Tencent Cloud Middleware

Jul 20, 2023 · Operations

Why CKafka Cross‑Region Sync Stalled at 64KB/s: TCP Window Scaling & Kernel Tuning

This article details a real‑world investigation of severe latency in CKafka cross‑region data synchronization, tracing the issue from high message backlog through network bandwidth tests, kernel parameter adjustments, and finally uncovering a TCP window‑scaling failure caused by SYN‑cookie protection and missing timestamp options.