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

    https://github.com/apache/spark/pull/5792#discussion_r31367238
  
    --- Diff: 
core/src/main/scala/org/apache/spark/deploy/history/ApplicationHistoryProvider.scala
 ---
    @@ -62,4 +65,12 @@ private[history] abstract class 
ApplicationHistoryProvider {
        */
       def getConfig(): Map[String, String] = Map()
     
    +  /**
    +   * Writes out the event logs to the output stream provided. The logs 
will be compressed into a
    --- End diff --
    
    Isn't that an implementation detail?
    
    Or, if you want to enforce a zip file as the output, shouldn't it be a 
`ZipOutputStream`? That actually sounds better since then it enforces a 
stronger contract regardless of the underlying provider implementation. 
Otherwise different providers may decide to return different types of files.


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