Github user squito commented on a diff in the pull request: https://github.com/apache/spark/pull/21221#discussion_r207004013 --- Diff: core/src/main/scala/org/apache/spark/status/AppStatusListener.scala --- @@ -669,6 +686,34 @@ private[spark] class AppStatusListener( } } } + + // check if there is a new peak value for any of the executor level memory metrics + // for the live UI. SparkListenerExecutorMetricsUpdate events are only processed + // for the live UI. + event.executorUpdates.foreach { updates: ExecutorMetrics => + liveExecutors.get(event.execId).foreach { exec: LiveExecutor => + if (exec.peakExecutorMetrics.compareAndUpdatePeakValues(updates)) { + maybeUpdate(exec, now) + } + } + } + } + + override def onStageExecutorMetrics(executorMetrics: SparkListenerStageExecutorMetrics): Unit = { + val now = System.nanoTime() + + // check if there is a new peak value for any of the executor level memory metrics, + // while reading from the log. SparkListenerStageExecutorMetrics are only processed + // when reading logs. + liveExecutors.get(executorMetrics.execId) + .orElse(deadExecutors.get(executorMetrics.execId)) match { + case Some(exec) => + if (exec.peakExecutorMetrics.compareAndUpdatePeakValues(executorMetrics.executorMetrics)) { + maybeUpdate(exec, now) --- End diff -- this is only for replaying from logs, right? but then, `maybeUpdate` will be a no-op, as `live` is false. So, what is the desired effect here? But maybe I'm missing something, because this is covered by the some of the api tests. I think maybe you don't need to call update at all here, and it'll just get written to the kvstore as part of the final `flush` call when the kvstore is closed after reading the whole log. also style nit: indentation is off
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