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stop when dn.parent is nil
fix https://github.com/chrislusf/seaweedfs/issues/473
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@ -56,5 +56,7 @@ func (t *Topology) UnRegisterDataNode(dn *DataNode) {
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dn.UpAdjustVolumeCountDelta(-dn.GetVolumeCount())
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dn.UpAdjustVolumeCountDelta(-dn.GetVolumeCount())
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dn.UpAdjustActiveVolumeCountDelta(-dn.GetActiveVolumeCount())
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dn.UpAdjustActiveVolumeCountDelta(-dn.GetActiveVolumeCount())
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dn.UpAdjustMaxVolumeCountDelta(-dn.GetMaxVolumeCount())
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dn.UpAdjustMaxVolumeCountDelta(-dn.GetMaxVolumeCount())
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dn.Parent().UnlinkChildNode(dn.Id())
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if dn.Parent() != nil {
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dn.Parent().UnlinkChildNode(dn.Id())
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}
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}
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}
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