Github user jodersky commented on a diff in the pull request:

    https://github.com/apache/spark/pull/12557#discussion_r60700056
  
    --- Diff: core/src/main/scala/org/apache/spark/util/SignalLogger.scala ---
    @@ -17,44 +17,20 @@
     
     package org.apache.spark.util
     
    -import org.apache.commons.lang3.SystemUtils
     import org.slf4j.Logger
    -import sun.misc.{Signal, SignalHandler}
     
     /**
      * Used to log signals received. This can be very useful in debugging 
crashes or kills.
    - *
    - * Inspired by Colin Patrick McCabe's similar class from Hadoop.
      */
     private[spark] object SignalLogger {
    --- End diff --
    
    I kept it because logging is called from more than one place (two to be 
precise)


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