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https://issues.apache.org/jira/browse/FLINK-2488?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15043970#comment-15043970
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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_r46773363
  
    --- Diff: 
flink-core/src/main/java/org/apache/flink/api/common/functions/RuntimeContext.java
 ---
    @@ -65,6 +65,22 @@
        int getIndexOfThisSubtask();
     
        /**
    +    * Gets the attempt number of this parallel subtask. First attempt is 
numbered 0.
    --- End diff --
    
    I would add here something like: "The attempt number corresponds to how 
many times the task has been restarted (after a failure or cancellation) since 
the job was initially started."


> 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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