ASF GitHub Bot commented on FLINK-8360:

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

    --- Diff: 
    @@ -25,17 +25,24 @@
     import org.apache.flink.runtime.checkpoint.OperatorSubtaskState;
     import org.apache.flink.runtime.checkpoint.TaskStateSnapshot;
     import org.apache.flink.runtime.executiongraph.ExecutionAttemptID;
    +import org.apache.flink.runtime.jobgraph.JobVertexID;
     import org.apache.flink.runtime.jobgraph.OperatorID;
     import org.apache.flink.runtime.taskmanager.CheckpointResponder;
     import org.apache.flink.runtime.taskmanager.TestCheckpointResponder;
     import org.junit.Assert;
     import org.junit.Test;
    +import org.junit.rules.TemporaryFolder;
    +import java.io.IOException;
     import static org.mockito.Mockito.mock;
     public class TaskStateManagerImplTest {
    --- End diff --

> 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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