Partitions, Sharding, and Split-for-Heat in DynamoDB

DynamoDB starts to grumble when a single partition gets hit with more than 1,000 WCU. To dodge throttling, writes need to fan out across shards.

Recommended move: start with 10 logical shards. Watch CloudWatch metrics. Dial N up or down. Let burst and adaptive capacity buy you breathing room - until Split-for-Heat kicks in and shuffles partitions.