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https://issues.apache.org/jira/browse/SPARK-32283?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lorenz Bühmann updated SPARK-32283:
-----------------------------------
Priority: Minor (was: Major)
> Multiple Kryo registrators can't be used anymore
> ------------------------------------------------
>
> Key: SPARK-32283
> URL: https://issues.apache.org/jira/browse/SPARK-32283
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 3.0.0
> Reporter: Lorenz Bühmann
> Priority: Minor
>
> This is a regression in Spark 3.0 as it is working with Spark 2.
> According to the docs, it should be possible to register multiple Kryo
> registrators via Spark config option spark.kryo.registrator .
> In Spark 3.0 the code to parse Kryo config options has been refactored into
> Scala class
> [Kryo|https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/internal/config/Kryo.scala].
> The code to parse the registrators is in [Line
> 29-32|https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/internal/config/Kryo.scala#L29-L32]
> {code:scala}
> val KRYO_USER_REGISTRATORS = ConfigBuilder("spark.kryo.registrator")
> .version("0.5.0")
> .stringConf
> .createOptional
> {code}
> but it should be
> {code:scala}
> val KRYO_USER_REGISTRATORS = ConfigBuilder("spark.kryo.registrator")
> .version("0.5.0")
> .stringConf
> .toSequence
> .createOptional
> {code}
> to split the comma seprated list.
> In previous Spark 2.x it was done differently directly in [KryoSerializer
> Line
> 77-79|https://github.com/apache/spark/blob/branch-2.4/core/src/main/scala/org/apache/spark/serializer/KryoSerializer.scala#L77-L79]
> {code:scala}
> private val userRegistrators = conf.get("spark.kryo.registrator", "")
> .split(',').map(_.trim)
> .filter(!_.isEmpty)
> {code}
> Hope this helps.
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