Scaling & Partitioning
Statelessness, sharding, consistent hashing, replication, hot spots, and multi-region.
0 / 28 solved
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Vertical, Horizontal & Statelessness
Scaling up vs out, stateless services, where state lives, and autoscaling signals.
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Sharding Strategies & Shard Keys
Range, hash, directory, and geo sharding, shard keys, cross-shard queries, and resharding.
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Consistent Hashing & Rebalancing
Hash rings, virtual nodes, key movement on membership changes, rendezvous hashing, and jump hash.
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Replication Topologies & Lag
Single-leader, multi-leader, and leaderless replication, sync modes, replication lag, and failover.
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Hot Partitions & The Celebrity Problem
Hot shards, key salting, celebrity accounts, and detecting hot keys.
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Multi-Region & Geo-Distribution
Active-passive vs active-active, cross-region latency, data residency, conflict resolution, and traffic steering.
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28 of 28 questions here are still unsolved.