DynamoDB hot partition throttling
Your DynamoDB-backed user-events table starts returning ProvisionedThroughputExceededException / throttling at 08:50 and your ingest pipeline's error rate climbs to 15%. CloudWatch shows ConsumedWriteCapacity flat at the provisioned ceiling while ThrottledRequests spikes. Interestingly, total table-level consumed capacity is below the provisioned total, but one partition is hot. A new feature began writing all events for a campaign under a single partition key (campaign_id) this morning. How do you triage and mitigate?
What a strong answer looks like
Stop the bleeding first (mitigate), then form hypotheses from real signals. Separate root cause from symptom, communicate status as you go, and close with what prevents a repeat.
0:00 of about 30 min
Which questions mattered is sealed until you submit. Telling you now would just be handing over the edge cases.
Run or narrate your approach, then ask the coach.