can't update node condition

[WIZARD-CXY]

Hi, I deployed npd yesterday in my k8s 1.6, Now I find it can't update node condition.Below is its log

E0418 09:48:32.826374       7 manager.go:160] failed to update node conditions: Operation cannot be fulfilled on nodes "cs55": there is a meaningful conflict (firstResourceVersion: "881081", currentResourceVersion: "881106"):
 diff1={"metadata":{"resourceVersion":"881106"},"status":{"conditions":[{"lastHeartbeatTime":"2017-04-18T01:48:32Z","type":"DiskPressure"},{"lastHeartbeatTime":"2017-04-18T01:47:32Z","type":"KernelDeadlock"},{"lastHeartbeatTime":"2017-04-18T01:48:32Z","type":"MemoryPressure"},{"lastHeartbeatTime":"2017-04-18T01:48:32Z","type":"OutOfDisk"},{"lastHeartbeatTime":"2017-04-18T01:48:32Z","type":"Ready"}]}}
, diff2={"status":{"conditions":[{"lastHeartbeatTime":"2017-04-18T01:48:32Z","lastTransitionTime":"2017-04-17T09:10:43Z","message":"kernel has no deadlock","reason":"KernelHasNoDeadlock","status":"False","type":"KernelDeadlock"}]}}

I wonder why this happen? @Random-Liu thx

[Random-Liu]

@WIZARD-CXY Do you constantly see this error or only several times?

This error is normal. In a Kubernetes cluster, there are several components updating the same node object, kubelet, node problem detector, node controller etc.

Conflict may happen because of the unavoidable race. However, this should be rare and NPD will retry after the conflict. If you only see this several times, it should be fine.

[WIZARD-CXY]

got it thx