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Just a clarification, suppose that the pallet_session::rotate_session is not able to retrieve the next validation set due to an election failure inside the pallet_staking::new_session function. Is then the current validation set re-used to solve the problem of missing validators? Is it possible also that such failure arise when the election_multi_phase pallet doesn’t complete an offline election process?

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Is then the current validation set re-used to solve the problem of missing validators?

Correct.

Is it possible also that such failure arise when the election_multi_phase pallet doesn’t complete an offline election process?

Yes, and in fact, if type ElectionProvider of pallet_staking::Config is set to an instance of election_multi_phase, then it is election_multi_phase that is first failing, possible in the offline election process, then staking is notified, and the same failure is finally passed down to pallet_sesion on new_session .

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  • thanks, very helpful
    – mr_bovo
    Oct 25, 2022 at 13:33

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