| Class | Description | 
|---|---|
| CloseMetaHandler | Handles closing of the root region on a region server. | 
| CloseRegionHandler | Handles closing of a region on a region server. | 
| FinishRegionRecoveringHandler | |
| OpenMetaHandler | Handles opening of a meta region on a region server. | 
| OpenPriorityRegionHandler | Handles opening of a high priority region on a region server. | 
| OpenRegionHandler | Handles opening of a region on a region server. | 
| ParallelSeekHandler | Handler to seek storefiles in parallel. | 
| RegionReplicaFlushHandler | HBASE-11580: With the async wal approach (HBASE-11568), the edits are not persisted to wal in
 secondary region replicas. | 
| WALSplitterHandler | Handles log splitting a wal | 
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