Rename ACTIVATION_EXIT_DELAY to MAX_SEED_LOOKAHEAD for phase 1

configs/mainnet.yaml

@@ -60,7 +60,7 @@ SLOTS_PER_EPOCH: 64
 # 2**0 (= 1) epochs 6.4 minutes
 MIN_SEED_LOOKAHEAD: 1
 # 2**2 (= 4) epochs 25.6 minutes
-ACTIVATION_EXIT_DELAY: 4
+MAX_SEED_LOOKAHEAD: 4
 # 2**10 (= 1,024) slots ~1.7 hours
 SLOTS_PER_ETH1_VOTING_PERIOD: 1024
 # 2**13 (= 8,192) slots ~13 hours

configs/minimal.yaml

@@ -59,7 +59,7 @@ SLOTS_PER_EPOCH: 8
 # 2**0 (= 1) epochs
 MIN_SEED_LOOKAHEAD: 1
 # 2**2 (= 4) epochs
-ACTIVATION_EXIT_DELAY: 4
+MAX_SEED_LOOKAHEAD: 4
 # [customized] higher frequency new deposits from eth1 for testing
 SLOTS_PER_ETH1_VOTING_PERIOD: 16
 # [customized] smaller state

specs/core/0_beacon-chain.md

@@ -210,7 +210,7 @@ The following values are (non-configurable) constants used throughout the specif
 | `MIN_ATTESTATION_INCLUSION_DELAY` | `2**0` (= 1) | slots | 6 seconds |
 | `SLOTS_PER_EPOCH` | `2**6` (= 64) | slots | 6.4 minutes |
 | `MIN_SEED_LOOKAHEAD` | `2**0` (= 1) | epochs | 6.4 minutes |
-| `ACTIVATION_EXIT_DELAY` | `2**2` (= 4) | epochs | 25.6 minutes |
+| `MAX_SEED_LOOKAHEAD` | `2**2` (= 4) | epochs | 25.6 minutes |
 | `SLOTS_PER_ETH1_VOTING_PERIOD` | `2**10` (= 1,024) | slots | ~1.7 hours |
 | `SLOTS_PER_HISTORICAL_ROOT` | `2**13` (= 8,192) | slots | ~13 hours |
 | `MIN_VALIDATOR_WITHDRAWABILITY_DELAY` | `2**8` (= 256) | epochs | ~27 hours |
@@ -779,7 +779,7 @@ def compute_activation_exit_epoch(epoch: Epoch) -> Epoch:
     """
     Return the epoch during which validator activations and exits initiated in ``epoch`` take effect.
     """
-    return Epoch(epoch + 1 + ACTIVATION_EXIT_DELAY)
+    return Epoch(epoch + 1 + MAX_SEED_LOOKAHEAD)
 ```
 
 #### `compute_domain`

specs/core/1_custody-game.md

@@ -282,7 +282,7 @@ def ceillog2(x: uint64) -> int:
 ### `is_valid_merkle_branch_with_mixin`
 
 ```python
-def is_valid_merkle_branch_with_mixin(leaf: Hash, 
+def is_valid_merkle_branch_with_mixin(leaf: Hash,
                                       branch: Sequence[Hash],
                                       depth: uint64,
                                       index: uint64,
@@ -315,7 +315,7 @@ def legendre_bit(a: int, q: int) -> int:
     if a >= q:
         return legendre_bit(a % q, q)
     if a == 0:
-        return 0 
+        return 0
     assert(q > a > 0 and q % 2 == 1)
     t = 1
     n = q
@@ -602,7 +602,7 @@ def process_bit_challenge(state: BeaconState, challenge: CustodyBitChallenge) ->
     # Verify attestation is eligible for challenging
     responder = state.validators[challenge.responder_index]
     assert get_current_epoch(state) <= get_randao_epoch_for_custody_period(
-        get_custody_period_for_validator(state, challenge.responder_index, epoch), 
+        get_custody_period_for_validator(state, challenge.responder_index, epoch),
         challenge.responder_index
     ) + 2 * EPOCHS_PER_CUSTODY_PERIOD + responder.max_reveal_lateness
 
@@ -673,7 +673,7 @@ def process_chunk_challenge_response(state: BeaconState,
     # Verify bit challenge data is null
     assert response.chunk_bits_branch == [] and response.chunk_bits_leaf == Hash()
     # Verify minimum delay
-    assert get_current_epoch(state) >= challenge.inclusion_epoch + ACTIVATION_EXIT_DELAY
+    assert get_current_epoch(state) >= challenge.inclusion_epoch + MAX_SEED_LOOKAHEAD
     # Verify the chunk matches the crosslink data root
     assert is_valid_merkle_branch(
         leaf=hash_tree_root(response.chunk),

specs/validator/0_beacon-chain-validator.md

@@ -114,7 +114,7 @@ Once a validator has been processed and added to the beacon state's `validators`
 
 ### Activation
 
-In normal operation, the validator is quickly activated, at which point the validator is added to the shuffling and begins validation after an additional `ACTIVATION_EXIT_DELAY` epochs (25.6 minutes).
+In normal operation, the validator is quickly activated, at which point the validator is added to the shuffling and begins validation after an additional `MAX_SEED_LOOKAHEAD` epochs (25.6 minutes).
 
 The function [`is_active_validator`](../core/0_beacon-chain.md#is_active_validator) can be used to check if a validator is active during a given epoch. Usage is as follows:
 

test_libs/pyspec/eth2spec/test/phase_0/epoch_processing/test_process_registry_updates.py

@@ -21,7 +21,7 @@ def test_activation(spec, state):
     index = 0
     mock_deposit(spec, state, index)
 
-    for _ in range(spec.ACTIVATION_EXIT_DELAY + 1):
+    for _ in range(spec.MAX_SEED_LOOKAHEAD + 1):
         next_epoch(spec, state)
 
     yield from run_process_registry_updates(spec, state)
@@ -73,7 +73,7 @@ def test_ejection(spec, state):
     # Mock an ejection
     state.validators[index].effective_balance = spec.EJECTION_BALANCE
 
-    for _ in range(spec.ACTIVATION_EXIT_DELAY + 1):
+    for _ in range(spec.MAX_SEED_LOOKAHEAD + 1):
         next_epoch(spec, state)
 
     yield from run_process_registry_updates(spec, state)