Log4j2: BurstFilter: regulates logging traffic

can control the rate at which log events are processed, once maximum limit has been reached, subsequent log events are discarded silently.

Following are the Burst Filter Parameters.

Parameter	Type	Description
level	String	Level of messages to be filtered. Anything at or below this level will be filtered out if maxBurst has been exceeded. The default is WARN meaning any messages that are higher than warn will be logged regardless of the size of a burst.
rate	float	The average number of events per second to allow.
maxBurst	integer	The maximum number of events that can occur before events are filtered for exceeding the average rate. The default is 10 times the rate.
onMatch	String	Action to take when the filter matches. May be ACCEPT, DENY or NEUTRAL. The default value is NEUTRAL.
onMismatch	String	Action to take when the filter does not match. May be ACCEPT, DENY or NEUTRAL. The default value is DENY.

log4j2.xml

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="warn" name="MyApp" packages="">
 <Appenders>
  <Console name="my_console_appender" target="SYSTEM_OUT">
   <BurstFilter level="INFO" rate="16" maxBurst="100" />
   <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />
  </Console>
 </Appenders>

 <Loggers>
  <Root level="trace">
   <AppenderRef ref="my_console_appender" />
  </Root>
 </Loggers>
</Configuration>

package log4j_tutorial;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

public class HelloWorld {
 private static final Logger logger = LogManager.getLogger();

 public static void main(String args[]) throws InterruptedException {
  logger.trace("Trace Message!");
  logger.debug("Debug Message!");
  logger.info("Info Message!");
  logger.warn("Warn Message!");
  logger.error("Error Message!");
  logger.fatal("Fatal Message!");
 }

}

Run HelloWorld application, you will get following output.

15:01:37.985 [main] TRACE log4j_tutorial.HelloWorld - Trace Message!
15:01:37.986 [main] DEBUG log4j_tutorial.HelloWorld - Debug Message!
15:01:37.986 [main] INFO  log4j_tutorial.HelloWorld - Info Message!
15:01:37.986 [main] WARN  log4j_tutorial.HelloWorld - Warn Message!
15:01:37.986 [main] ERROR log4j_tutorial.HelloWorld - Error Message!
15:01:37.986 [main] FATAL log4j_tutorial.HelloWorld - Fatal Message!

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