Lorenz Bühmann created SPARK-32283:
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Summary: 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
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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