I would encourage you to join the vitess slack channel and let them know of any issues you run into there. Resharding has successfully been done at massive scale, so its unlikely that the system can't handle the load. Here is the blog post from when Github re-sharded live under full github load https://github.blog/2021-09-27-partitioning-githubs-relation...
Thanks, I'll pass along to my infrastructure team. Glancing through the blog post, its quite light on details, and I wonder if we just have a very different data load pattern.
Our dataset size is actually reasonably small (10s of TB), but our transaction throughput is very high. Glancing at our dashboard, baseline is 250k/s, with sustained daytime load in the 500k/s region.
