Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/21635#discussion_r198626433
--- Diff:
resource-managers/yarn/src/main/scala/org/apache/spark/deploy/yarn/ApplicationMaster.scala
---
@@ -309,6 +312,9 @@ private[spark] class ApplicationMaster(args:
ApplicationMasterArguments) extends
finish(FinalApplicationStatus.FAILED,
ApplicationMaster.EXIT_UNCAUGHT_EXCEPTION,
"Uncaught exception: " + StringUtils.stringifyException(e))
+ } finally {
+ metricsSystem.report()
--- End diff --
`metricsSystem` can be null at this point, can't it? in case of some issue
during startup.
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