public class MapReducerAggStateUpdater extends Object implements StateUpdater<MapState>
Constructor and Description |
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MapReducerAggStateUpdater(ReducerAggregator agg,
Fields groupFields,
Fields inputFields) |
Modifier and Type | Method and Description |
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void |
cleanup()
When running in local mode, called when the local cluster is being shut down.
|
void |
prepare(Map 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 conf, TridentOperationContext context)
Operation
prepare
in interface Operation
conf
- 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.TridentOperationContext
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