dongjoon-hyun commented on code in PR #51604:
URL: https://github.com/apache/spark/pull/51604#discussion_r2223853069


##########
core/src/main/scala/org/apache/spark/deploy/history/FsHistoryProvider.scala:
##########
@@ -364,6 +375,16 @@ private[history] class FsHistoryProvider(conf: SparkConf, 
clock: Clock)
     Some(loadedUI)
   }
 
+  private def loadFromFallbackLocation(appId: String, attemptId: 
Option[String], logPath: String)
+    : ApplicationInfoWrapper = {
+    val date = new Date(0)
+    val info = ApplicationAttemptInfo(attemptId, date, date, date, 0, "spark", 
false, "unknown")
+    addListing(new ApplicationInfoWrapper(
+      ApplicationInfo(appId, appId, None, None, None, None, List.empty),
+      List(new AttemptInfoWrapper(info, logPath, 0, Some(1), None, None, None, 
None))))

Review Comment:
   Just questions to understand your use cases:
   - How do you handle Spark Streaming Jobs with a single file event log ? 
Still your job doesn't use rolling event logs?
   - Are you assuming only Spark 2.x or 3.x jobs because Spark 4 jobs generates 
rolling events by default since SPARK-45771?



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