Supervisor (druid-server 27.0.0 API)

```
public interface Supervisor
```

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method and Description
`void`	`checkpoint(int taskGroupId, DataSourceMetadata checkpointMetadata)` The definition of checkpoint is not very strict as currently it does not affect data or control path.
`LagStats`	`computeLagStats()` Computes maxLag, totalLag and avgLag
`int`	`getActiveTaskGroupsCount()`
`default List<ParseExceptionReport>`	`getParseErrors()`
`SupervisorStateManager.State`	`getState()`
`default Map<String,Map<String,Object>>`	`getStats()`
`SupervisorReport`	`getStatus()`
`default Boolean`	`isHealthy()`
`void`	`reset(DataSourceMetadata dataSourceMetadata)`
`void`	`start()`
`void`	`stop(boolean stopGracefully)`

- Method Detail
  - start
```
void start()
```
  - stop
```
void stop(boolean stopGracefully)
```
    Parameters:
    
    stopGracefully - If true, supervisor will cleanly shutdown managed tasks if possible (for example signalling them to publish their segments and exit). The implementation may block until the tasks have either acknowledged or completed. If false, supervisor will stop immediately and leave any running tasks as they are.
  - getStatus
```
SupervisorReport getStatus()
```
  - getState
```
SupervisorStateManager.State getState()
```
  - getStats
```
default Map<String,Map<String,Object>> getStats()
```
  - getParseErrors
```
default List<ParseExceptionReport> getParseErrors()
```
  - isHealthy
```
@Nullable
default Boolean isHealthy()
```
  - reset
```
void reset(DataSourceMetadata dataSourceMetadata)
```
  - checkpoint
```
void checkpoint(int taskGroupId,
                DataSourceMetadata checkpointMetadata)
```
    The definition of checkpoint is not very strict as currently it does not affect data or control path. On this call Supervisor can potentially checkpoint data processed so far to some durable storage for example - Kafka/Kinesis Supervisor uses this to merge and handoff segments containing at least the data represented by DataSourceMetadata
    
    Parameters:
    
    taskGroupId - unique Identifier to figure out for which sequence to do checkpointing
    
    checkpointMetadata - metadata for the sequence to currently checkpoint
  - computeLagStats
```
LagStats computeLagStats()
```
    Computes maxLag, totalLag and avgLag
  - getActiveTaskGroupsCount
```
int getActiveTaskGroupsCount()
```

Interface Supervisor

Method Summary

Method Detail

start

stop

getStatus

getState

getStats

getParseErrors

isHealthy

reset

checkpoint

computeLagStats

getActiveTaskGroupsCount