vanzin opened a new pull request #23689: [SPARK-25689][core] Follow up: don't get delegation tokens when kerberos not available. URL: https://github.com/apache/spark/pull/23689 This avoids trying to get delegation tokens when a TGT is not available, e.g. when running in yarn-cluster mode without a keytab. That would result in an error since that is not allowed. Tested with some (internal) integration tests that started failing with the patch for SPARK-25689.
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