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QUIC Transport for Seastar

1 post · Sep 2026

What this trail covers

ScyllaDB has integrated the QUIC transport protocol into its Seastar framework, aiming to mitigate TCP's head-of-line blocking and reduce handshake latency. This integration leverages the sans-I/O ngtcp2 library and adapts Seastar's RPC layer to run over QUIC, with benchmarks showing predictable performance on lossless networks and advantages when packet loss occurs. The integration focuses on user-space implementation and adapting Seastar's shared-nothing, per-core event loop architecture to QUIC.

All ScyllaDB trails
  1. Bringing QUIC to SeastarThis post details the integration of the QUIC transport protocol into the Seastar framework. It describes the motivation for using QUIC (mitigating TCP's head-of-line blocking and handshake latency), the challenges posed by Seastar's shared-nothing architecture, and the implementation details using the sans-I/O ngtcp2 library. The post also presents benchmark results comparing QUIC with TCP on loopback and packet-loss scenarios, highlighting QUIC's advantages in the latter.