Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/18616#discussion_r127294479
--- Diff:
resource-managers/yarn/src/main/scala/org/apache/spark/deploy/yarn/ApplicationMaster.scala
---
@@ -674,6 +671,43 @@ private[spark] class ApplicationMaster(
allocatorLock.notifyAll()
}
+ private def startAMCredentialRenewer(): Unit = {
+ // If the credentials file config is present, we must periodically
renew tokens. So create
+ // a new AMDelegationTokenRenewer
+ if (sparkConf.contains(CREDENTIALS_FILE_PATH.key)) {
+ // If a principal and keytab have been set, use that to create new
credentials for executors
+ // periodically
+ val credentialManager = new YARNHadoopDelegationTokenManager(
+ sparkConf,
+ yarnConf,
+ () => YarnSparkHadoopUtil.get.hadoopFSsToAccess(sparkConf,
yarnConf))
+
+ val credentialRenewer = new AMCredentialRenewer(sparkConf, yarnConf,
credentialManager)
+ credentialRenewer.scheduleLoginFromKeytab()
+ }
+ }
+
+ private def startAMCredentialRenewerThread(): Thread = {
--- End diff --
Can you add comments explaining this is done so that `AMCredentialRenewer`
picks up the custom class loader? This thread will be very short-lived, so it
would be nice to explain why it's needed.
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