Github user tgravescs commented on a diff in the pull request:
https://github.com/apache/spark/pull/4688#discussion_r28961772
--- Diff:
yarn/src/main/scala/org/apache/spark/deploy/yarn/ApplicationMaster.scala ---
@@ -138,6 +140,12 @@ private[spark] class ApplicationMaster(
// doAs in order for the credentials to be passed on to the executor
containers.
val securityMgr = new SecurityManager(sparkConf)
+ // If the credentials file config is present, we must periodically
renew tokens. So create
+ // a new AMDelegationTokenRenewer
+ if(sparkConf.contains("spark.yarn.credentials.file")) {
--- End diff --
nit, space after if
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