[#57] node: Broadcast link objects

It boosts object assembling by an _average_ container node.

Signed-off-by: Pavel Karpy <p.karpy@yadro.com>

CHANGELOG.md

@@ -13,6 +13,7 @@ Changelog for FrostFS Node
 ### Changed
 - `common.PrintVerbose` prints via `cobra.Command.Printf` (#1962)
 - Env prefix in configuration changed to `FROSTFS_*` (#43)
+- Link object is broadcast throughout the whole container now (#57)
 
 ### Fixed
 - Increase payload size metric on shards' `put` operation (#1794)

pkg/services/object/put/distributed.go

@@ -141,6 +141,11 @@ func (t *distributedTarget) Close() (*transformer.AccessIdentifiers, error) {
 		return nil, fmt.Errorf("(%T) could not validate payload content: %w", t, err)
 	}
 
+	if len(t.obj.Children()) > 0 {
+		// enabling extra broadcast for linking objects
+		t.traversal.extraBroadcastEnabled = true
+	}
+
 	return t.iteratePlacement(t.sendObject)
 }