Github user wangmiao1981 commented on the issue:

    https://github.com/apache/spark/pull/14433
  
    @felixcheung I checked which object calls the log and print message 
accordingly.
    
    ./bin/sparkR
    
    R version 3.3.0 (2016-05-03) -- "Supposedly Educational"
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    Platform: x86_64-apple-darwin13.4.0 (64-bit)
    
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    [Previously saved workspace restored]
    
    Launching java with spark-submit command 
/Users/mwang/spark_ws_0904/bin/spark-submit   "sparkr-shell" 
/var/folders/s_/83b0sgvj2kl2kwq4stvft_pm0000gn/T//Rtmpi4dP8y/backend_portb9fa113abad2
 
    Using Spark's default log4j profile: 
org/apache/spark/log4j-defaults.properties
    Setting default log level to "WARN".
    To adjust logging level use setLogLevel(newLevel).
    
    ./bin/spark-shell 
    Using Spark's default log4j profile: 
org/apache/spark/log4j-defaults.properties
    Setting default log level to "WARN".
    To adjust logging level use sc.setLogLevel(newLevel).
    
    ./bin/pyspark 
    Python 2.7.11 |Anaconda 2.4.0 (x86_64)| (default, Dec  6 2015, 18:57:58) 
    [GCC 4.2.1 (Apple Inc. build 5577)] on darwin
    Type "help", "copyright", "credits" or "license" for more information.
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    Using Spark's default log4j profile: 
org/apache/spark/log4j-defaults.properties
    Setting default log level to "WARN".
    To adjust logging level use sc.setLogLevel(newLevel).


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