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

    https://github.com/apache/spark/pull/21221#discussion_r198683408
  
    --- Diff: core/src/main/scala/org/apache/spark/status/api/v1/api.scala ---
    @@ -98,14 +102,48 @@ class ExecutorSummary private[spark](
         val removeReason: Option[String],
         val executorLogs: Map[String, String],
         val memoryMetrics: Option[MemoryMetrics],
    -    val blacklistedInStages: Set[Int])
    +    val blacklistedInStages: Set[Int],
    +    @JsonSerialize(using = classOf[PeakMemoryMetricsSerializer])
    +    @JsonDeserialize(using = classOf[PeakMemoryMetricsDeserializer])
    +    val peakMemoryMetrics: Option[Array[Long]])
     
     class MemoryMetrics private[spark](
         val usedOnHeapStorageMemory: Long,
         val usedOffHeapStorageMemory: Long,
         val totalOnHeapStorageMemory: Long,
         val totalOffHeapStorageMemory: Long)
     
    +/** deserialzer for peakMemoryMetrics: convert to array ordered by metric 
name */
    +class PeakMemoryMetricsDeserializer private[spark] extends 
JsonDeserializer[Option[Array[Long]]] {
    --- End diff --
    
    This is odd, but I can't seem to comment on your earlier comment. Regarding 
having a serializer/deserializer, I also don't have strong feelings -- it makes 
it more readable, but also takes up more space in the history log.
    
    Regarding this comment, thanks, I hadn't realized the placement meant that 
it marked the constructor. It's meant for the class, and I'll move.


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