Changing the log level for a running Actor system ? - scala

Question

My resources/application.conf looks like the following.
akka {
loggers = ["akka.event.slf4j.Slf4jLogger"]
loglevel = "DEBUG"
}
I'm creating an fat jar using $sbt assembly that contains this application.conf and deploying this jar to run my actors. Now can I change the log level (from DEBUG to INFO) of my program at runtime without brining down my actor system? If yes, how ?
My logback.xml looks like the following:
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
<target>System.out</target>
<encoder>
<pattern>%X{akkaTimestamp} %-5level[%thread] %logger{0} - %msg%n</pattern>
</encoder>
</appender>
<appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>logs/myjobs.log</file>
<rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy">
<fileNamePattern>logs/myjobs.%i.log.zip</fileNamePattern>
<minIndex>1</minIndex>
<maxIndex>5</maxIndex>
</rollingPolicy>
<triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
<maxFileSize>100MB</maxFileSize>
</triggeringPolicy>
<encoder>
<pattern>%date{yyyy-MM-dd} %X{akkaTimestamp} %-5level[%thread] %logger{1} - %msg%n</pattern>
</encoder>
</appender>
<logger name="akka" level="INFO" />
<root level="DEBUG">
<appender-ref ref="CONSOLE"/>
<appender-ref ref="FILE"/>
</root>
</configuration>

Answer 1

You can set the Akka loglevel using system.eventStream.setLogLevel() (within an Actor you would use context.system as the starting point).