ASF GitHub Bot commented on FLINK-8360:

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

    --- Diff: 
    @@ -59,12 +59,18 @@ public void before() throws Exception {
                this.subtaskIdx = 0;
                this.rootDirs = new File[]{temporaryFolder.newFolder(), 
    +           LocalRecoveryDirectoryProviderImpl directoryProvider =
    +                   new LocalRecoveryDirectoryProviderImpl(rootDirs, jobID, 
allocationID, jobVertexID, subtaskIdx);
    +           LocalRecoveryConfig localRecoveryConfig =
    +                   new 
    --- End diff --
    So wouldn't that mean that with `LocalRecoveryConfig.disabled()`, the 
directory provider is again nullable? I think that 
`LocalRecoveryDirectoryProvider` is a very lightweight object, that also always 
has a useful default configuration.

> 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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