[jira] [Created] (SPARK-25645) Add provision to disable EventLoggingListener default flush/hsync/hflush for all events

["Devaraj K (JIRA)" <ji...@apache.org>]

Devaraj K created SPARK-25645:
---------------------------------

             Summary: Add provision to disable EventLoggingListener default flush/hsync/hflush for all events
                 Key: SPARK-25645
                 URL: https://issues.apache.org/jira/browse/SPARK-25645
             Project: Spark
          Issue Type: Improvement
          Components: Spark Core
    Affects Versions: 2.3.2
            Reporter: Devaraj K


{code:java|title=EventLoggingListener.scala|borderStyle=solid}
private def logEvent(event: SparkListenerEvent, flushLogger: Boolean = false) {
    val eventJson = JsonProtocol.sparkEventToJson(event)
    // scalastyle:off println
    writer.foreach(_.println(compact(render(eventJson))))
    // scalastyle:on println
    if (flushLogger) {
      writer.foreach(_.flush())
      hadoopDataStream.foreach(ds => ds.getWrappedStream match {
        case wrapped: DFSOutputStream => wrapped.hsync(EnumSet.of(SyncFlag.UPDATE_LENGTH))
        case _ => ds.hflush()
      })
    }
{code}
There are events which come with flushLogger=true and go through the underlying stream flush, Here I tried running apps with disabling the flush/hsync/hflush for all events and see that there is significant improvement in the app completion time and also there are no event drops, posting more details in the comments section.



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