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https://issues.apache.org/jira/browse/SOLR-8274?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15000820#comment-15000820
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Mark Miller commented on SOLR-8274:
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bq. especially when we need to jump thread/process boundaries
interesting Apahce project along those lines: http://htrace.org/
> 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
> Reporter: Jason Gerlowski
> Priority: Minor
>
> *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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