Database / ValKey Interview questions

Which is better and why: Valkey Cluster or client-side sharding?

For most teams, built-in Valkey Cluster is the better default because resharding, slot migration, and failover are handled by the server itself, so application code doesn't need to know which physical node owns a given key.

Client-side sharding, where an application or library hashes keys across a set of independent standalone nodes, can still make sense for very custom sharding schemes or when integrating with infrastructure built before Cluster existed, but it pushes rebalancing and failover logic entirely into the application and doesn't enforce the same-slot guarantees Cluster gives multi-key operations via hash tags.

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A key advantage of built-in Valkey Cluster over client-side sharding is... guaranteed unlimited multi-key transactions across any keys

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server-managed resharding and failover without changing application code

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no need for replicas at all

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elimination of hash slots

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A common trade-off of client-side sharding is that... it requires exactly 16384 shards

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the application must handle rebalancing and failover logic itself

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it prevents using persistence

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it's only usable alongside Sentinel

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Database / ValKey Interview questions

Which is better and why: Valkey Cluster or client-side sharding?

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