hard20 pts · first answer countsdistributed-systemsconsensus

Two leaders after a GC pause

A worker holding a leader lease in etcd paused for 40 s in garbage collection. Its lease expired, a new leader was elected, and then the old worker woke up and wrote to storage, corrupting data. What prevents this?

A.Make the lease longer than any possible pauseB.Use fencing tokens: each new lease gets a higher number and storage rejects writes with an older tokenC.Check the lease once before starting the jobD.Run the leader on a bigger machine

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Two leaders after a GC pause

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