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https://issues.apache.org/jira/browse/S4-41?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthieu Morel updated S4-41:
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Fix Version/s: (was: 0.6)
> Guaranteed Event-Delivery
> -------------------------
>
> Key: S4-41
> URL: https://issues.apache.org/jira/browse/S4-41
> Project: Apache S4
> Issue Type: New Feature
> Affects Versions: 0.5.0
> Reporter: Karthik Kambatla
>
> From Skype call on 1/24:
> Guaranteed Event Delivery needs to be supported, but should be optional as it
> is bound to have significant performance trade-offs. Essentially, the Sender
> needs to be ACKed on successful/failed send of an event. In case of a failure
> or unknown status (timeout), the Sender re-sends the Event.
> Note: This JIRA is related to S4-37, the extent to which it is related needs
> to be decided.
> Should this be implemented at the application level (s4-core) or
> communication level (s4-comm)?
> -To implement it in the comm-layer, guaranteed message delivery (comm-layer)
> should translate to guaranteed event delivery (app-level). Receiver uses a
> blocking queue - thus, every message received is queued as an event (no
> messages are dropped) unless in case of interruptions. Also, we can modify
> Receiver to use a SynchronousQueue and have Listeners use ArrayBlockingQueue
> to make sure that no messages are dropped even in case of interruptions.
> -To implement it in the application-level, the Receiver should send an ACK to
> the Sender. This entails the following (1) Receiver should know the Sender
> details, (2) a special ACKEvent, (3) direct hand-shake between the Sender
> and Receiver (like implementing our own TCP).
> Given these circumstances, I feel the best way to achieve this is to (1)
> guarantee message-delivery, and (2) ensure that translates to guaranteed
> event-delivery.
> Please comment.
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