Github user harishreedharan commented on a diff in the pull request:
https://github.com/apache/spark/pull/4688#discussion_r25971108
--- 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 = {
+ if (!loggedInViaKeytab) {
+ // Keytab is copied by YARN to the working directory of the AM, so
full path is
+ // not needed.
+ loggedInUGI = UserGroupInformation.loginUserFromKeytabAndReturnUGI(
+ principal, keytab)
+ loggedInViaKeytab = true
+ }
+ val nns = getNameNodesToAccess(sparkConf)
+ val newCredentials = loggedInUGI.getCredentials
+ obtainTokensForNamenodes(nns, conf, newCredentials)
+ val remoteFs = FileSystem.get(conf)
+ val nextSuffix = lastCredentialsFileSuffix + 1
+ val tokenPathStr =
+ sparkConf.get("spark.yarn.credentials.file") + "-" + nextSuffix
+ val tokenPath = new Path(tokenPathStr)
+ val tempTokenPath = new Path(tokenPathStr + ".tmp")
+ val stream = Option(remoteFs.create(tempTokenPath, true))
--- End diff --
The reason I am being null-safe is that we have seen this happen where the
create method sometimes does not throw, but returns null. I believe this may
have been a Hadoop bug, best to avoid it.
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