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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Low latency and stateful processing
Apex is a native streaming architecture. As previously discussed, this allows processing of events as soon as they arrive without artificial delay, which enables real-time use cases with very low latency. Another important capability is stateful processing. Windowing may require a potentially very large amount of computational state. However, state also needs to be tracked in connectors for correct interaction with external systems. For example, the Apex Kafka connector will keep track of partition offsets as part of its checkpointed state so that it can correctly resume consumption after recovery from failure. Similarly, state is required for reading from files and other sources. For sources that don't ...
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