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https://issues.apache.org/jira/browse/DRILL-3520?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14633884#comment-14633884
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Daniel Barclay (Drill) commented on DRILL-3520:
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This DRILL-3520 might be partly covered by DRILL-3496 logging improvements
(e.g., logging detection of drill-module.conf files and the pattern of logging
the finding of storage plug-ins, functions, etc.).
> Provide better logging around UDF loading and module loading
> ------------------------------------------------------------
>
> Key: DRILL-3520
> URL: https://issues.apache.org/jira/browse/DRILL-3520
> Project: Apache Drill
> Issue Type: Sub-task
> Reporter: Jacques Nadeau
>
> When adding an extension to Drill, sometimes it is hard to know what is going
> on. We should:
> - improve logging so that we report at INFO level information about all the
> Jar files that were included in Drill's consideration set (marked) and those
> that are not. (and include this debug analysis in the documentation)
> - If Drill fails to load a function, register an error function so that
> trying to invoke the UDF will provide the user with information about why the
> function failed to load.
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