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https://issues.apache.org/jira/browse/SOLR-5969?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Smiley resolved SOLR-5969.
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Resolution: Duplicate
> Enable distributed tracing of requests
> --------------------------------------
>
> Key: SOLR-5969
> URL: https://issues.apache.org/jira/browse/SOLR-5969
> Project: Solr
> Issue Type: Improvement
> Reporter: Gregg Donovan
> Priority: Major
> Attachments: SOLR-5969.diff, SOLR-5969.diff
>
>
> Enable users to add diagnostic information to requests and trace them in the
> logs across servers.
> We have some metadata -- e.g. a request UUID -- that we log to every log line
> using [Log4J's
> MDC|http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/MDC.html].
> The UUID logging allows us to connect any log lines we have for a given
> request across servers. Sort of like Twitter's
> [Zipkin|http://twitter.github.io/zipkin/].
> Currently we're using EmbeddedSolrServer without sharding, so adding the UUID
> is fairly simple, since everything is in one process and one thread. But,
> we're testing a sharded HTTP implementation and running into some
> difficulties getting this data passed around in a way that lets us trace all
> log lines generated by a request to its UUID.
> The first thing I tried was to add the UUID by adding it to the SolrParams.
> This achieves the goal of getting those values logged on the shards if a
> request is successful, but we miss having those values in the MDC if there
> are other log lines before the final log line. E.g. an Exception in a custom
> component.
> My current thought is that sending HTTP headers with diagnostic information
> would be very useful. Those could be placed in the MDC even before handing
> off to work to SolrDispatchFilter, so that any Solr problem will have the
> proper logging.
> I.e. every additional header added to a Solr request gets a "Solr-" prefix.
> On the server, we look for those headers and add them to the [SLF4J
> MDC|http://www.slf4j.org/manual.html#mdc].
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