HeartSaVioR commented on a change in pull request #25943: 
[WIP][SPARK-29261][SQL][CORE] Support recover live entities from KVStore for 
(SQL)AppStatusListener
URL: https://github.com/apache/spark/pull/25943#discussion_r332311018
 
 

 ##########
 File path: core/src/main/scala/org/apache/spark/status/storeTypes.scala
 ##########
 @@ -95,6 +151,65 @@ private[spark] class StageDataWrapper(
 
   @JsonIgnore @KVIndex("completionTime")
   private def completionTime: Long = 
info.completionTime.map(_.getTime).getOrElse(-1L)
+
+  def toLiveStage(jobs: Seq[LiveJob]): LiveStage = {
+    val liveStage = new LiveStage
+    val firstLaunchTime = if (info.firstTaskLaunchedTime.isEmpty) {
+      Long.MaxValue
+    } else {
+      info.firstTaskLaunchedTime.get.getTime
+    }
+    val metrics = LiveEntityHelpers.createMetrics(
+      info.executorDeserializeTime,
+      info.executorDeserializeCpuTime,
+      info.executorRunTime,
+      info.executorCpuTime,
+      info.resultSize,
+      info.jvmGcTime,
+      info.resultSerializationTime,
+      info.memoryBytesSpilled,
+      info.diskBytesSpilled,
+      info.peakExecutionMemory,
+      info.inputBytes,
+      info.inputRecords,
+      info.outputBytes,
+      info.outputRecords,
+      info.shuffleRemoteBlocksFetched,
+      info.shuffleLocalBlocksFetched,
+      info.shuffleFetchWaitTime,
+      info.shuffleRemoteBytesRead,
+      info.shuffleRemoteBytesReadToDisk,
+      info.shuffleLocalBytesRead,
+      info.shuffleReadRecords,
+      info.shuffleWriteBytes,
+      info.shuffleWriteTime,
+      info.shuffleWriteRecords
+    )
+    val stageInfo = new StageInfo(
+      info.stageId,
+      info.attemptId,
+      info.name,
+      info.numTasks,
+      Nil, // rddInfo
+      Nil, // parentIds
 
 Review comment:
   `parentIds`, `taskMetrics`, `taskLocalityPreference`, `shuffleDepId` are not 
assigned here as well. May want to leave comments to ensure we're OK with this.

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