GitHub user markap14 opened a pull request:

    https://github.com/apache/nifi/pull/2153

    NIFI-4379: Event-Driven threads are constantly active, polling a queu…

    …e to see if there is any work to do. Instead of getting number of active 
threads from the ScheduledExecutor for these threads, updated code to use an 
AtomicInteger that is incremented when there's work to do and decremented once 
complete
    
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You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/markap14/nifi NIFI-4379

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

    https://github.com/apache/nifi/pull/2153.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 #2153
    
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commit 4b6078fdb5436ce8a96408021236a1c5e12ead20
Author: Mark Payne <[email protected]>
Date:   2017-09-13T15:01:07Z

    NIFI-4379: Event-Driven threads are constantly active, polling a queue to 
see if there is any work to do. Instead of getting number of active threads 
from the ScheduledExecutor for these threads, updated code to use an 
AtomicInteger that is incremented when there's work to do and decremented once 
complete

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