No appenders could be found for logger (org.apache.hadoop.ipc.Server)

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No appenders could be found for logger (org.apache.hadoop.ipc.Server)

Gleb Zhukov
Hello. I use hadoop 2.6.0+cdh5.8.0 with standard log4j config and faced with WARN messages in job logs:

log4j:WARN No appenders could be found for logger (org.apache.hadoop.ipc.Server).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

Command for example: yarn jar hadoop-examples.jar pi 16 1000
Does anyone know some solution for disable such WARN  messages? Thx!