Tang Yan created SPARK-7825:
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Summary: Poor performance in Cross Product due to no combine
operations for small files.
Key: SPARK-7825
URL: https://issues.apache.org/jira/browse/SPARK-7825
Project: Spark
Issue Type: Bug
Components: Spark Core
Affects Versions: 1.3.1, 1.3.0, 1.2.2, 1.2.1, 1.2.0
Reporter: Tang Yan
Dealing with Cross Product, if one table has many small files, spark sql has
to handle so many tasks which will lead to poor performance, while Hive has a
CombineHiveInputFormat which can combine small files to decrease the task
number.
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