[jira] [Closed] (FLINK-4490) Decouple Slot and Instance

["Stephan Ewen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-4490?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stephan Ewen closed FLINK-4490.
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> Decouple Slot and Instance
> --------------------------
>
>                 Key: FLINK-4490
>                 URL: https://issues.apache.org/jira/browse/FLINK-4490
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Distributed Coordination
>            Reporter: Kurt Young
>            Assignee: Stephan Ewen
>             Fix For: 1.2.0
>
>
> Currently, {{Slot}} and {{Instance}} holds each other. For {{Instance}} holding {{Slot}}, it makes sense because it reflects how many resources it can provide and how many are using. 
> But it's not very necessary for {{Slot}} to hold {{Instance}} which it belongs to. It only needs to hold some connection information and gateway to talk to. Another downside for {{Slot}} holding {{Instance}} is that {{Instance}} actually contains some allocate/de-allocation logicals, it will be difficult if we want to do some allocation refactor without letting {{Slot}} noticed. 
> We should abstract the connection information of {{Instance}} to let {{Slot}} holds. (Actually we have {{InstanceConnectionInfo}} now, but lacks of instance's akka gateway, maybe we can just adding the akka gateway to the {{InstanceConnectionInfo}})



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