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https://issues.apache.org/jira/browse/SPARK-23978?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Richard Wilkinson updated SPARK-23978:
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Attachment: kryo_stats.png
> Kryo much slower when mllib jar not on classpath
> ------------------------------------------------
>
> Key: SPARK-23978
> URL: https://issues.apache.org/jira/browse/SPARK-23978
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.3.0
> Environment: Windows 10, Java 8
> Reporter: Richard Wilkinson
> Priority: Major
> Attachments: kryo_stats.png
>
>
> Spark 2.3 added a bunch of org.apache.spark.ml and org.apache.spark.mllib
> classes to the kryo registration, but it does this via class.forName.
> If the mllib jar is not on the classpath, this can be very slow.
> My app, which is using GraphX connected components function is 2x slower in
> 2.3 than 2.2.1
>
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