Edit your conf/log4j.properties file and Change the following line:
log4j.rootCategory=INFO, console
to
log4j.rootCategory=ERROR, console
Another approach would be to :
Fireup spark-shell and type in the following:
import org.apache.log4j.Logger
import org.apache.log4j.Level
Logger.getLogger("org").setLevel(Level.OFF)
Logger.getLogger("akka").setLevel(Level.OFF)
You won't see any logs after that.
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