Github user HeartSaVioR commented on a diff in the pull request: https://github.com/apache/spark/pull/21721#discussion_r206009928 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/ProgressReporter.scala --- @@ -143,18 +150,50 @@ trait ProgressReporter extends Logging { } logDebug(s"Execution stats: $executionStats") + // extracts custom metrics from readers and writers + def extractMetrics(getMetrics: () => CustomMetrics, + onInvalidMetrics: (Exception) => Unit): Option[JValue] = { + val metrics = getMetrics() + if (metrics != null) { + try { + Some(parse(metrics.json())) + } catch { + case ex: Exception => onInvalidMetrics(ex) --- End diff -- https://github.com/databricks/scala-style-guide#exception-handling-try-vs-try According to the guide, this line needs to be replaced with `case NonFatal(e) =>`, and I'd place `onInvalidMetrics` and `None` to same indentation.
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