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

[Shang Yuanchun (Jira)]

Kurt Young created FLINK-4490:
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             Summary: Decouple Slot and Instance
                 Key: FLINK-4490
                 URL: https://issues.apache.org/jira/browse/FLINK-4490
             Project: Flink
          Issue Type: Sub-task
            Reporter: Kurt Young


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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