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https://issues.apache.org/jira/browse/SOLR-11453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16464852#comment-16464852
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Ralph Goers commented on SOLR-11453:
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Yes, as the implementation of those shows, it is entirely possible to
dynamically create appenders. If those don't exactly meet your needs you could
look at what they do and create something similar that does. You could either
include that with Solr or provide a patch to Log4j to include it. For example,
if you don't want to rely on a Script you could modify ScriptAppenderSelector
to be SystemPropertyAppenderSelector where the build method would rely on the
system property to choose which Appender to create.
> Create separate logger for slow requests
> ----------------------------------------
>
> Key: SOLR-11453
> URL: https://issues.apache.org/jira/browse/SOLR-11453
> Project: Solr
> Issue Type: Improvement
> Components: logging
> Affects Versions: 7.0.1
> Reporter: Shawn Heisey
> Assignee: Shawn Heisey
> Priority: Minor
> Attachments: SOLR-11453.patch, SOLR-11453.patch, SOLR-11453.patch
>
>
> There is some desire on the mailing list to create a separate logfile for
> slow queries. Currently it is not possible to do this cleanly, because the
> WARN level used by slow query logging within the SolrCore class is also used
> for other events that SolrCore can log. Those messages would be out of place
> in a slow query log. They should typically stay in main solr logfile.
> I propose creating a custom logger for slow queries, similar to what has been
> set up for request logging. In the SolrCore class, which is
> org.apache.solr.core.SolrCore, there is a special logger at
> org.apache.solr.core.SolrCore.Request. This is not a real class, just a
> logger which makes it possible to handle those log messages differently than
> the rest of Solr's logging. I propose setting up another custom logger
> within SolrCore which could be org.apache.solr.core.SolrCore.SlowRequest.
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