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From "Richard Wilkinson (JIRA)" <>
Subject [jira] [Created] (SPARK-23978) Kryo much slower when mllib jar not on classpath
Date Fri, 13 Apr 2018 12:48:00 GMT
Richard Wilkinson created SPARK-23978:

             Summary: Kryo much slower when mllib jar not on classpath
                 Key: SPARK-23978
             Project: Spark
          Issue Type: Bug
          Components: Spark Core
    Affects Versions: 2.3.0
         Environment: Windows 10, Java 8
            Reporter: Richard Wilkinson
         Attachments: kryo_stats.png

Spark 2.3 added a bunch of 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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