Brandon DeVries created NIFI-6068:
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Summary: StandardFunnel looping excessively
Key: NIFI-6068
URL: https://issues.apache.org/jira/browse/NIFI-6068
Project: Apache NiFi
Issue Type: Bug
Components: Core Framework
Affects Versions: 1.9.0
Reporter: Brandon DeVries
The StandardFunnel, when triggered, reads up to 100 FlowFiles at a time and
writes them to the outgoing relationship. It does this inside of a loop, with
the only exit conditions being:
# No FlowFiles read (input queue empty)
# No Available relationships to transfer to
It does this using a thread from the timer driven thread pool. Unfortunately,
this means that a flow can be created such that a constant trickle of data will
prevent processors from running, as all threads are in use by ports, which will
never let them go.
To fix this, I'd suggest adding 2 checks. First, if session.get(100) returns
fewer than 100 FlowFiles, transfer those files and then return. Essentially,
while more files may subsequently come in, at that point the queue had been
emptied.
Second, put a cap on the number of FlowFiles transferred per call to onTrigger.
While there may still be files to move downstream, after you've transferred
100K or so it might be time to give up the thread.
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