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https://issues.apache.org/jira/browse/SPARK-24809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16547337#comment-16547337
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zenglinxi commented on SPARK-24809:
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[^Spark LongHashedRelation serialization.svg]
I think it's a hidden but critical bug that may cause data error.
> Serializing LongHashedRelation in executor may result in data error
> -------------------------------------------------------------------
>
> Key: SPARK-24809
> URL: https://issues.apache.org/jira/browse/SPARK-24809
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.0.0, 2.1.0, 2.2.0, 2.3.0
> Environment: Spark 2.2.1
> hadoop 2.7.1
> Reporter: Lijia Liu
> Priority: Critical
> Attachments: Spark LongHashedRelation serialization.svg
>
>
> When join key is long or int in broadcast join, Spark will use
> LongHashedRelation as the broadcast value. Details see SPARK-14419. But, if
> the broadcast value is abnormal big, executor will serialize it to disk. But,
> data will lost when serializing.
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