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https://issues.apache.org/jira/browse/NIFI-9863?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17519127#comment-17519127
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Otto Fowler commented on NIFI-9863:
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A new reader may indeed be a better idea.
For the reader:
I'm not sure how you would do the selection in the UI, I would think a custom
page/tab/view that lets you select the items.
The items should have a display name ( editable in the configuration ) and an
actual id that doesn't change etc etc.
> Controller Service for managing custom Grok patterns
> ----------------------------------------------------
>
> Key: NIFI-9863
> URL: https://issues.apache.org/jira/browse/NIFI-9863
> Project: Apache NiFi
> Issue Type: New Feature
> Reporter: Otto Fowler
> Priority: Major
>
> Managing custom Grok expressions in properties for the Grok processors or
> Record readers is cumbersome and not ideal.
> Having a service that managed these expressions in a centralized and reusable
> way would be a benefit to those using Grok patterns.
> This service would allow the configuration of some number custom Grok
> patterns as the service configuration. The MVP would be manual entry, but
> loading patterns from File ( upload to configuration? ) or from some external
> location could be allowed as well down the line.
> In use, it could be argued that the patterns should be loaded from something
> like the schema registry.
> consumers of the service should then be able select the specific service
> instance and then using dependent properties select which patterns provided
> by the service to consume.
> To this end, it may be nice to have the service support pattern 'groups',
> such that you can select all patterns for a group at once. This would be the
> easy button version of the linked multiple expressions to grok reader issue.
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