Github user harishreedharan commented on a diff in the pull request:
https://github.com/apache/spark/pull/8867#discussion_r40705866
--- Diff:
yarn/src/main/scala/org/apache/spark/deploy/yarn/ExecutorDelegationTokenUpdater.scala
---
@@ -76,7 +76,10 @@ private[spark] class ExecutorDelegationTokenUpdater(
SparkHadoopUtil.get.getTimeFromNowToRenewal(
sparkConf, 0.8,
UserGroupInformation.getCurrentUser.getCredentials)
if (timeFromNowToRenewal <= 0) {
- executorUpdaterRunnable.run()
+ // If the `timeFromNowToRenewal` equals 0, it's better to wait 1
minutes to schedule for
+ // avoid cycle calling and cause StackOverflow Exception.
--- End diff --
We end up scheduling the next run of the `executorUpdaterRunnable` from
within this class. If the executor renewal interval is set to 0, we end up
calling it again from within the same thread (indefinitely). But I am not sure
why it would be 0 here though (since this is started only if the login is from
keytab).
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