public class MapReducerAggStateUpdater extends Object implements StateUpdater<MapState>
| Constructor and Description |
|---|
MapReducerAggStateUpdater(ReducerAggregator agg,
Fields groupFields,
Fields inputFields) |
| Modifier and Type | Method and Description |
|---|---|
void |
cleanup()
When running in local mode, called when the local cluster is being shut down.
|
void |
prepare(Map<String,Object> conf,
TridentOperationContext context)
Called when the
Operation is first initialized. |
void |
updateState(MapState map,
List<TridentTuple> tuples,
TridentCollector collector) |
public MapReducerAggStateUpdater(ReducerAggregator agg, Fields groupFields, Fields inputFields)
public void updateState(MapState map, List<TridentTuple> tuples, TridentCollector collector)
updateState in interface StateUpdater<MapState>public void prepare(Map<String,Object> conf, TridentOperationContext context)
OperationCalled when the Operation is first initialized.
prepare in interface Operationconf - the Storm configuration mapcontext - the operation context which provides information such as the number of partitions in the stream, and the current partition index. It also provides methods for registering operation-specific metrics.TridentOperationContextCopyright © 2021 The Apache Software Foundation. All rights reserved.