Reviewed by Aditya Kumar · Last reviewed 2026-03-24
Architectural logic: Ordering is per partition key. Same key → same shard → ordered. Use consistent partition key (user_id, order_id) for causal ordering. Trade-off: Same key = potential hot partition. Best practice: Partition by entity ID; multiple keys for parallelism.
Architectural logic: Ordering is per partition key. Same key → same shard → ordered. Use consistent partition key (user_id, order_id) for causal ordering. Trade-off: Same key = potential hot partition. Best practice: Partition by entity ID; multiple keys for parallelism.
Red Flag: Random partition key when ordering matters. Pro-Move: 'We partition by order_id—all events for order are ordered; we use 10 shards for parallelism.'
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