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https://issues.apache.org/jira/browse/NIFI-4629?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16261329#comment-16261329
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Fredrik Sko commented on NIFI-4629:
-----------------------------------
bq. Additionally, the incoming flowfiles now ends up in some "dead" state where
I'm unable to even empty the queue.
To clarify, this is the reason I submitted the issue with a critical severity.
This makes my data inaccessible and I have yet to find a workaround to recover
it.
> Non-existing attribute in ControlRate configuration causes
> NullPointerException
> -------------------------------------------------------------------------------
>
> Key: NIFI-4629
> URL: https://issues.apache.org/jira/browse/NIFI-4629
> Project: Apache NiFi
> Issue Type: Bug
> Components: Configuration
> Affects Versions: 1.4.0
> Environment: Ubuntu LTS 16.04
> openjdk-8-jre
> Reporter: Fredrik Sko
> Priority: Critical
> Labels: ControlRate, NullPointerException, Processor
> Attachments: ControlRate-NP.xml
>
>
> When using the ControlRate processor, defining the "Grouping Attribute" with
> a missing/non-existing attribute name produces NullPointerException errors.
> Processor configuration:
> {quote}
> Rate Control Criteria: flowfile count
> Maximum rate: 10
> Rate Controlled Attributes: (No value set)
> Time Duration: 1 min
> Grouping Attribute: foobar
> {quote}
> ControlRate with the following configuration when sent a flowfile without the
> attribute {{foobar}} generates the following error:
> bq. ControlRate\[id=dff05b32-015f-1000-db55-5957a9298bab]
> ControlRate\[id=dff05b32-015f-1000-db55-5957a9298bab] failed to process due
> to java.lang.NullPointerException; rolling back session: null
> Additionally, the incoming flowfiles now ends up in some "dead" state where
> I'm unable to even empty the queue.
> A simple template for reproduction is attached.
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