558160702b
Fixes #28769 Use case for this is if you have a sequence of elements that has been partitioned across multiple streams, and you want to merge them back together in order. It will typically be used in combination with `zipWithIndex` to define the index for the sequence, followed by a `Partition`, followed by the processing of different substreams with different flows (each flow emitting exactly one output for each input), and then merging with this stage, using the index from `zipWithIndex`. A more concrete use case is if you're consuming messages from a message broker, and you have a flow that you wish to apply to some messages, but not others, you can partition the message stream according to which should be processed by the flow and which should bypass it, and then bring the elements back together acknowledgement. If an ordinary merge was used rather than this, the messages that bypass the processing flow would likely overtake the messages going through the processing flow, and the result would be out of order offset acknowledgement which would lead to dropping messages on failure. I've included a minimal version of the above example in the documentation. |
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Akka 
We believe that writing correct concurrent & distributed, resilient and elastic applications is too hard. Most of the time it's because we are using the wrong tools and the wrong level of abstraction.
Akka is here to change that.
Using the Actor Model we raise the abstraction level and provide a better platform to build correct concurrent and scalable applications. This model is a perfect match for the principles laid out in the Reactive Manifesto.
For resilience, we adopt the "Let it crash" model which the telecom industry has used with great success to build applications that self-heal and systems that never stop.
Actors also provide the abstraction for transparent distribution and the basis for truly scalable and fault-tolerant applications.
Learn more at akka.io.
Reference Documentation
The reference documentation is available at doc.akka.io, for Scala and Java.
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Contributions are very welcome!
If you see an issue that you'd like to see fixed, the best way to make it happen is to help out by submitting a pull request implementing it.
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Akka is Open Source and available under the Apache 2 License.