August 2017
Beginner to intermediate
284 pages
6h 51m
English
Content preview from Mastering Apache Storm
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aggregate
The aggregate works on each batch. During the aggregate process, the tuples are first repartitioned using the global operation to combine all the partitions of the same batch into a single partition and then the aggregation function is run on each batch. Here is a piece of code that shows how we can use aggregate:
mystream.aggregate(new Fields("x"), new Count() ,new new Fields("count"))
There are three types of aggregator interface available in Trident:
- ReducerAggregator
- Aggregator
- CombinerAggregator
These three aggregator interfaces can also be used with partitionAggregate.
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