GitHub user markap14 opened a pull request:

    https://github.com/apache/nifi/pull/2460

    NIFI-4858: Expose Request Timeout from HTTP Context Map and use that …

    …to set as the timeout of the 'AsyncContext' in HandleHttpRequest. 
Otherwise, the request will never timeout (which is OK because the 
HttpContextMap will handle this). However, Jetty behind the scenes is adding a 
task to Scheduled Executor for each request with a delay of whatever the 
timeout is set to. Since it's currently set to Long.MAX_VALUE, that task will 
never be run and as a result the ExecutorService's queue will grow 
indefinitely, eventually exhausting the JVM Heap
    
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You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/markap14/nifi NIFI-4858

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

    https://github.com/apache/nifi/pull/2460.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 #2460
    
----
commit d14f62f84b96fa8a7adddcfa9299469d41b0877e
Author: Mark Payne <markap14@...>
Date:   2018-02-08T20:02:06Z

    NIFI-4858: Expose Request Timeout from HTTP Context Map and use that to set 
as the timeout of the 'AsyncContext' in HandleHttpRequest. Otherwise, the 
request will never timeout (which is OK because the HttpContextMap will handle 
this). However, Jetty behind the scenes is adding a task to Scheduled Executor 
for each request with a delay of whatever the timeout is set to. Since it's 
currently set to Long.MAX_VALUE, that task will never be run and as a result 
the ExecutorService's queue will grow indefinitely, eventually exhausting the 
JVM Heap

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