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

    https://github.com/apache/spark/pull/22180#discussion_r212790082
  
    --- Diff: 
resource-managers/yarn/src/main/scala/org/apache/spark/deploy/yarn/config.scala 
---
    @@ -192,6 +192,12 @@ package object config {
         .toSequence
         .createWithDefault(Nil)
     
    +  private[spark] val AM_FINAL_MSG_LIMIT = 
ConfigBuilder("spark.yarn.am.finalMessageLimit")
    +    .doc("The limit size of final diagnostic message for our 
ApplicationMaster to unregister from" +
    +      " the ResourceManager.")
    +    .bytesConf(ByteUnit.BYTE)
    +    .createWithDefaultString("1m")
    --- End diff --
    
    Sorry for leaving a comment late, and nitpicking but shouldn't we better 
leave this unlimited by default?


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