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https://issues.apache.org/jira/browse/FLINK-4715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15584856#comment-15584856
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ASF GitHub Bot commented on FLINK-4715:
---------------------------------------

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

    https://github.com/apache/flink/pull/2652#discussion_r83800506
  
    --- Diff: 
flink-runtime/src/main/java/org/apache/flink/runtime/taskmanager/Task.java ---
    @@ -1251,33 +1289,113 @@ public void run() {
                                catch (InterruptedException e) {
                                        // we can ignore this
                                }
    +                   }
    +                   catch (Throwable t) {
    +                           LOG.error("Error in the task canceler", t);
    +                   }
     
    -                           // it is possible that the user code does not 
react immediately. for that
    -                           // reason, we spawn a separate thread that 
repeatedly interrupts the user code until
    -                           // it exits
    -                           while (executer.isAlive()) {
    -                                   // build the stack trace of where the 
thread is stuck, for the log
    -                                   StringBuilder bld = new StringBuilder();
    -                                   StackTraceElement[] stack = 
executer.getStackTrace();
    -                                   for (StackTraceElement e : stack) {
    -                                           bld.append(e).append('\n');
    -                                   }
    +                   System.out.println("Canceler done");
    --- End diff --
    
    Leftover?


> TaskManager should commit suicide after cancellation failure
> ------------------------------------------------------------
>
>                 Key: FLINK-4715
>                 URL: https://issues.apache.org/jira/browse/FLINK-4715
>             Project: Flink
>          Issue Type: Improvement
>          Components: TaskManager
>    Affects Versions: 1.2.0
>            Reporter: Till Rohrmann
>            Assignee: Ufuk Celebi
>             Fix For: 1.2.0
>
>
> In case of a failed cancellation, e.g. the task cannot be cancelled after a 
> given time, the {{TaskManager}} should kill itself. That way we guarantee 
> that there is no resource leak. 
> This behaviour acts as a safety-net against faulty user code.



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