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https://issues.apache.org/jira/browse/SPARK-18840?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15744370#comment-15744370
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Saisai Shao edited comment on SPARK-18840 at 12/13/16 9:30 AM:
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This problem also existed in branch 1.6, but the fix is a little different
compared to master.
was (Author: jerryshao):
This problem also existed in branch 1.6, but the fix is a little complicated
compared to master.
> HDFSCredentialProvider throws exception in non-HDFS security environment
> ------------------------------------------------------------------------
>
> Key: SPARK-18840
> URL: https://issues.apache.org/jira/browse/SPARK-18840
> Project: Spark
> Issue Type: Bug
> Components: YARN
> Affects Versions: 1.6.3, 2.1.0
> Reporter: Saisai Shao
> Priority: Minor
>
> Current in {{HDFSCredentialProvider}}, the code logic assumes HDFS delegation
> token should be existed, this is ok for HDFS environment, but for some cloud
> environment like Azure, HDFS is not required, so it will throw exception:
> {code}
> java.util.NoSuchElementException: head of empty list
> at scala.collection.immutable.Nil$.head(List.scala:337)
> at scala.collection.immutable.Nil$.head(List.scala:334)
> at
> org.apache.spark.deploy.yarn.Client.getTokenRenewalInterval(Client.scala:627)
> {code}
> We should also consider this situation.
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