Computer History Museum
这次去 Computer History Museum，体会到了对于计算量的需求远远早于电子计算机的发明，人们解决这一问题有很多发明。这次也很幸运看到了IBM 1401大型的演示过程。
Tag
Tech
2026-03 Time at ClickHouse
Back then in 2022, I was interested in learning how to build SaaS products on cloud infrastructure. I joined ClickHouse and spent three and a half years there, had a great time. Put down some notes of what I learned.
Database + Queue: Getting the Semantics Right
We often have a pattern of database writes combined with a message queue. But ensuring correctness is hard.
Parallelize ClickHouse aggregation merge for fixed hash map
The idea is simple but learned a lot of ClickHouse aggregation, so want to jot it down.
Cilium in EKS and VPC peering
I recently need to setup VPC peering across different EKS clusters. We use Cilium with routing-mode: native. When debugging connectivity issue I refreshed my understanding of how Cilium work in EKS and what needs to be configured in our cases.
eBPF LRU map cache trashing
A interesting exploration of eBPF LRU map
Readings about load balancing
Starting from eBPF use case, saw this CloudFlare Unimog Blog, a L4 TCP load balancer. Unimog solves very similar issue as I did in ClickHouse.