November 2017
Beginner to intermediate
290 pages
7h 34m
English
book
Learning Apache Apex
by Ananth Gundabattula, Thomas Weise, Munagala V. Ramanath, David Yan, Kenneth Knowles
Content preview from Learning Apache Apex
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Sample application for dynamic partitioning
In this section, we will take a detailed look at an example application that illustrates the use of dynamic partitioning of an operator. It uses an input operator that generates random numbers and outputs them to a DevNull library operator (which, as the name suggests, simply discards them). The input operator starts out with two partitions; after some tuples have been processed, a dynamic repartition is triggered via the StatsListener interface discussed above to increase the number of partitions to four. The source code is available at the following link: https://github.com/apache/apex-malhar/tree/master/examples/dynamic-partition.
The populateDAG() method is, as expected, very simple:
@Override ...
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