[jira] [Created] (FLINK-13803) Introduce SpillableHeapKeyedStateBackend and all necessities

[Shang Yuanchun (Jira)]

Yu Li created FLINK-13803:
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             Summary: Introduce SpillableHeapKeyedStateBackend and all necessities
                 Key: FLINK-13803
                 URL: https://issues.apache.org/jira/browse/FLINK-13803
             Project: Flink
          Issue Type: Sub-task
            Reporter: Yu Li


This JIRA aims at introducing a new {{SpillableHeapKeyedStateBackend}} which will reuse most code of the {{HeapKeyedStateBackend}} (probably the only difference is the spill-able one will register a {{HybridStateTable}}), and allow using it in {{FsStateBackend}} and {{MemoryStateBackend}} (only as an option, by default still {{HeapKeyedStateBackend}}) through configuration.

The related necessities include but are not limited to:
* A relative backend builder class
* Relative restore operation classes
* Necessary configurations for using spill-able backend

This should be the last JIRA after which the spill-able heap backend feature will become runnable regardless of the stability and performance.



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