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https://issues.apache.org/jira/browse/FLINK-2488?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15043996#comment-15043996
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ASF GitHub Bot commented on FLINK-2488:
---------------------------------------

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

    https://github.com/apache/flink/pull/1386#discussion_r46773689
  
    --- Diff: 
flink-runtime/src/main/java/org/apache/flink/runtime/taskmanager/Task.java ---
    @@ -240,14 +234,13 @@ public Task(TaskDeploymentDescriptor tdd,
                checkArgument(tdd.getNumberOfSubtasks() > 0);
                checkArgument(tdd.getIndexInSubtaskGroup() >= 0);
                checkArgument(tdd.getIndexInSubtaskGroup() < 
tdd.getNumberOfSubtasks());
    +           checkArgument(tdd.getAttemptNumber() >= 0);
    --- End diff --
    
    You can probably skip these checks, given that `TaskInfo` has these checks 
already...


> Expose attemptNumber in RuntimeContext
> --------------------------------------
>
>                 Key: FLINK-2488
>                 URL: https://issues.apache.org/jira/browse/FLINK-2488
>             Project: Flink
>          Issue Type: Improvement
>          Components: JobManager, TaskManager
>    Affects Versions: 0.10.0
>            Reporter: Robert Metzger
>            Assignee: Sachin Goel
>            Priority: Minor
>
> It would be nice to expose the attemptNumber of a task in the 
> {{RuntimeContext}}. 
> This would allow user code to behave differently in restart scenarios.



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