1. What did you do?
   Restore a workload with 190G, 6000 tables, according to the backup meta, there are about 42K files backed up.

2. What did you expect to see?
   Restore done, and the region count should be less than 42K (or we nearly must get empty regions), and the number of empty region should be a reasonable value.

3. What did you see instead?
   See figures below.

Figure 1. too many unhealthy regions

Figure 2. too many regions

4. What version of BR and TiDB/TiKV/PD are you using?

Nightly (2020-7-20)

5. Operation logs

(The log is too large to be updated... Too many write conflicts with crating tables concurrently...)