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Open-Sourcing Rebalancer: A Generic, High-Performance Library for Solving Assignment Problems fb.com
Meta open‑sourced Rebalancer, a library that lets engineers describe assignment problems (objects → bins) via a high‑level spec API, then solves them with either a MIP backend or a highly parallel local‑search engine. It handles millions of objects, solves ~40 M problems daily, and includes a debugging UI.
Facebookfb.comRichard Barnes, Neeraj Kumar, Pol Mauri Ruiz13h8 minHN2
Inside Petal: Building the World’s First Petabit-Class Transoceanic Subsea Cable fb.com
Meta announced Petal, the first petabit-class transoceanic subsea cable, connecting France and the US over 7,000 km. It's the first to deploy multi-core fiber technology at scale, doubling capacity per fiber without a proportional increase in power or physical infrastructure.
Facebookfb.comElizabeth Rivera Hartling, Pascal Pecci, Matthew Mitchell17h6 minHN2

Open-Sourcing Rebalancer: A Generic, High-Performance Library for Solving Assignment Problemsfb.com