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Date: Fri, 17 Jun 2016 15:46:05 +0000 (UTC)
From: "Andrew Chung (JIRA)" <jira@apache.org>
To: dev@reef.apache.org
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Subject: [jira] [Updated] (REEF-1453) GroupCommunication should create a new
 observer for each client
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archived-at: Fri, 17 Jun 2016 15:46:07 -0000


     [ https://issues.apache.org/jira/browse/REEF-1453?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Chung updated REEF-1453:
-------------------------------
    Summary: GroupCommunication should create a new observer for each client  (was: StreamingNetworkService should create a new observer for each client)

> GroupCommunication should create a new observer for each client
> ---------------------------------------------------------------
>
>                 Key: REEF-1453
>                 URL: https://issues.apache.org/jira/browse/REEF-1453
>             Project: REEF
>          Issue Type: Improvement
>          Components: REEF.NET
>            Reporter: Andrew Chung
>            Assignee: Andrew Chung
>              Labels: FT, breaking_change
>
> {{StreamingNetworkService}} currently only has one universal observer that handles connections for all incoming clients. This is inconvenient because when a client fails or disconnects, there is no easy way to propagate the failure/completion signal of the *specific* failed client up to the universal observer.
> A proposed solution is to instead allow the injection of a {{NetworkObserverFactory}}, which creates a new {{IObserver}} for each new client that is connected to the {{StreamingTransportServer}}. The {{NetworkObserverFactory}} itself will be wrapped in a universal observer registered of type {{IObserver<IRemoteMessage<T>>}} such that it receives a notification upon each new client. For each message, it will cast the {{IRemoteMessage.Identifier}} as a {{SocketRemoteIdentifier}}. If the {{IPEndpoint}} of the message has not been seen before, it will know that the message is from a new client and will create an {{IObserver}} for the new client and register the new client with the {{IPEndpoint}} with the {{ObserverContainer}}.
> The change is a simple migration from the original universal observer model in that state can still be shared between the {{IObserver}} s spun off by the {{NetworkObserverFactory}} by passing the shared state object into the constructor of the created {{IObserver}} s.



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