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https://issues.apache.org/jira/browse/SPARK-24149?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16847929#comment-16847929
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Dhruve Ashar commented on SPARK-24149:
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I also think that HDFS client shouldn't be figuring out if HA is enabled and
then add both the NNs to the list.
> Automatic namespaces discovery in HDFS federation
> -------------------------------------------------
>
> Key: SPARK-24149
> URL: https://issues.apache.org/jira/browse/SPARK-24149
> Project: Spark
> Issue Type: Improvement
> Components: YARN
> Affects Versions: 2.4.0
> Reporter: Marco Gaido
> Assignee: Marco Gaido
> Priority: Minor
> Fix For: 2.4.0
>
>
> Hadoop 3 introduced HDFS federation.
> Spark fails to write on different namespaces when Hadoop federation is turned
> on and the cluster is secure. This happens because Spark looks for the
> delegation token only for the defaultFS configured and not for all the
> available namespaces. A workaround is the usage of the property
> {{spark.yarn.access.hadoopFileSystems}}.
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