spf4j-logback

A collection of logback components to implement:

• Log directly to avro data files. Significantly more compacter (5x), structured. See schema at

• Json encoder to use with stock logback appenders.

• Available /logs JAX-RS actuator endpoint, that allows you fast access to your logs, across your entire cluster. (in spf4j-jaxrs-actuator)

latest version:

To use it all you need to do it to add :

    <dependency>
      <groupId>org.spf4j</groupId>
      <artifactId>spf4j-logback</artifactId>
      <version>LATEST</version>
    </dependency>

and configure your logback.xml accordingly.

The library contains a default logback.xml that will log to the console in text format. The console output is usually used during the initialization and destruction phase of the process, before and after LogbackService. LogbackService defaults to logback-avro.xml which will log all logs to a avro binary file.

Here is a example logback configuration to enable all logs to a avro log file, and errors to the console in json format as well.

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
   <shutdownHook/>

  	<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
          <encoder class="org.spf4j.log.ReadableLogbackEncoder"/>
              <!-- you want JSON, use this:
		<encoder class="org.spf4j.log.AvroLogbackEncoder"/>
              -->
          <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>ERROR</level>
          </filter>
	</appender>

	<appender name="default" class="org.spf4j.log.AvroDataFileAppender">
          <fileNameBase>${logFileBase}</fileNameBase>
          <destinationPath>/var/log</destinationPath>
	</appender>

        <appender name="ASYNC_FILE" class="ch.qos.logback.classic.AsyncAppender">
          <appender-ref ref="default"/>
          <queueSize>500</queueSize>
          <maxFlushTime>1000</maxFlushTime>
       </appender>

	<logger name="org.spf4j" level="info" additivity="false">
		<appender-ref ref="ASYNC_FILE" />
	</logger>

	<root level="warn">
          <appender-ref ref="ASYNC_FILE" />
          <appender-ref ref="CONSOLE" />
	</root>

</configuration>