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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