Brandon DeVries created NIFI-6065:
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Summary: Root Group Ports "waiting" too long
Key: NIFI-6065
URL: https://issues.apache.org/jira/browse/NIFI-6065
Project: Apache NiFi
Issue Type: Improvement
Components: Core Framework
Affects Versions: 1.9.0
Reporter: Brandon DeVries
In NIFI-408, a change was made to StandardRootGroupPort to poll for 100 millis
instead of doing a non-blocking poll, and yielding if there were no results.
While I don't know the initial motivation for this change (thoughts,
[~markap14]?), the current implementation is resulting in an excessive number
of Timer-Driven threads stuck in the TIMED_WAITING state. Essentially, if you
have a high number of low traffic remote ports, you lose a substantial chunk of
your timer driven thread pool to simply "waiting".
My first thought would be to revert the change, possibly even without the
context.yield. Second would be to drastically reduce the poll timeout... 10 or
5 millis, although any choice is somewhat arbitrary and flow-dependent.
Any other thoughts or suggestions would be appreciated.
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