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https://issues.apache.org/jira/browse/SPARK-30444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17009370#comment-17009370
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Aman Omer commented on SPARK-30444:
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I am looking into this one.
> The same job will be computated for many times when using Dataset.show()
> ------------------------------------------------------------------------
>
> Key: SPARK-30444
> URL: https://issues.apache.org/jira/browse/SPARK-30444
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.4.3, 2.4.4
> Reporter: Dong Wang
> Priority: Major
>
> When I run the example sql.SparkSQLExample, df.show() at line 60 would
> trigger an action. On WebUI, I noticed that this API creates 5 jobs, all of
> which have the same lineage graph with the same RDDs and the same call
> stacks. That means Spark recomputates the job for 5 times. But strangely,
> sqlDF.show() at line 123 only creates 1 job.
> I don't know what happened at show() at line 60.
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