[jira] [Commented] (REEF-1453) GroupCommunication should create a new observer for each client

["Andrew Chung (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/REEF-1453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15336338#comment-15336338 ] 

Andrew Chung commented on REEF-1453:
------------------------------------

I've repurposed this JIRA and will open sub-Tasks that need to be done. Thanks!

> 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
>
> {{GroupCommunication}} 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.
> Provided that each {{CommunicationGroupClient}} knows all its downstream nodes and can reverse-lookup the endpoints, the {{CommunicationGroupClient}} should only create an observer for each endpoint instead of using the universal observer.



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