Github user tgravescs commented on a diff in the pull request:
https://github.com/apache/spark/pull/4688#discussion_r25526585
--- Diff: yarn/src/main/scala/org/apache/spark/deploy/yarn/Client.scala ---
@@ -540,6 +561,29 @@ private[spark] class Client(
amContainer
}
+ def setupCredentials(): Unit = {
+ Option(args.principal) match {
+ case Some(principal) =>
+ Option(args.keytab) match {
+ case Some(keytabPath) =>
+ // Generate a file name that can be used for the keytab file,
that does not conflict
+ // with any user file.
+ logInfo("Attempting to login to the Kerberos" +
+ s" using principal: $principal and keytab: $keytabPath")
+ val f = new File(keytabPath)
+ keytabFileName = f.getName + "-" + System.currentTimeMillis()
+ val ugi =
UserGroupInformation.loginUserFromKeytabAndReturnUGI(principal, keytabPath)
+ credentials = ugi.getCredentials
+ loginFromKeytab = true
+ logInfo("Successfully logged into Kerberos.")
--- End diff --
are we doing this login just to confirm keytab valid? otherwise login
isn't necessary as user must kinit first anyway.
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