[jira] [Assigned] (NIFI-4064) Funnel with no outgoing connections and a queued Flow File uses high CPU

["Wesley L Lawrence (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/NIFI-4064?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wesley L Lawrence reassigned NIFI-4064:
---------------------------------------

    Assignee: Wesley L Lawrence

> Funnel with no outgoing connections and a queued Flow File uses high CPU
> ------------------------------------------------------------------------
>
>                 Key: NIFI-4064
>                 URL: https://issues.apache.org/jira/browse/NIFI-4064
>             Project: Apache NiFi
>          Issue Type: Bug
>    Affects Versions: 1.3.0
>            Reporter: Wesley L Lawrence
>            Assignee: Wesley L Lawrence
>            Priority: Minor
>         Attachments: FlowWithOneFileInQueue.png, nifi-4064.patch, NifiPostEmptyLowCpu.png, NifiPreEmptyHighCpu.png, WithFixPrePostCpu.png
>
>
> I have a simple Flow where a file containing JSON data is read, and converted to Avro.
> !FlowWithOneFileInQueue.png!
> However, I have the resulting Avro container file parked in a queue going to a Funnel, and it causes my CPU to spike.
> !NifiPreEmptyHighCpu.png!
> Emptying the queue causes the CPU to return to normal.
> !NifiPostEmptyLowCpu.png!
> It seems that in the 'ContinuallyRunConnectableTask' class, it does correctly determine that the Funnel shouldn't be run, but since there is both a FlowFile in queue, and a relaiton, it also decides to not yield.
> I've added both a fix for this (patch to follow), as well as a new unit test to make sure Funnels without outgoing connections get yielded. With the fix, the CPU spiking is gone.
> !WithFixPrePostCpu.png!



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