dynamodb vulnerable to hot_shard_unbalanced

dynamodbVulnerable Tohot shard unbalanced writes

Source: Technology·Target: Failure Mode

Summary

DynamoDB partitions data by partition key hash; sequential or low-cardinality partition keys cause hot partitions that exceed per-partition throughput limits and receive 400 ProvisionedThroughputExceededException responses.

Evidence

·dynamodb documents partition throttling when hot keys exceed 3000 RCU / 1000 WCU, surfacing as ProvisionedThroughputExceededException (technologies/dynamodb.yaml)
·hot_shard_unbalanced_writes lists dynamodb in affects_technologies; monotonic/sequential keys send all writes to the current shard (failure_modes/hot_shard_unbalanced_writes.yaml)

Evidence grounding

Grounded, 2 supporting items

Monotonic partition keys concentrate writes past DynamoDB's per-partition throughput ceiling.