Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/4688#discussion_r25914669
--- Diff:
yarn/src/main/scala/org/apache/spark/deploy/yarn/YarnSparkHadoopUtil.scala ---
@@ -82,6 +102,180 @@ class YarnSparkHadoopUtil extends SparkHadoopUtil {
if (credentials != null) credentials.getSecretKey(new Text(key)) else
null
}
+ private[spark] override def scheduleLoginFromKeytab(): Unit = {
+ val principal = System.getenv("SPARK_PRINCIPAL")
+ val keytab = System.getenv("SPARK_KEYTAB")
+ if (principal != null) {
+ val delegationTokenRenewerThread =
+ new Runnable {
+ override def run(): 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 stagingDirPath =
+ new Path(remoteFs.getHomeDirectory,
System.getenv("SPARK_YARN_STAGING_DIR"))
+ val tokenPathStr = sparkConf.get("spark.yarn.credentials.file")
--- End diff --
Couldn't you set `spark.yarn.credentials.file` to the full URL and avoid
having to look at `SPARK_YARN_STAGING_DIR` in multiple places?
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