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https://issues.apache.org/jira/browse/NIFI-3635?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15952232#comment-15952232
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Andre F de Miranda commented on NIFI-3635:
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[~markap14] - thanks for catching this. I totally missed it :-(
> ExtractGrok processor gets confused if more than one instance of Processor is
> on graph
> --------------------------------------------------------------------------------------
>
> Key: NIFI-3635
> URL: https://issues.apache.org/jira/browse/NIFI-3635
> Project: Apache NiFi
> Issue Type: Bug
> Components: Extensions
> Reporter: Mark Payne
> Assignee: Joseph Witt
> Priority: Critical
> Fix For: 1.2.0
>
>
> ExtractGrok uses a 'private static final' member variable for the Grok
> object. This means that all instances of the Processor have the same 'Grok'
> object. So if two or more Processors are added to the graph, the Grok
> Expression configured for the last-started Processor is the Expression that
> will be used.
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