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From "Varun Thacker (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-11453) Create separate logger for slow requests
Date Wed, 09 May 2018 04:42:00 GMT

    [ https://issues.apache.org/jira/browse/SOLR-11453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16468319#comment-16468319
] 

Varun Thacker commented on SOLR-11453:
--------------------------------------

{quote}I have plans to try and create a log4j config that uses a sysprop to decide whether
to log slow requests to a separate file, but it's not something that I expect to come together
quickly.
{quote}
Checkout StartupLoggingUtils#muteConsole on how we disable console logs when not running in
foreground mode.  We could use a similar trick.

 

Do we really want to add a sysprop? My thoughts are to enable it by default and then if a
user doesn't want it he can change the log4j2.xml himself.  

> 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, SOLR-11453.patch,
slowlog-informational.patch, slowlog-informational.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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