hello,  i'm using cloudera quickstart vm when i try to start the namenode using terminal , i get this Error :   [cloudera@quickstart conf]$ sudo service hadoop-hdfs-namenode start starting namenode, logging to /var/log/hadoop-hdfs/hadoop-hdfs-namenode-quickstart.cloudera.out log4j:ERROR Could not find value for key log4j.appender.RFA log4j:ERROR Could not instantiate appender named "RFA". log4j:WARN No appenders could be found for logger (org.apache.hadoop.hdfs.server.namenode.NameNode). log4j:WARN Please initialize the log4j system properly. log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info. Failed to start Hadoop namenode. Return value: 1 [FAILED]   i think that the probleme is log4j.properties file ? Thanks for your help, ... View more