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Refactor node draining avoid racing condition
Utilize k8s leader election mechanism to prevent annotating nodes at the same time. The leader election mechanism requires the leader to keep updating the Lease object. But in our case, the node may reboot itself, then lose leadership. So I use a 2 layers lock here. The node can only start draining with 2 conditions: 1) it becomes the leader 2) no other node is draining which is indicated by the annotation.
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2 changes: 1 addition & 1 deletion
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vendor/golang.org/x/net/idna/tables12.00.go → vendor/golang.org/x/net/idna/tables12.0.0.go
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