mirror of https://github.com/apache/druid.git
39 lines
1.4 KiB
Markdown
39 lines
1.4 KiB
Markdown
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---
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layout: doc_page
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---
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Logging
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==========================
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Druid nodes will emit logs that are useful for debugging to the console. Druid nodes also emit periodic metrics about their state. For more about metrics, see [Configuration](Configuration.html). Metric logs are printed to the console by default, and can be disabled with `-Ddruid.emitter.logging.logLevel=debug`.
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Druid uses [log4j](http://logging.apache.org/log4j/2.x/) for logging, and console logs can be configured by adding a log4j.xml file. Add this xml file to your classpath if you want to override default Druid log configuration.
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An example log4j.xml file is shown below:
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```
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<?xml version="1.0" encoding="UTF-8" ?>
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<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
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<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
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<appender name="ConsoleAppender" class="org.apache.log4j.ConsoleAppender">
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<layout class="org.apache.log4j.PatternLayout">
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<param name="ConversionPattern" value="%d{ISO8601} %-5p [%t] %c - %m%n"/>
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</layout>
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</appender>
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<!-- ServerView-related stuff is way too chatty -->
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<logger name="io.druid.client.BatchServerInventoryView">
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<level value="warn"/>
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</logger>
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<logger name="io.druid.curator.inventory.CuratorInventoryManager">
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<level value="warn"/>
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</logger>
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<root>
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<priority value="info" />
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<appender-ref ref="ConsoleAppender"/>
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</root>
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</log4j:configuration>
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```
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