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https://issues.apache.org/jira/browse/SOLR-8274?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17136677#comment-17136677
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Jason Gerlowski commented on SOLR-8274:
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I looked a bit at the OpenTracing docs in the ref-guide, but I'll admit I don't
fully understand OpenTracing. The sense I got from reading them was that
OpenTracing:
# Required some metric backend to receive tracing info (Datadog, etc.)
# Was geared towards understanding aggregate performance data, rather than
having it reliably be present on any given request. (the docs mention only
sampling a small percentage of requests by default to avoid affecting
performance.)
I'm not sure those takeaways are correct - I'd appreciate being corrected if
they're not. But if I've got that right, then it seems like using MDC as this
ticket suggests or using the different approach in SOLR-14566 could be valuable
supplements to what OpenTracing provides. OpenTracing and logging-improvements
would both be valuable in tandem, and don't duplicate functionality.
But like I said, I might be wrong there.
> Add per-request MDC logging based on user-provided value.
> ---------------------------------------------------------
>
> Key: SOLR-8274
> URL: https://issues.apache.org/jira/browse/SOLR-8274
> Project: Solr
> Issue Type: Improvement
> Components: logging
> Reporter: Jason Gerlowski
> Priority: Minor
> Attachments: SOLR-8274.patch
>
>
> *Problem 1* Currently, there's no way (AFAIK) to find all log messages
> associated with a particular request.
> *Problem 2* There's also no easy way for multi-tenant Solr setups to find all
> log messages associated with a particular customer/tenant.
> Both of these problems would be more manageable if Solr could be configured
> to record an MDC tag based on a header, or some other user provided value.
> This would allow admins to group together logs about a single request. If
> the same header value is repeated multiple times this functionality could
> also be used to group together arbitrary requests, such as those that come
> from a particular user, etc.
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