| Class | Description | 
|---|---|
| ReportWorkerHeartbeats | Runnable reporting local worker reported heartbeats to master, supervisor should take care the of the heartbeats integrity for the master heartbeats recovery, a non-null node id means that the heartbeats are full, and master can go on to check and wait others nodes when doing a heartbeats recovery. | 
| SupervisorHealthCheck | |
| SupervisorHeartbeat | |
| SynchronizeAssignments | A runnable which will synchronize assignments to node local and then worker processes. | 
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