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I implemented my own staking pallet, which implemented the SessionManager. And I pass it to pallet_session::Config.

I can confirm the session keys are set correctly.

If I stop the Alice node, then the Bob start to produce blocks.

Why Alice always get the authority to produce block?

Code: https://github.com/darwinia-network/darwinia-2.0/blob/xavier/staking/pallet/staking/src/lib.rs

  • There's not enough information here for people to help. Have you confirmed that the output of new_session for your pallet is correct? Have you checked the validators are correct? You can get them from a running chain via the explorer: Chain State > session > validators. Dec 5, 2022 at 16:55
  • Yes, they are correct. As I said if I stop Alice node, then Bob starts to produce blocks. Which means the keys are correct. Dec 5, 2022 at 16:56
  • What about the set of authorities used by aura? If the set of authorities from aura is [Alice, Bob], then both should be producing blocks equally, so there is more than likely an issue somewhere between your pallet and the set of aura authorities. Dec 5, 2022 at 17:18
  • I think they are correct. I put the code link in the question. Maybe you could find some issues? Dec 5, 2022 at 17:22
  • I read through the code in the link, and everything looks correct there. Are you making sure to wait 2 sessions before expecting a new set of authorities to take effect? You can check aura authorities on a running chain by Chain State > aura > authorities. If the aura authorities are correct (alice + bob) and bob can author blocks only when alice disconnects, that would imply an issue within / with aura setup or keys somehow. Dec 5, 2022 at 17:46

1 Answer 1


The slot duration in your runtime is wrong:

pub const MILLISECS_PER_BLOCK: u64 = 6_000;

You are running a parachain that can only produce a block every 12 seconds. You have set your slot time to 6 seconds. That means that you always skip Bob. Always when it is the turn of Bob, there is "no slot" in the relay chain to build a parachain block.

So, the solution is to set the following as slot duration:

pub const MILLISECS_PER_BLOCK: u64 = 12_000;

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