Brandon DeVries created NIFI-6157:
-------------------------------------
Summary: StandardFunnel transferring too slowly
Key: NIFI-6157
URL: https://issues.apache.org/jira/browse/NIFI-6157
Project: Apache NiFi
Issue Type: Improvement
Reporter: Brandon DeVries
https://issues.apache.org/jira/browse/NIFI-6068?filter=-2 made modifications
such that a funnel wouldn't hold on to a TimerDriven thread excessively.
However, now it isn't holding on to the thread long enough...
Since Funnels and Local Ports are scheduled with the timer driven thread pool,
they're competing for threads with all of the other processors on the graph.
In a large flow with a large number of processors, potentially with multiple
assigned concurrent tasks, funnels and ports get to run less and less
frequently, since they are hard coded to 1 concurrent task.
I'm open to implementation options, but a couple of possibilities are:
* Increase the transferred FlowFilecap from 10K to 100K. The thread will
still be released if less than the requested 1000 FlowFiles are moved in a
loop, so it won't hold on inappropriately, but it will still have the
opportunity to move the files that need to be moved. Furthermore, if the back
pressure on the outgoing relationship is engaged, it will cause the thread to
be released. Effectively, the amount transferred would be limited by the max
of 100K and outgoing queue capacity.
* Like above, but add a property to specify the max number of FlowFiles
transferred per run. Removing hard coded magic numbers is good... but
cluttering nifi.properties is bad, so its a trade off.
* Increase the number of concurrent threads for funnels / ports. This
probably would want to be a configurable property, as the value should really
likely be proportional to the "size" of your flow, whatever that means for the
system in question.
* Increase the "run duration"... but i don't think i like that.
* If session.getQueueSize exceeds some threshold, spin off a new thread to
transfer those files... but that could be dangerous.
* Create a new thread pool for ports / funnels, so they aren't starved by
processors. Similar to above, but reuses resources. Still would need to
determine the correct size of the pool. This could be the best answer in
theory, but would also require the most code work.
[~markap14], thoughts?
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
