Aljoscha Krettek closed FLINK-5421.
       Resolution: Fixed
    Fix Version/s: 1.2.0

Implemented on release-1.2 in:

> 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
>             Fix For: 1.2.0
> 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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