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Posted to issues@nifi.apache.org by "Joseph Witt (JIRA)" <ji...@apache.org> on 2019/03/12 16:28:00 UTC

[jira] [Updated] (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 ]

Joseph Witt updated NIFI-6065:
------------------------------
    Fix Version/s: 1.9.1

> 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
>             Fix For: 1.10.0, 1.9.1
>
>
> 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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