squito commented on a change in pull request #23767: [SPARK-26329][CORE] Faster
polling of executor memory metrics.
URL: https://github.com/apache/spark/pull/23767#discussion_r269273325
##########
File path: core/src/test/scala/org/apache/spark/executor/ExecutorSuite.scala
##########
@@ -392,6 +457,17 @@ class ExecutorSuite extends SparkFunSuite
uncaughtExceptionHandler = mockUncaughtExceptionHandler)
// the task will be launched in a dedicated worker thread
executor.launchTask(mockBackend, taskDescription)
+ if (poll) {
+ // Ensure that the executor's metricsPoller is polled at least once so
that values are
+ // recorded for the task metrics.
+ // When the task fails, peak values for these metrics get sent in the
TaskFailedReason.
+ val executorClass = classOf[Executor]
+ val metricsPollerField =
+
executorClass.getDeclaredField("org$apache$spark$executor$Executor$$metricsPoller")
+ metricsPollerField.setAccessible(true)
+ val metricsPoller =
metricsPollerField.get(executor).asInstanceOf[ExecutorMetricsPoller]
Review comment:
rather than using reflection here, just widen the visibility of the field in
`Executor` to
```scala
// Visible for testing
private[executor] metricsPoller
```
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