Steps to reproduce are as follows:
1. Create a table
2. Take a snapshot for the table
3. Load data to the table
4. Split regions of the table
5. Restore the table from the snapshot
The number of Offline Regions is as follows:
The number of Offline Regions should be zero.
It seems like when regions are removed by restoring a snapshot, the number of Offline Regions becomes wrong. And as far as I reviewed the code, it seems like the Offline Regions will not be cleaned up. After restarting Master, the offline regions disappear.