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From "Karthik Kambatla (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (S4-37) Emitters should allow registering a callback
Date Sat, 24 Dec 2011 04:00:30 GMT

    [ https://issues.apache.org/jira/browse/S4-37?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13175650#comment-13175650
] 

Karthik Kambatla commented on S4-37:
------------------------------------

Yes, all of this happens in the comm layer. But, we might want to support more complicated
protocols in the comm layer which themselves might use things like UDP and TCP.

So, I guess I am asking for simple protocols like TCP to support callbacks and not all Emitters.
But, I am not sure how we can enforce such a thing on particular emitters.

                
> Emitters should allow registering a callback
> --------------------------------------------
>
>                 Key: S4-37
>                 URL: https://issues.apache.org/jira/browse/S4-37
>             Project: Apache S4
>          Issue Type: New Feature
>    Affects Versions: 0.5
>            Reporter: Karthik Kambatla
>            Assignee: Karthik Kambatla
>             Fix For: 0.5
>
>
> In the current state, emitters (udp, tcp, and others) send the messages across. They
do not necessarily acknowledge the information regarding the send (success/failure) to the
calling layer.
> An ACK from the emitter is important to realize more complicated emitter/listener protocols.
For instance, to implement a ReplicationEmitter (the message is sent to multiple nodes instead
of one node, say for fault-tolerance), the message should be processed only after it is replicated
the required number of times. So, if we are using TCP as the underlying layer, it should callback
when the operation succeeds.
> I am eager to hear comments on (1) should we provision for complicated protocols? (2)
if so, is there any better way of going about things?

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