Jetpack: Consensus Made Generally Fast (OSDI '26)

The blog post reviews the paper 'Jetpack' from OSDI '26, which introduces a 1-RTT fast-path framework for leader-based consensus protocols. This approach allows for reduced latency in WAN deployments by implementing a shim layer that runs concurrent execution paths, though it incurs overhead due to duplicate logs. Despite potential inefficiencies, Jetpack shows promise in write-heavy scenarios, delivering significant latency reductions while maintaining linearizability. The post also discusses challenges related to leader elections and recovery in fast-path protocols.