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https://issues.apache.org/jira/browse/SPARK-3788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14158707#comment-14158707
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Apache Spark commented on SPARK-3788:
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User 'vanzin' has created a pull request for this issue:
https://github.com/apache/spark/pull/2649
> Yarn dist cache code is not friendly to HDFS HA, Federation
> -----------------------------------------------------------
>
> Key: SPARK-3788
> URL: https://issues.apache.org/jira/browse/SPARK-3788
> Project: Spark
> Issue Type: Bug
> Components: YARN
> Reporter: Marcelo Vanzin
> Assignee: Marcelo Vanzin
>
> There are two bugs here.
> 1. The {{compareFs()}} method in ClientBase considers the 'host' part of the
> URI to be an actual host. In the case of HA and Federation, that's a
> namespace name, which doesn't resolve to anything. So in those cases,
> {{compareFs()}} always says the file systems are different.
> 2. In {{prepareLocalResources()}}, when adding a file to the distributed
> cache, that is done with the common FileSystem object instantiated at the
> start of the method. In the case of Federation that doesn't work: the
> qualified URL's scheme may differ from the non-qualified one, so the
> FileSystem instance will not work.
> Fixes are pretty trivial.
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