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https://issues.apache.org/jira/browse/NIFI-4773?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16327332#comment-16327332
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Matt Burgess commented on NIFI-4773:
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One thing I noticed with QDT (while investigating this issue) is that the
processor is annotated as EventDriven and not TriggerSerially, even though
input is forbidden and the processor was designed to run on a single thread on
the Primary Node only. To avoid any possible multithreading issues (with
multiple concurrent tasks trying to populate the table information), I think we
should change from EventDriven to TriggerSerially.
> QueryDatabaseTable setup is incorrect
> -------------------------------------
>
> Key: NIFI-4773
> URL: https://issues.apache.org/jira/browse/NIFI-4773
> Project: Apache NiFi
> Issue Type: Bug
> Components: Extensions
> Affects Versions: 1.2.0
> Reporter: Wynner
> Assignee: Matt Burgess
> Priority: Major
>
> The QueryDatabaseTable processor attempts to make a database connection
> during setup (OnScheduled), this can cause issues with the flow when errors
> occur.
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