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https://issues.apache.org/jira/browse/NIFI-1452?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16023393#comment-16023393
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ASF GitHub Bot commented on NIFI-1452:
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Github user asfgit closed the pull request at:
https://github.com/apache/nifi/pull/1832
> Yield Duration can short circuit long Timer Driven Run Schedule
> ---------------------------------------------------------------
>
> Key: NIFI-1452
> URL: https://issues.apache.org/jira/browse/NIFI-1452
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Affects Versions: 0.4.1
> Reporter: Michael Moser
> Assignee: Michael Moser
> Priority: Trivial
>
> This may be a rare use case, but I configured a GetFile processor to be Timer
> Driven with a Run Schedule of 30 secs. Its Yield Duration was default 1 sec.
> I expected GetFile onTrigger() to be called every 30 secs, but it was being
> called every 1 sec most of the time.
> GetFile will call context.yield() when it polls a directory and gets an empty
> list in return. It appears that a yield will ignore the Run Schedule. Many
> standard processors call context.yield() when they have no work to do.
> I changed my scheduling strategy to CRON Driven with its run schedule every
> 30 seconds, and the onTrigger() was called every 30 seconds, even after a
> yield. So CRON Driven scheduling is working as expected after a yield.
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