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From "Ralph Goers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-11453) Create separate logger for slow requests
Date Sat, 05 May 2018 18:06:00 GMT

    [ https://issues.apache.org/jira/browse/SOLR-11453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16464852#comment-16464852
] 

Ralph Goers commented on SOLR-11453:
------------------------------------

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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