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https://issues.apache.org/jira/browse/SPARK-21801?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16143624#comment-16143624
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Apache Spark commented on SPARK-21801:
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User 'felixcheung' has created a pull request for this issue:
https://github.com/apache/spark/pull/19018
> SparkR unit test randomly fail on trees
> ---------------------------------------
>
> Key: SPARK-21801
> URL: https://issues.apache.org/jira/browse/SPARK-21801
> Project: Spark
> Issue Type: Bug
> Components: SparkR, Tests
> Affects Versions: 2.2.0
> Reporter: Weichen Xu
> Priority: Critical
>
> SparkR unit test sometimes will randomly occur such error:
> ```
> 1. Error: spark.randomForest (@test_mllib_tree.R#236)
> --------------------------
> java.lang.IllegalArgumentException: requirement failed: The input column
> stridx_87ea3065aeb2 should have at least two distinct values.
> ```
> or
> ```
> 1. Error: spark.decisionTree (@test_mllib_tree.R#353)
> --------------------------
> java.lang.IllegalArgumentException: requirement failed: The input column
> stridx_d6a0b492cfa1 should have at least two distinct values.
> ```
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