[jira] [Created] (FLINK-5421) Explicit restore method in Snapshotable

[Shang Yuanchun (Jira)]

Stefan Richter created FLINK-5421:
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             Summary: Explicit restore method in Snapshotable
                 Key: FLINK-5421
                 URL: https://issues.apache.org/jira/browse/FLINK-5421
             Project: Flink
          Issue Type: Improvement
            Reporter: Stefan Richter
            Assignee: Stefan Richter


We should introduce an explicit {{restore(...)}} method to match the {{snapshot(...)}} method in this interface.

Currently, restore happens implicit in backends, i.e. when state handles are provided, backends execute restore logic in their constructors. This behaviour makes it hard for backends to participate in the task's lifecycle through {{CloseableRegistry}}, because we can only register backend objects after they have been constructed. As a result, for example, all restore operations that happen in the constructor are not responsive to cancelation.

When we introduce an explicit restore, we can first create a backend object, then register it, and only then run restore.



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