[HADOOP-17642] Remove appender EventCounter to avoid instantiation

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.4.0
• Fix Version/s: 3.4.0
• Component/s: common
• Labels: pull-request-available
• Target Version/s: 3.4.0
• Hadoop Flags: Reviewed
• Assignee: Viraj Jasani
• Reporter: Viraj Jasani
• Created: 16/Apr/21 19:17
• Updated: 27/Jan/24 06:03
• Resolved: 17/Apr/21 11:48

Description

After removal of EventCounter class, we are not able to bring up HDFS cluster.

log4j:ERROR Could not instantiate class [org.apache.hadoop.log.metrics.EventCounter].
java.lang.ClassNotFoundException: org.apache.hadoop.log.metrics.EventCounter
	at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:264)
	at org.apache.log4j.helpers.Loader.loadClass(Loader.java:198)
	at org.apache.log4j.helpers.OptionConverter.instantiateByClassName(OptionConverter.java:327)
	at org.apache.log4j.helpers.OptionConverter.instantiateByKey(OptionConverter.java:124)
	at org.apache.log4j.PropertyConfigurator.parseAppender(PropertyConfigurator.java:785)
	at org.apache.log4j.PropertyConfigurator.parseCategory(PropertyConfigurator.java:768)
	at org.apache.log4j.PropertyConfigurator.configureRootCategory(PropertyConfigurator.java:648)
	at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:514)
	at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:580)
	at org.apache.log4j.helpers.OptionConverter.selectAndConfigure(OptionConverter.java:526)
	at org.apache.log4j.LogManager.<clinit>(LogManager.java:127)
	at org.slf4j.impl.Log4jLoggerFactory.<init>(Log4jLoggerFactory.java:66)
	at org.slf4j.impl.StaticLoggerBinder.<init>(StaticLoggerBinder.java:72)
	at org.slf4j.impl.StaticLoggerBinder.<clinit>(StaticLoggerBinder.java:45)
	at org.slf4j.LoggerFactory.bind(LoggerFactory.java:150)
	at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:124)
	at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:417)
	at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:362)
	at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:388)
	at org.apache.hadoop.conf.Configuration.<clinit>(Configuration.java:229)
	at org.apache.hadoop.hdfs.tools.GetConf.<clinit>(GetConf.java:131)
log4j:ERROR Could not instantiate appender named "EventCounter".

We need to clean up log4j.properties to avoid instantiating appender EventCounter.

Issue Links

• is related to: HADOOP-17524 Remove EventCounter and Log counters from JVM Metrics
• links to: GitHub Pull Request #2922