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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