I've got a 0.9.12 westend-local relay chain with 4 authorities Alice, Charlie, Bob and Dave. My goal is to do a runtime upgrade to reduce EPOCH_DURATION_IN_SLOTS to let's say 1 minute instead of 1 hour.
However I'm getting the following error babe: Error with block built on 0x...: ClientImport("Unexpected epoch change")
Is it possible to reduce this parameter without breaking the chain ? Still trying to make sense of the associated code https://github.com/paritytech/substrate/blob/master/client/consensus/babe/src/lib.rs#L1500
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The error message indeed indicates that you can't change this once launched, but I am not sure. – kianenigma Dec 01 '21 at 10:35
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It is currently not possible to change this without restarting the chain: https://github.com/paritytech/substrate/blob/b6a3ecc150040daa440637ac892265165f3450f6/frame/babe/src/lib.rs#L124-L128.
kianenigma
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