Kubernetes scheduling and quota accounting · Observability · Cloud-native telecom
| CNCF DevStats | 2,005 |
| Merged upstream | 127 pull requests across 55 projects. 102 of them in 39 CNCF-hosted and Kubernetes-ecosystem repositories. |
| Kubernetes | GitHub org member |
| Governance | Nephio TSC member, LF Networking |
| OpenTelemetry | GitHub org member |
| Maintainer | M5Stack Platforms in upstream Zephyr, status: maintained |
| Community | Organizer of the O-RAN in B5G/6G track at COSCUP · I give technical talks in Taiwanese (Tâi-gí) |
Every merged contribution, listed and linked: open-source portfolio
The CNCF DevStats score updates daily via GitHub Actions; other figures as of July 2026.
I focus on correctness in Kubernetes Dynamic Resource Allocation (DRA), particularly quota arithmetic, allocator state management, and device lifecycle handling. A quota-accounting audit began with an int64 overflow in Kueue (#12896). It led to a four-PR Kueue hardening series (#12897, #12909, #12945, and #12954), followed by a corresponding overflow fix in Volcano (#5621).
In Kubernetes core, I identified and fixed five defects in the structured DRA allocator. All five fixes were merged for Kubernetes v1.37 with release notes: prevented cross-driver collisions by scoping shared-counter caches to both driver and pool (#140435); made candidate rejection and backtracking reliably roll back reserved allocator state (#140431); stopped counters from being charged twice for persisted shared-device allocations (#140437); rejected unusable validRange bounds before they could cause divide-by-zero or incorrect validation (#140666); rejected unrepresentable capacity requests instead of accepting allocations that a device could not satisfy (#140442).
Related upstream fixes include a claim-unprepare device leak in Intel's QAT DRA driver (#74) and a slice-bounds panic in the CNCF Container Device Interface parser (#321). Open work: a nil-dereference fix for KubeVirt's mediated-device builders (#18431) and an unlimited-quota sentinel bug in KAI-Scheduler's parent/child quota validation (#1881). Additional work is tracked through my open pull requests.
My next focus is lowering the barrier from using cloud-native software to contributing upstream: newcomer sessions in Mandarin and Taiwanese (Tâi-gí), together with bilingual contribution walkthroughs based on real review discussions. I completed LFC102: Inclusive Open Source Community Orientation in July 2026.
Website · Publications · Honors · ORCID · LinkedIn · LFX · Credly · hctsai@linux.com
Research assistant at National Yang Ming Chiao Tung University, Taiwan. Raised in a fishing village in Dapeng Bay, Pingtung. I care about making technical communities easier to enter, especially for people who do not start with an established professional network or English-first resources.





