Github user dosoft commented on a diff in the pull request:
    --- Diff: 
core/src/main/scala/org/apache/spark/scheduler/EventLoggingListener.scala ---
    @@ -137,7 +138,13 @@ private[spark] class EventLoggingListener(
         // scalastyle:on println
         if (flushLogger) {
    -      hadoopDataStream.foreach(_.hflush())
    +      hadoopDataStream.foreach(ds => {
    --- End diff --
    hsync() is even stronger than hflush(), since under the cover both methods 
use the same flushOrSync(), but hsync performs an additional tasks like 
flushing OS buffers (fsync).

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