Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/4688#discussion_r25979305
--- Diff:
yarn/src/main/scala/org/apache/spark/deploy/yarn/YarnSparkHadoopUtil.scala ---
@@ -82,6 +100,179 @@ class YarnSparkHadoopUtil extends SparkHadoopUtil {
if (credentials != null) credentials.getSecretKey(new Text(key)) else
null
}
+ private[spark] override def scheduleLoginFromKeytab(): Unit = {
+ sparkConf.getOption("spark.yarn.principal").foreach { principal =>
+ val keytab = sparkConf.get("spark.yarn.keytab")
+ val delegationTokenRenewerRunnable =
+ new Runnable {
+ override def run(): Unit = {
+ renewCredentials(principal, keytab)
+ delegationTokenRenewer.schedule(
+ this, (0.75 * (getLatestValidity -
System.currentTimeMillis())).toLong,
+ TimeUnit.MILLISECONDS)
+ }
+ }
+ val timeToRenewal = (0.75 * (getLatestValidity -
System.currentTimeMillis())).toLong
+ delegationTokenRenewer.schedule(
+ delegationTokenRenewerRunnable, timeToRenewal,
TimeUnit.MILLISECONDS)
+ }
+ }
+
+ private def renewCredentials(principal: String, keytab: String): Unit = {
--- End diff --
Could you add a comment somewhere in the code about how the credentials
update work? That will make it easier for someone trying to understand this
code later.
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