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https://issues.apache.org/jira/browse/SPARK-5763?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lianhui Wang updated SPARK-5763:
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Description:
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.
[~rxin] [~sandyr] [~andrewor14] how about your opinion about this?
was: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.
> 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.
> [~rxin] [~sandyr] [~andrewor14] how about your opinion about this?
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