[jira] [Created] (SPARK-30444) The same job will be computated for many times when using Dataset.show()

["Dong Wang (Jira)" <ji...@apache.org>]

Dong Wang created SPARK-30444:
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             Summary: 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: 2.4.4, 2.4.3
            Reporter: Dong Wang


When I run the example sql.SparkSQLExample, df.show() at line 60 would trigger an action. Strangely, 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 recomputate 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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