Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/10267#discussion_r47409560
--- Diff:
core/src/main/scala/org/apache/spark/deploy/client/AppClient.scala ---
@@ -123,7 +128,7 @@ private[spark] class AppClient(
* nthRetry means this is the nth attempt to register with master.
*/
private def registerWithMaster(nthRetry: Int) {
- registerMasterFutures.set(tryRegisterAllMasters())
+ registerMasterFutures.set(tryRegisterAllMasters().flatMap(x => x))
--- End diff --
can be just `.flatten`
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