GitHub user markap14 opened a pull request:

    https://github.com/apache/nifi/pull/3062

    NIFI-5686: Updated StandardProcessScheduler so that if it fails to sc…

    …hedule a Reporting Task, it re-schedules the @OnScheduled task instead 
of looping and calling Thread.sleep. As it was, the single-threaded Process 
Scheduler was, when calling ProcessScheduler.unschedule(), the unschedule task 
was not executing because the schedule task was using the only thread. But 
switching the logic to schedule the task for later and return, instead of 
calling Thread.sleep and looping, we are able to avoid blocking the one thread 
in the thread pool. Also, performed some trivial code cleanup and updated 
erroneous links in Java-docs.
    
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You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/markap14/nifi NIFI-5686

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/nifi/pull/3062.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #3062
    
----
commit c14092db13cdc2a26da451b61c6d6c8d4903fd1a
Author: Mark Payne <markap14@...>
Date:   2018-10-11T15:45:41Z

    NIFI-5686: Updated StandardProcessScheduler so that if it fails to schedule 
a Reporting Task, it re-schedules the @OnScheduled task instead of looping and 
calling Thread.sleep. As it was, the single-threaded Process Scheduler was, 
when calling ProcessScheduler.unschedule(), the unschedule task was not 
executing because the schedule task was using the only thread. But switching 
the logic to schedule the task for later and return, instead of calling 
Thread.sleep and looping, we are able to avoid blocking the one thread in the 
thread pool. Also, performed some trivial code cleanup and updated erroneous 
links in Java-docs.

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