From 9c9ba3c209a4e833727b5e4a797bfdd332b2cb4f Mon Sep 17 00:00:00 2001
From: Chris Lu <chris.lu@gmail.com>
Date: Sun, 3 Jan 2021 12:25:58 -0800
Subject: [PATCH] nil related

related to https://github.com/chrislusf/seaweedfs/issues/1676
---
 weed/topology/data_node.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/weed/topology/data_node.go b/weed/topology/data_node.go
index 0a4df63d0..eaed51654 100644
--- a/weed/topology/data_node.go
+++ b/weed/topology/data_node.go
@@ -151,7 +151,10 @@ func (dn *DataNode) GetVolumesById(id needle.VolumeId) (storage.VolumeInfo, erro
 }
 
 func (dn *DataNode) GetDataCenter() *DataCenter {
-	return dn.Parent().Parent().(*NodeImpl).value.(*DataCenter)
+	rack := dn.Parent()
+	dcNode := rack.Parent()
+	dcValue := dcNode.GetValue()
+	return dcValue.(*DataCenter)
 }
 
 func (dn *DataNode) GetRack() *Rack {