Lianhui Wang created SPARK-5763:
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Summary: Sort-based Groupby and Join to resolve skewed data
Key: SPARK-5763
URL: https://issues.apache.org/jira/browse/SPARK-5763
Project: Spark
Issue Type: Improvement
Reporter: Lianhui Wang
In SPARK-4644, it provide a way to resolve skewed data. But when we has more
keys that are skewed, I think that the way in SPARK-4644 is inappropriate. So
we can use sort-merge to resolve skewed-groupby and skewed-join.because
SPARK-2926 implement merge-sort, we can implement sort-merge for skewed based
on SPARK-2926. And i have implemented sort-merge-groupby and it is very well
for skewed data in my test.Later i will implement sort-merge-join to resolve
skewed-join.
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