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From "Matthieu Morel (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (S4-22) Adaptor
Date Fri, 08 Jun 2012 10:53:22 GMT

    [ https://issues.apache.org/jira/browse/S4-22?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13291680#comment-13291680
] 

Matthieu Morel commented on S4-22:
----------------------------------

S4-22 branch now adresses the requirements for create adapters that can send events to S4
applications. Adapters are actually S4 applications, as suggested in the initial proposal.
They send events to interested apps by using a pub/sub mechanism, described in https://issues.apache.org/jira/secure/attachment/12531387/Inter%20cluster%20communication%20in%20S4%20piper.pdf

We also wrote a walkthrough that uses current code in S4-22 : https://cwiki.apache.org/confluence/display/S4/S4+piper+walkthrough

At this point, S4-22 is much more advanced than the main piper branch (there were really a
lot of changes involved), and applications can be built with it. I think we should move forward
and merge this branch into the main piper branch.

Once it is merged, any issue/improvement can then be adressed through new tickets, but at
least we can move on.

Please vote on that proposal!
                
> Adaptor
> -------
>
>                 Key: S4-22
>                 URL: https://issues.apache.org/jira/browse/S4-22
>             Project: Apache S4
>          Issue Type: Improvement
>    Affects Versions: 0.5
>            Reporter: Leo Neumeyer
>            Assignee: Matthieu Morel
>             Fix For: 0.5
>
>         Attachments: Inter cluster communication in S4 piper.pdf, s4-subclusters.pdf
>
>
> Need an adaptor for v0.5
> Idea I posted earlier:
> What do you think of this idea for a simple adaptor:
> - Adaptor extends App
> - Adaptor can send events but not receive (for now)
> - Adaptor is deployed as a regular App to the S4 cluster and as an
> Adaptor type  in a host (separate from the S4 cluster).
> - Adaptor, unlike regular apps, can accept event data (in any format)
> directly, not via comm layer.
> - Input data is transformed into S4 events using a modular approach
> and by providing standard modules such as JSON.
> - Output events are exposed using EventSource and consumed by other
> apps without even knowing that they are Adaptors (only the App type is
> exposed in the cluster).
> - S4 events can be processed locally using PEs and Streams as usual.
> (We kind of need to get a local Sender for the local PEs and a
> standard cluster Sender for the EventSource object.)
> So why this approach?
> The GOOD:
> - Seems to be the least disruptive way to inject external events
> - Apps can easily consume the events in a modular way without any
> dependencies. Getting events from an adaptor or from another app is
> identical.
> - The adaptor would be packaged and deployed to the cluster as if it
> was an App (no incremental cost)
> - The adaptor can do preprocessing using the same programming model
> and can reuse PEs.
> The CHALLENGE:
> -  We need to also deploy the Adaptor in a separate host. On the other
> hand, this is inevitable. At least we use the same approach instead of
> creating a different system.
> -  The Adaptor will need to be integrated with ZK to get the physical addresses.
> -  We need to deal with two senders.
> for later: two-way communication and adapter clusters.
> thoughts?

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