No. One key can still concentrate work on its owner.

Choose partition keys from common queries and write distribution. Range partitioning preserves locality but can create moving hot ranges; hashing spreads keys but complicates ordered range queries. Consistent hashing reduces which key ranges change owners when nodes change, while virtual nodes can improve distribution statistically. Neither solves a hot key or cross-shard transaction by itself. Plan resharding, ownership metadata, replication per shard, and operational visibility. Python’s process-randomized hash is not a stable distributed routing choice.

What the function promises: The model uses SHA-256 tokens and deterministic virtual nodes to select an owner. It does not migrate data or coordinate membership changes.

from hashlib import sha256
from bisect import bisect_left

def stable_hash(value):
    return int.from_bytes(sha256(value.encode()).digest()[:8], "big")

class HashRing:
    def __init__(self, servers, virtual_nodes=16):
        if not servers or virtual_nodes < 1:
            raise ValueError("Need servers and virtual nodes")
        self.tokens = sorted((stable_hash(f"{server}:{i}"), server)
                             for server in set(servers)
                             for i in range(virtual_nodes))
        self.positions = [position for position, _ in self.tokens]
    def owner(self, key):
        index = bisect_left(self.positions, stable_hash(key))
        return self.tokens[index % len(self.tokens)][1]

ring = HashRing(["A", "B"])
assert ring.owner("note-7") in {"A", "B"}
assert ring.owner("note-7") == HashRing(["B", "A"]).owner("note-7")
assert HashRing(["only"]).owner("anything") == "only"

Work and storage: O(Sv log(Sv)) ring construction and O(log(Sv)) lookup for S servers and v virtual nodes each.

When to recognize it: Consistent hashing assigns a key to the next token on a ring. Virtual nodes spread each server across several ranges.

Check before applying it: Balanced key ownership is not balanced traffic, and routing changes are not data migration.

No. Consider replication for reads, caching, splitting the logical workload, or a special hot-key path while preserving its consistency requirements.