32f0936d17
Reproducer (TransportFailSpec):
* watch from first to second node, i.e. sys msg with seq number 1
* trigger transport failure detection to tear down the connection
* the bug was that on the second node the ReliableDeliverySupervisor
was stopped because the send buffer had not been used on that side,
but that removed the receive buffer entry
* later, after gating elapsed another watch from first to second node,
i.e. sys msg with seq number 2
* when that watch msg was received on the second node the receive buffer
had been cleared and therefore it thought that seq number 1 was missing,
and therefore sent nack to the first node
* when first node received the nack it thrown
IllegalStateException: Error encountered while processing system message
acknowledgement buffer: [2 {2}] ack: ACK[2, {1, 0}]
caused by: ResendUnfulfillableException: Unable to fulfill resend request since
negatively acknowledged payload is no longer in buffer
This was fixed by not stopping the ReliableDeliverySupervisor so that the
receive buffer was preserved.
Not necessary for fixing the issue, but the following config settings were adjusted:
* increased transport-failure-detector timeout to avoid tearing down the
connection too early
* reduce the quarantine-after-silence to cleanup ReliableDeliverySupervisor
actors earlier
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|---|---|---|
| akka-actor | ||
| akka-actor-tests | ||
| akka-agent | ||
| akka-bench-jmh | ||
| akka-camel | ||
| akka-cluster | ||
| akka-cluster-metrics | ||
| akka-cluster-sharding | ||
| akka-cluster-tools | ||
| akka-contrib | ||
| akka-distributed-data | ||
| akka-docs | ||
| akka-multi-node-testkit | ||
| akka-osgi | ||
| akka-persistence | ||
| akka-persistence-query | ||
| akka-persistence-shared | ||
| akka-persistence-tck | ||
| akka-protobuf | ||
| akka-remote | ||
| akka-remote-tests | ||
| akka-slf4j | ||
| akka-ssl-config/src/main/scala/com/lightbend/sslconfig/akka | ||
| akka-stream | ||
| akka-stream-testkit | ||
| akka-stream-tests | ||
| akka-stream-tests-tck | ||
| akka-testkit | ||
| akka-typed | ||
| akka-typed-testkit | ||
| akka-typed-tests | ||
| project | ||
| scripts | ||
| src/main/ls | ||
| .gitignore | ||
| .java-version | ||
| build.sbt | ||
| CONTRIBUTING.md | ||
| COPYING.protobuf | ||
| LICENSE | ||
| README.md | ||
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.
Community
You can join these groups and chats to discuss and ask Akka related questions:
- Mailing list:
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In addition to that, you may enjoy following:
- The news section of the page, which is updated whenever a new version is released
- The Akka Team Blog
- @akkateam on Twitter
- Questions tagged #akka on StackOverflow
- Projects built with Akka:
Contributing
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.
Refer to the CONTRIBUTING.md file for more details about the workflow, and general hints on how to prepare your pull request. You can also ask for clarifications or guidance in GitHub issues directly, or in the akka/dev chat if a more real time communication would be of benefit.
A chat room is available for all questions related to developing and contributing to Akka:
License
Akka is Open Source and available under the Apache 2 License.