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def consistent_hashing_same_allocations( | |
n: int, | |
urls: List[str], | |
ch_cls: ConsistentHashing, | |
) -> float: | |
ch = ch_cls(server_ids={random_str() for _ in range(n)}) | |
allocs = {url: ch.key_lookup(key=url) for url in urls} | |
ch.add_server(server_id=random_str()) | |
return sum( | |
allocs[url] == ch.key_lookup(key=url) |
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def update_server( | |
self, | |
server_id: ServerId, | |
token_count: int, | |
) -> None: | |
if token_count < 1: | |
raise ValueError( | |
f"make sure that token_count >= 1" | |
) | |
self._remove_server_tokens(server_id=server_id) |
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class ConsistentHashingWithTokens: | |
def __init__( | |
self, | |
server_tokens: Dict[ServerId, int], | |
seed: int = SEED, | |
): | |
assert all(tokens >= 1 for tokens in server_tokens.values()) | |
self._seed = seed | |
self._server_tokens = server_tokens | |
self._update_token_hashes() |
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