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https://issues.apache.org/jira/browse/SPARK-20191?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15952476#comment-15952476
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Apache Spark commented on SPARK-20191:
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User 'vanzin' has created a pull request for this issue:
https://github.com/apache/spark/pull/17508
> RackResolver not correctly being overridden in YARN tests
> ---------------------------------------------------------
>
> Key: SPARK-20191
> URL: https://issues.apache.org/jira/browse/SPARK-20191
> Project: Spark
> Issue Type: Bug
> Components: YARN
> Affects Versions: 2.0.3, 2.1.1, 2.2.0
> Reporter: Marcelo Vanzin
>
> YARN tests currently try to override YARN's RackResolver, but that class
> self-initializes the first time it's called, storing state in static
> variables and ignoring any further config params that might override the
> initial behavior.
> So we need a better solution for Spark tests, so that tests such as
> {{LocalityPlacementStrategySuite}} don't flood the DNS server with requests
> (making the test really slow in certain environments).
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