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https://issues.apache.org/jira/browse/SPARK-17669?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15524166#comment-15524166
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Sean Owen commented on SPARK-17669:
-----------------------------------
It's hard to say what is going on without knowing what you're executing. Lots
of things changed in 2.0, and it's not inconceivable that some things actually
go slower.
> Strange behavior using Datasets
> -------------------------------
>
> Key: SPARK-17669
> URL: https://issues.apache.org/jira/browse/SPARK-17669
> Project: Spark
> Issue Type: Bug
> Components: SQL, Web UI
> Affects Versions: 2.0.0
> Reporter: Miles Crawford
>
> I recently migrated my application to Spark 2.0, and everything worked well,
> except for one function that uses "toDS" and the ML libraries.
> This stage used to complete in 15 minutes or so on 1.6.2, and now takes
> almost two hours.
> The UI shows very strange behavior - completed stages still being worked on,
> concurrent work on tons of stages, including ones from downstream jobs:
> https://dl.dropboxusercontent.com/u/231152/spark.png
> The only source change I made was changing "toDF" to "toDS()" before handing
> my RDDs to the ML libraries.
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