wangjiaochun created SPARK-26287:
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Summary: Don't need to create an empty spill file when memory has
no records
Key: SPARK-26287
URL: https://issues.apache.org/jira/browse/SPARK-26287
Project: Spark
Issue Type: Improvement
Components: Spark Core
Affects Versions: 2.4.0
Reporter: wangjiaochun
In the function writeSortedFile of the class ShuffleExternalSorter
when If there are no records in memory, then we don't need to create an empty
spill file.
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