The docs (Create TiFlash Replicas | PingCAP Docs) say “It is recommended that you do not replicate more than 1,000 tables because this lowers the PD scheduling performance. This limit will be removed in later versions.”
I’m wondering how significant the impact is, particularly as the number of tables grows well beyond that limit (say 10k - 30k tables of all sizes from 0 K to 200 G).
Are we talking 5% - 10% slower or grinding to a halt? I’m just looking for a guess based on other peoples experiences since I’m sure it will vary based on dataset, hardware, topology, etc.
Any info / update / timeline on removing or lessening that impact?
Servers have 12 cores, 64 GB of RAM, and 4 TB NVME SSDs.