorama.db", pl.Path())
 				require.Equal(t, fs.FileMode(0o644), pl.Perm())
@@ -168,6 +169,7 @@ func TestEngineSection(t *testing.T) {
 
 				require.Equal(t, true, sc.RefillMetabase())
 				require.Equal(t, mode.ReadWrite, sc.Mode())
+				require.Equal(t, shardconfig.RefillMetabaseWorkersCountDefault, sc.RefillMetabaseWorkersCount())
 			}
 			return nil
 		})

cmd/frostfs-node/config/engine/shard/config.go

@@ -18,6 +18,7 @@ const (
 	// SmallSizeLimitDefault is a default limit of small objects payload in bytes.
 	SmallSizeLimitDefault                   = 1 << 20
 	EstimateCompressibilityThresholdDefault = 0.1
+	RefillMetabaseWorkersCountDefault       = 500
 )
 
 // From wraps config section into Config.
@@ -134,6 +135,20 @@ func (x *Config) RefillMetabase() bool {
 	)
 }
 
+// RefillMetabaseWorkersCount returns the value of "resync_metabase_worker_count" config parameter.
+//
+// Returns RefillMetabaseWorkersCountDefault if the value is not a positive number.
+func (x *Config) RefillMetabaseWorkersCount() int {
+	v := config.IntSafe(
+		(*config.Config)(x),
+		"resync_metabase_worker_count",
+	)
+	if v > 0 {
+		return int(v)
+	}
+	return RefillMetabaseWorkersCountDefault
+}
+
 // Mode return the value of "mode" config parameter.
 //
 // Panics if read the value is not one of predefined