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https://issues.apache.org/jira/browse/CALCITE-641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14377156#comment-14377156
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Nick Dimiduk commented on CALCITE-641:
--------------------------------------

I think Hadoop projects tend to use Apache Commons Logging. I believe SLF4J may 
be the more current best-practice however, In particular, it has 
[MDC|http://www.slf4j.org/manual.html#mdc] support, which would be a good thing.

> Implement logging throughout Avatica
> ------------------------------------
>
>                 Key: CALCITE-641
>                 URL: https://issues.apache.org/jira/browse/CALCITE-641
>             Project: Calcite
>          Issue Type: Improvement
>            Reporter: Nick Dimiduk
>            Assignee: Julian Hyde
>              Labels: avatica
>             Fix For: next
>
>
> Right now there's not much to go on regarding the Avatica internals. We 
> should make a decision on a logging library and take a first pass at 
> operational log messages. We should also provide a recommended log 
> configuration for downstreamers.



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