[#661] blobovniczatree: Make Rebuild concurrent for objects

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

pkg/local_object_storage/blobstor/blobovniczatree/option.go

@@ -25,6 +25,7 @@ type cfg struct {
 	metrics            Metrics
 	waitBeforeDropDB   time.Duration
 	blzInitWorkerCount int
+	blzMoveBatchSize   int
 }
 
 type Option func(*cfg)
@@ -36,6 +37,7 @@ const (
 	defaultBlzShallowWidth    = 16
 	defaultWaitBeforeDropDB   = 10 * time.Second
 	defaultBlzInitWorkerCount = 5
+	defaulBlzMoveBatchSize    = 10000
 )
 
 func initConfig(c *cfg) {
@@ -49,6 +51,7 @@ func initConfig(c *cfg) {
 		metrics:            &noopMetrics{},
 		waitBeforeDropDB:   defaultWaitBeforeDropDB,
 		blzInitWorkerCount: defaultBlzInitWorkerCount,
+		blzMoveBatchSize:   defaulBlzMoveBatchSize,
 	}
 }
 
@@ -119,6 +122,12 @@ func WithWaitBeforeDropDB(t time.Duration) Option {
 	}
 }
 
+func WithMoveBatchSize(v int) Option {
+	return func(c *cfg) {
+		c.blzMoveBatchSize = v
+	}
+}
+
 // WithInitWorkerCount sets maximum workers count to init blobovnicza tree.
 //
 // Negative or zero value means no limit.