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Posted to issues@nifi.apache.org by "Mark Payne (JIRA)" <ji...@apache.org> on 2019/02/22 14:39:00 UTC
[jira] [Assigned] (NIFI-6065) Root Group Ports "waiting" too long
[ https://issues.apache.org/jira/browse/NIFI-6065?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Mark Payne reassigned NIFI-6065:
--------------------------------
Assignee: Mark Payne
> 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
> Assignee: Mark Payne
> Priority: Major
>
> 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. EDIT: which probably makes it a candidate for a nifi.property
> Any other thoughts or suggestions would be appreciated.
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