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https://issues.apache.org/jira/browse/SOLR-11453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16464452#comment-16464452
]
Remko Popma commented on SOLR-11453:
------------------------------------
It may be easier to discuss here rather than on the log4j mailing list, so here
is one idea.
Configure log4j so that a certain named logger is associated with a separate
appender. In your application code, all logging that needs to end up in the
"slow requests" log file should be done using the logger with that name.
{noformat}
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">
<Properties>
<Property name="filename">logs/app.log</Property>
<Property name="slowLogs">logs/app-slow.log</Property>
</Properties>
<Appenders>
<File name="file" fileName="${filename}">
<PatternLayout pattern="%d{HH:mm:ss.SSS} %-5level [%t] %logger{36} -
%msg%n"/>
</File>
<File name="slow" fileName="${slowLogs}">
<PatternLayout pattern="%d %p [%t] %c{1.} %m%n"/>
</File>
</Appenders>
<Loggers>
<Logger name="org.apache.solr.core.SolrCore.SlowRequest" level="trace">
<AppenderRef ref="slow"/>
</Logger>
<Root level="info">
<AppenderRef ref="file"/>
</Root>
</Loggers>
</Configuration>
{noformat}
In your application:
{code}
private final static Logger slowRequests =
LogManager.getLogger("org.apache.solr.core.SolrCore.SlowRequest");
private final static Logger logger = LogManager.getLogger();
...
logger.trace("normal logging");
slowRequests.trace("a slow request just came in");
{code}
With the above configuration, all log messages sent to the {{slowRequests}}
logger end up in both the log files. If you want to send the slow request log
messages to the slow log file only, set {{additivity = "false"}} on the slow
logger. See the
[manual|https://logging.apache.org/log4j/2.x/manual/configuration.html#Additivity]
for details.
> 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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