012huang opened a new pull request #25949: [SPARK-29273] set the right peakExecutionMemory value when the task end URL: https://github.com/apache/spark/pull/25949 in TaskMetrics, there is a exposed metrics peakExecutionMemory, but the value never been set. when a task is finished, it generate a SparkListenerTaskEnd event info, incuding the metrics value. actually the peakExecutionMemory is stored in the Accumulables which is a member of TaskInfo. so when parse the SparkListenerTaskEnd event, we can get the `internal.metrics.peakExecutionMemory` value from the parsed taskInfo object, and set back to the TaskMetricsInfo with supply a setPeakExecutionMemory method.
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