Github user jiangxb1987 commented on a diff in the pull request:
https://github.com/apache/spark/pull/18648#discussion_r132150474
--- Diff: core/src/main/scala/org/apache/spark/deploy/SparkHadoopUtil.scala
---
@@ -136,8 +136,15 @@ class SparkHadoopUtil extends Logging {
def getSecretKeyFromUserCredentials(key: String): Array[Byte] = { null }
- def loginUserFromKeytab(principalName: String, keytabFilename: String) {
- UserGroupInformation.loginUserFromKeytab(principalName, keytabFilename)
+ def loginUserFromKeytab(principalName: String, keytabFilename: String):
Unit = {
+ if (!new File(keytabFilename).exists()) {
+ throw new SparkException(s"Keytab file: ${keytabFilename}" +
+ " specified in spark.yarn.keytab does not exist")
--- End diff --
nit: To be general, let's not mention the config name `spark.yarn.keytab`
here.
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