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https://issues.apache.org/jira/browse/SPARK-18229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15629519#comment-15629519
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Sean Owen commented on SPARK-18229:
-----------------------------------
String.toSeq gives you a Scala WrappedString, which is not serializable. I
don't think that's a Spark problem per se. If you really mean to collect the
strings a sequence of chars, and can settle for a List, then toList happens to
result in a serializable object.
> Row.toSeq causes java.io.NotSerializableException
> -------------------------------------------------
>
> Key: SPARK-18229
> URL: https://issues.apache.org/jira/browse/SPARK-18229
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.0.0
> Reporter: Daniel Haviv
>
> issuing the following code causes a notSerializableException:
> val jsonRDD = sc.parallelize(Seq("{\"iid\":\"daniel\", \"seller\":\"stam\",
> \"bogus\":2, \"activity\":null, \"anotherField\":\"x\"}"))
> jsonRDD.map(r=>r.toSeq).collect
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