FAQ
After I updated and reboot my server, Ubuntu 12.04 precise with CDH4 and
Cloudera Manager,
I got the services reports in cloudera manager said the health of hdfs/
mapreduce/ zookeeper are BAD.
Now I stopped all services.

I tried to format the namenode and restart hdfs services again but I got
the errors said:
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 Pleas initialize the log4j system properly.
log4j:WARN See htt0p://loggging.apache.org/log4j/1.2/faq.html#noconfig for
more info.

I tried to google for the solution but I found nothing.
Please help.

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postedMay 16, '13 at 7:33a
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