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https://issues.apache.org/jira/browse/FLINK-8360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16313146#comment-16313146
 ] 

ASF GitHub Bot commented on FLINK-8360:
---------------------------------------

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

    https://github.com/apache/flink/pull/5239#discussion_r159863616
  
    --- Diff: 
flink-contrib/flink-storm/src/test/java/org/apache/flink/storm/wrappers/BoltWrapperTest.java
 ---
    @@ -375,11 +376,13 @@ public void declareOutputFields(OutputFieldsDeclarer 
declarer) {
                when(env.getMetricGroup()).thenReturn(new 
UnregisteredTaskMetricsGroup());
                when(env.getTaskManagerInfo()).thenReturn(new 
TestingTaskManagerRuntimeInfo());
     
    +           final CloseableRegistry closeableRegistry = new 
CloseableRegistry();
                StreamTask<?, ?> mockTask = mock(StreamTask.class);
                when(mockTask.getCheckpointLock()).thenReturn(new Object());
                when(mockTask.getConfiguration()).thenReturn(new 
StreamConfig(new Configuration()));
                when(mockTask.getEnvironment()).thenReturn(env);
                when(mockTask.getExecutionConfig()).thenReturn(execConfig);
    +           when(mockTask.getCancelables()).thenReturn(closeableRegistry);
    --- End diff --
    
    Mockito as always!
    
    Why not replace this ugly block with `NoOpStreamTask` or something else 
implementing `StreamTask`? It will save the hassle for next developer that will 
try to call some other method from this mock, that wasn't defined properly.


> 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
>             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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