August 2017
Beginner to intermediate
284 pages
6h 51m
English
Content preview from Mastering Apache Storm
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Aggregator
The Aggregator first runs the global repartitioning operation on the input stream to combine all the partitions of the same batch into a single partition, and then runs the aggregation function on each batch. By definition, the Aggregator looks very similar to the ReduceAggregator. The BaseAggregator<State> contains the following methods:
- init(Object batchId, TridentCollector collector): The init() method is called before starting the processing of a batch. This method returns the State object, which will be used to save the state of the batch. This object is used by the aggregate() and complete() methods.
- aggregate (State s, TridentTuple tuple, TridentCollector collector): This method iterates over each tuple of a given batch. ...
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