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avoid possible nil

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fix https://github.com/chrislusf/seaweedfs/issues/1928

The nil was because of `dn.Parent().UnlinkChildNode(dn.Id())` in topo.UnRegisterDataNode() function, when the dn leaves the cluster.
This commit is contained in:
Chris Lu 2021-03-22 13:24:07 -07:00
parent f315eb2bb8
commit 5d931eff27
1 changed files with 5 additions and 1 deletions
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6
weed/server/master_grpc_server.go
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@ -80,10 +80,14 @@ func (ms *MasterServer) SendHeartbeat(stream master_pb.Seaweed_SendHeartbeatServ
dn.AdjustMaxVolumeCounts(heartbeat.MaxVolumeCounts)
glog.V(4).Infof("master received heartbeat %s", heartbeat.String())
var dataCenter string
if dc := dn.GetDataCenter(); dc != nil {
dataCenter = string(dc.Id())
}
message := &master_pb.VolumeLocation{
Url: dn.Url(),
PublicUrl: dn.PublicUrl,
DataCenter: string(dn.GetDataCenter().Id()),
DataCenter: dataCenter,
}
if len(heartbeat.NewVolumes) > 0 || len(heartbeat.DeletedVolumes) > 0 {
// process delta volume ids if exists for fast volume id updates