| Class | Description | 
|---|---|
| EventHandler | Abstract base class for all HBase event handlers. | 
| ExecutorService | This is a generic executor service. | 
| ExecutorService.Executor | Executor instance. | 
| ExecutorService.ExecutorStatus | A snapshot of the status of a particular executor. | 
| ExecutorService.RunningEventStatus | The status of a particular event that is in the middle of being
 handled by an executor. | 
| ExecutorService.TrackingThreadPoolExecutor | A subclass of ThreadPoolExecutor that keeps track of the Runnables that
 are executing at any given point in time. | 
| Enum | Description | 
|---|---|
| EventType | List of all HBase event handler types. | 
| ExecutorType | The following is a list of all executor types, both those that run in the
 master and those that run in the regionserver. | 
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