dongjoon-hyun commented on a change in pull request #35109:
URL: https://github.com/apache/spark/pull/35109#discussion_r779241180
##########
File path:
resource-managers/kubernetes/core/src/main/scala/org/apache/spark/scheduler/cluster/k8s/ExecutorRollPlugin.scala
##########
@@ -116,7 +117,39 @@ class ExecutorRollDriverPlugin extends DriverPlugin with
Logging {
listWithoutDriver.sortBy(e => e.totalDuration.toFloat / Math.max(1,
e.totalTasks)).reverse
case ExecutorRollPolicy.FAILED_TASKS =>
listWithoutDriver.sortBy(_.failedTasks).reverse
+ case ExecutorRollPolicy.OUTLIER =>
+ // We build multiple outlier lists and concat in the following
importance order to find
+ // outliers in various perspective:
+ // AVERAGE_DURATION > TOTAL_DURATION > TOTAL_GC_TIME > FAILED_TASKS
+ // Since we will choose only first item, the duplication is okay. If
there is no outlier,
+ // We fallback to TOTAL_DURATION policy.
+ outliers(listWithoutDriver.filter(_.totalTasks > 0), e =>
e.totalDuration / e.totalTasks) ++
+ outliers(listWithoutDriver, e => e.totalDuration) ++
+ outliers(listWithoutDriver, e => e.totalGCTime) ++
+ outliers(listWithoutDriver, e => e.failedTasks) ++
+ listWithoutDriver.sortBy(_.totalDuration).reverse
}
sortedList.headOption.map(_.id)
}
+
+ /**
+ * Return executors whose metrics is outstanding, '(value - mean) >
2-sigma'. This is a
Review comment:
Sure. It came from a famous ephemeral rule for outlier. 2-sigma is `95%`
coverage.
- https://en.wikipedia.org/wiki/68–95–99.7_rule
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