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https://issues.apache.org/jira/browse/SPARK-42754?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dongjoon Hyun closed SPARK-42754.
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> Spark 3.4 history server's SQL tab incorrectly groups SQL executions when
> replaying event logs from Spark 3.3 and earlier
> -------------------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-42754
> URL: https://issues.apache.org/jira/browse/SPARK-42754
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.4.0
> Reporter: Josh Rosen
> Assignee: Linhong Liu
> Priority: Blocker
> Fix For: 3.4.1
>
> Attachments: example.png
>
>
> In Spark 3.4.0 RC4, the Spark History Server's SQL tab incorrectly groups SQL
> executions when replaying event logs generated by older Spark versions.
>
> {*}Reproduction{*}:
> {{In ./bin/spark-shell --conf spark.eventLog.enabled=true --conf
> spark.eventLog.dir=eventlogs, run three non-nested SQL queries:}}
> {code:java}
> sql("select * from range(10)").collect()
> sql("select * from range(20)").collect()
> sql("select * from range(30)").collect(){code}
> Exit the shell and use the Spark History Server to replay this application's
> UI.
> In the SQL tab I expect to see three separate queries, but Spark 3.4's
> history server incorrectly groups the second and third queries as nested
> queries of the first (see attached screenshot).
>
> {*}Root cause{*}:
> [https://github.com/apache/spark/pull/39268] / SPARK-41752 added a new
> *non-optional* {{rootExecutionId: Long}} field to the
> SparkListenerSQLExecutionStart case class.
> When JsonProtocol deserializes this event it uses the "ignore missing
> properties" Jackson deserialization option, causing the
> {{rootExecutionField}} to be initialized with a default value of {{{}0{}}}.
> The value {{0}} is a legitimate execution ID, so in the deserialized event we
> have no ability to distinguish between the absence of a value and a case
> where all queries have the first query as the root.
> *Proposed* {*}fix{*}:
> I think we should change this field to be of type {{Option[Long]}} . I
> believe this is a release blocker for Spark 3.4.0 because we cannot change
> the type of this new field in a future release without breaking binary
> compatibility.
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