Class GroupedAggregator
- java.lang.Object
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- org.apache.storm.trident.operation.impl.GroupedAggregator
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- All Implemented Interfaces:
Serializable,Aggregator<Object[]>,Operation
public class GroupedAggregator extends Object implements Aggregator<Object[]>
- See Also:
- Serialized Form
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Constructor Summary
Constructors Constructor Description GroupedAggregator(Aggregator agg, Fields group, Fields input, int outSize)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description voidaggregate(Object[] arr, TridentTuple tuple, TridentCollector collector)voidcleanup()When running in local mode, called when the local cluster is being shut down.voidcomplete(Object[] arr, TridentCollector collector)Object[]init(Object batchId, TridentCollector collector)voidprepare(Map<String,Object> conf, TridentOperationContext context)Called when the `Operation` is first initialized.
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Constructor Detail
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GroupedAggregator
public GroupedAggregator(Aggregator agg, Fields group, Fields input, int outSize)
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Method Detail
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prepare
public void prepare(Map<String,Object> conf, TridentOperationContext context)
Description copied from interface:OperationCalled when the `Operation` is first initialized.- Specified by:
preparein interfaceOperation- Parameters:
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.- See Also:
TridentOperationContext
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init
public Object[] init(Object batchId, TridentCollector collector)
- Specified by:
initin interfaceAggregator<Object[]>
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aggregate
public void aggregate(Object[] arr, TridentTuple tuple, TridentCollector collector)
- Specified by:
aggregatein interfaceAggregator<Object[]>
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complete
public void complete(Object[] arr, TridentCollector collector)
- Specified by:
completein interfaceAggregator<Object[]>
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