| 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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