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From kishore g <>
Subject Re: Information about Apache S4 and Helix
Date Mon, 02 Dec 2013 19:19:56 GMT
Work on S4 and Helix integration is here;a=shortlog;h=refs/heads/S4-110-new

Here is the JIRA

Kishore G

On Mon, Dec 2, 2013 at 8:47 AM, Sergio Vavassori <>wrote:

> Good morning,
> I have started using Apache S4 for a university project and I wanted to ask
> you some question about its architecture, mainly to be sure to do the
> modifications I need in the right way and to see if there is a cleaner and
> simpler one.
> It's my understanding that a cluster is a group of nodes and each node has
> the same application-code copy; this means that if I want to partition the
> ProcessingElements between nodes I need to group them in different
> clusters.
> So, mapping S4 elements into a "classical" Stream Processing naming (Nodes,
> Operators, Slides...), would be having one application (Operator) per
> cluster and configure the ProcessingElements as singleton (1 Slide per
> Node).
> About inter-cluster streaming:
> Is it possible to have broadcast stream between one cluster and all nodes
> of another cluster? Or should I re-implement RemoteSenders to do that? In
> this last case, is there a way to unbind Module mappring between interface
> and class used to resolve @inject?
> Is there a way to have that feature as per-stream configuration rather than
> all-stream cluster-wide?
> Is there any functional difference (or limitation) between "RemoteStreams"
> and "Streams" beyond the naming to recognize inter-cluster vs intra-cluster
> streaming?
> I saw there is an ongoing integration with helix project, which has a
> slightly different concept for partition since it can host more than one on
> the same node, but I couldn't find any example. Is there any work on it?
> Regards,
> Sergio Vavassori

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