However, this poses a potential problem in that you won’t know if any queries are slow, as slow queries are still logged at the INFO level.
On the other hand, if you’re only concerned about warnings and error messages related to requests, then you can set the log verbosity to WARN. If you mine these logs for additional insights into your application, then logging every query request may be useful. Logging Slow Queriesįor high-volume search applications, logging every query can generate a large amount of logs and, depending on the volume, potentially impact performance. If you choose to use another log framework that does not support rotation on startup, you may enable SOLR_LOG_PRESTART_ROTATION in bin/solr.in.sh or bin/solr.in.cmd to let the start script rotate the logs on startup. On every startup or restart of Solr, log4j2 performs log rotation. Java Garbage Collection logs are rotated by the JVM when size hits 20M, for a max of 9 generations. When starting Solr in the background, it will write all stdout and stderr output to a log file in solr-console.log, and automatically disable the CONSOLE logger configured in log4j2.xml, having the same effect as if you removed the CONSOLE appender from the rootLogger manually.Īlso, in log4j2.xml if the default log rotation size threshold of 32MB is too small for production servers then you should increase it to a larger value (such as 100MB or more). When starting Solr in the foreground ( -f option), all logs will be sent to the console, in addition to solr.log. Note that if you installed Solr as a service using the instructions provided in Taking Solr to Production, then see /var/solr/log4j2.xml instead of the default server/resources version. When you’re ready to deploy Solr in production, set the variable SOLR_LOGS_DIR to the location where you want Solr to write log files, such as /var/solr/logs. By default, Solr log messages will be written to SOLR_LOGS_DIR/solr.log. Take a moment to inspect the contents of the log4j2.xml file so that you are familiar with its structure. Solr uses Log4J version 2.13.2 for logging which is configured using server/resources/log4j2.xml. To set a log level for a particular directory, select it and click the appropriate log level button.īin/solr start -f -q Permanent Logging Settings The Log Level Menuĭirectories are shown with their current logging levels. When you select Level, you see the following menu: Figure 2. This makes it possible to change many categories at once by adjusting the logging level of their parent. Fortunately, any categories that are unset will have the logging level of its parent. This part of the Admin Web interface allows you to set the logging level for many different log categories. (For more information about the Admin Web interface, see Using the Solr Administration User Interface.) Figure 1. Note that this page only lets you change settings in the running system and is not saved for the next run. You can control the amount of logging output in Solr by using the Admin Web interface. See the section on Common Query Parameters for more information. Don’t editorialize titles or submit clickbait.In addition to the logging options described below, there is a way to configure which request parameters (such as parameters sent as part of queries) are logged with an additional request parameter called logParamsList.No reposts, spam, self-promotion or rehosted content.
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