high_throughput_oltp vulnerable to hot_shard_unbalanced

high throughput oltpVulnerable Tohot shard unbalanced writes

Source: Workload·Target: Failure Mode

Summary

High-throughput OLTP workloads are vulnerable to hot shard problems when the shard key is a sequential ID or timestamp, concentrating all new writes on the highest-range shard.

Evidence

·hot_shard_unbalanced_writes triggers on sequential/timestamp shard keys for write-heavy workloads (failure_modes/hot_shard_unbalanced_writes.yaml)
·high_throughput_oltp peaks at 25k rps with a 5x spike multiplier (workloads/high_throughput_oltp.yaml)

Evidence grounding

Grounded, 2 supporting items

High write rates on a monotonic shard key concentrate all writes on the current shard.