Solr is an Apache project that uses slf4j, with log4j 1.2 as the final
logging destination.
In one of the classes in Solr, specifically the SolrCore class, these
are the loggers defined:
private static final Logger log =
LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
public static final Logger requestLog =
LoggerFactory.getLogger(MethodHandles.lookup().lookupClass().getName() +
".Request");
I would like to define an additional logger like this:
private static final Logger slowLog =
LoggerFactory.getLogger(MethodHandles.lookup().lookupClass().getName() +
".SlowRequest");
Between the lines below is the log4j.properties file that Solr includes
out of the box:
==============
# Default Solr log4j config
# rootLogger log level may be programmatically overridden by
-Dsolr.log.level
solr.log=${solr.log.dir}
log4j.rootLogger=INFO, file, CONSOLE
# Console appender will be programmatically disabled when Solr is
started with option -Dsolr.log.muteconsole
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.layout=org.apache.log4j.EnhancedPatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=%d{yyyy-MM-dd
HH:mm:ss.SSS} %-5p (%t) [%X{collection} %X{shard} %X{replica} %X{core}]
%c{1.} %m%n
#- size rotation with log cleanup.
log4j.appender.file=org.apache.log4j.RollingFileAppender
log4j.appender.file.MaxFileSize=4MB
log4j.appender.file.MaxBackupIndex=9
#- File to log to and log format
log4j.appender.file.File=${solr.log}/solr.log
log4j.appender.file.layout=org.apache.log4j.EnhancedPatternLayout
log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss.SSS}
%-5p (%t) [%X{collection} %X{shard} %X{replica} %X{core}] %c{1.} %m%n
# Adjust logging levels that should differ from root logger
log4j.logger.org.apache.zookeeper=WARN
log4j.logger.org.apache.hadoop=WARN
log4j.logger.org.eclipse.jetty=WARN
log4j.logger.org.eclipse.jetty.server.Server=INFO
log4j.logger.org.eclipse.jetty.server.ServerConnector=INFO
# set to INFO to enable infostream log messages
log4j.logger.org.apache.solr.update.LoggingInfoStream=OFF
==============
I would like to add some commented out lines to the stock properties
file which will allow a user to uncomment the lines to enable a separate
"slow query" logfile. The full logger name would be
org.apache.solr.core.SolrCore.SlowRequest for these logs. In addition to
directing logs for this logger (which will be at the WARN level) to the
separate file, the commented config should *remove* those lines from the
main solr.log file, if that is possible.
I have not been able to determine what configuration would produce these
results. Can this list help? One thing I have considered is converting
to the XML config format, but I have not been able to locate any
resources for making that conversion.
Thanks,
Shawn
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