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Remove exit counts 

* Simplify by removing `exit_epoch` in `BeaconState` and `Validator`. (Also less storage for full nodes.)
* Replace with `exit_epoch` when ordering validator with withdrawal. Slight loss of granularity, but that's actually a good thing because it reduces the opportunity for manipulation by proposers.
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Justin 2019-01-30 06:43:02 -08:00 committed by GitHub
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commit 5889e9c6db
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10
specs/core/0_beacon-chain.md
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@ -486,7 +486,6 @@ The following data structures are defined as [SimpleSerialize (SSZ)](https://git
'validator_registry': [Validator],
'validator_balances': ['uint64'],
'validator_registry_update_epoch': 'uint64',
'validator_registry_exit_count': 'uint64',
# Randomness and committees
'latest_randao_mixes': ['bytes32'],
@ -533,8 +532,6 @@ The following data structures are defined as [SimpleSerialize (SSZ)](https://git
'withdrawal_epoch': 'uint64',
# Epoch when validator was penalized
'penalized_epoch': 'uint64',
# Exit counter when validator exited
'exit_count': 'uint64',
# Status flags
'status_flags': 'uint64',
}
@ -1199,7 +1196,6 @@ def process_deposit(state: BeaconState,
exit_epoch=FAR_FUTURE_EPOCH,
withdrawal_epoch=FAR_FUTURE_EPOCH,
penalized_epoch=FAR_FUTURE_EPOCH,
exit_count=0,
status_flags=0,
)
@ -1246,9 +1242,6 @@ def exit_validator(state: BeaconState, index: ValidatorIndex) -> None:
return
validator.exit_epoch = get_entry_exit_effect_epoch(get_current_epoch(state))
state.validator_registry_exit_count += 1
validator.exit_count = state.validator_registry_exit_count
```
#### `penalize_validator`
@ -1412,7 +1405,6 @@ def get_initial_beacon_state(initial_validator_deposits: List[Deposit],
validator_registry=[],
validator_balances=[],
validator_registry_update_epoch=GENESIS_EPOCH,
validator_registry_exit_count=0,
# Randomness and committees
latest_randao_mixes=[ZERO_HASH for _ in range(LATEST_RANDAO_MIXES_LENGTH)],
@ -1968,7 +1960,7 @@ def process_penalties_and_exits(state: BeaconState) -> None:
all_indices = list(range(len(state.validator_registry)))
eligible_indices = filter(eligible, all_indices)
sorted_indices = sorted(eligible_indices, key=lambda index: state.validator_registry[index].exit_count)
sorted_indices = sorted(eligible_indices, key=lambda index: state.validator_registry[index].exit_epoch)
withdrawn_so_far = 0
for index in sorted_indices:
prepare_validator_for_withdrawal(state, index)