Heron processing topologies can be written using an API called the Heron ECO API. The ECO API is currently available to work with spouts and bolts from the following packages:
org.apache.stormWe will expand compatibility based on feedback we get from the community.
Although this document focuses on the ECO API, both the Streamlet API and Topology API topologies you have built can still be used with Heron
Heron‘s ECO offers one major difference over the Streamlet and Topology APIs and that is extensibility without recompilation. With Heron’s ECO developers now have a way to alter the way data flows through spouts and bolts without needing to get into their code and make changes. Topologies can now be defined through a YAML based format.
/ˈekoʊ/ (Because all software should come with a pronunciation guide these days) ECO is an acronym that stands for: