ASF GitHub Bot commented on FLINK-8360:

Github user StefanRRichter commented on a diff in the pull request:

    --- Diff: 
    @@ -60,4 +62,9 @@ void reportTaskStateSnapshots(
         * @return previous state for the operator. Null if no previous state 
        OperatorSubtaskState operatorStates(OperatorID operatorID);
    +   /**
    +    * Returns the base directory for all file-based local state of the 
owning subtask.
    +    */
    +   File getSubtaskLocalStateBaseDirectory();
    --- End diff --
    This is the manager, not the state objects. So for local recovery that is 
not based on local files, the backend will just not care about directories and 
no invoke this method.

> Implement task-local state recovery
> -----------------------------------
>                 Key: FLINK-8360
>                 URL: https://issues.apache.org/jira/browse/FLINK-8360
>             Project: Flink
>          Issue Type: New Feature
>          Components: State Backends, Checkpointing
>            Reporter: Stefan Richter
>            Assignee: Stefan Richter
>            Priority: Major
>             Fix For: 1.5.0
> This issue tracks the development of recovery from task-local state. The main 
> idea is to have a secondary, local copy of the checkpointed state, while 
> there is still a primary copy in DFS that we report to the checkpoint 
> coordinator.
> Recovery can attempt to restore from the secondary local copy, if available, 
> to save network bandwidth. This requires that the assignment from tasks to 
> slots is as sticky is possible.
> For starters, we will implement this feature for all managed keyed states and 
> can easily enhance it to all other state types (e.g. operator state) later.

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