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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