vitess introduces risk cross_shard_query

vitessIntroduces Riskcross shard query degradation

Source: Technology·Target: Failure Mode

Summary

Vitess enables MySQL sharding but cross-shard queries (queries without the shard key) require scatter-gather execution across all shards, with latency proportional to shard count.

Evidence

·vitess: a scatter query on a 20-shard cluster turns a 5ms query into 100ms+; VTGate becomes the merge bottleneck (technologies/vitess.yaml known_failure_modes)
·cross_shard_query_degradation lists vitess in affects_technologies (failure_modes/cross_shard_query_degradation.yaml)

Evidence grounding

Grounded, 2 supporting items

Vitess scatter queries without the sharding key fan out to all shards and merge in VTGate.