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https://issues.apache.org/jira/browse/FLINK-5421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15820882#comment-15820882
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Aljoscha Krettek commented on FLINK-5421:
-----------------------------------------
Implemented on master in:
aaf8e09d8f9ee7f04cb79d317e3122282153858c
499aea0d834ad8e8ef34fb80ffd89b6482062e37
> 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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