Apache HBase provides automatic failover on RegionServer crashes. When a RegionServer crashes, the HBase cluster and the data remain available. When a RegionServer crashes, all the regions on the RegionServer migrate to another RegionServer. The Master handles RegionServer failures by assigning the regions handled by the failed RegionServer to another RegionServer.
A RegionServer crash is different from an administrator stopping a RegionServer, which allows for the RegionServer to close the regions and shut down properly and for the Master to reassign the closed regions.
MTTR (Mean Time ...
