apache / apache/pulsar-client-cpp
[Bug] [ARM] Partially acknowledged batches are not redelivered
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Descrizione
### Search before asking
- [X] I searched in the [issues](https://github.com/apache/pulsar-client-cpp/issues) and found nothing similar.
### Version
Debian GNU/Linux 10 (buster), aarch64 (but the executable is arm32), pulsar-client-cpp 3.3.0
### Minimal reproduce step
1. Send a batch of events to the Pulsar broker (in our reproduction, it is a batch size of 309).
2. Receive these messages (we're using `pulsar::Consumer::receive` in a loop), while continuously acknowledging them asynchronously (acknowledgements are done using `pulsar::Consumer::acknowledge(const MessageId &messageId)`, where `messageId` is `pulsar::Message::getMessageId`).
3. Terminate the program during the middle of receiving a batch (we're terminating after having received and acknowledged the 190/309 events from a batch).
4. Resume the program.
### What did you expect to see?
All of the events in the batch re-sent.
### What did you see instead?
None of the events in the batch, _including the ones never received_ are re-sent.
### Anything else?
- We log the result of the acknowledgement in the callback method, which shows us that the most we've acknowledged is the `190th` message in a batch.
- Exclusive subscription.
- Running it on Gravitron2/3 processors.
- We've used the same broker and test with an x86_64 Pulsar 3.3.0 Pulsar client, and we've had no issues (RHEL8).
- We can actively see missing messages - we are just sending consecutive numbers and logging them. We're missing exactly 119, the amount remaining in the batch that we've not fully acknowledged.
- We've tried not immediately terminating - i.e. we stop receiving messages but continue to process any callbacks, to validate that we're just not seeing 119 callbacks missing, and nothing.
### Are you willing to submit a PR?
- [ ] I'm willing to submit a PR!
Guida per i contributori
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Direzione di ricerca
Start with the Consumer::receive loop and asynchronous Consumer::acknowledge path using Message::getMessageId, then reproduce the 309-event batch interruption on the ARM configuration described. Done means that after acknowledging only part of a batch and restarting, all batch events, including the unreceived remainder, are redelivered.
Scritto dal modello di indicizzazione a partire dal testo della issue.
Valutazione
- Stack tecnologico
- cpp
- Ambito
- distributed-systems
- Tipo di issue
- Bug
- Difficoltà
- 4/5
- Tempo stimato
- 3-5 giorni
- Stato di attività
- Ferma
- Chiarezza
- Abbastanza chiara
- Idoneità per principianti
- 35/100