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https://issues.apache.org/jira/browse/SPARK-4673?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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wangfei closed SPARK-4673.
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Resolution: Fixed
since coalesce (1) will lead to run with a single thread， not always speed up
limit so close this one.
> Optimizing limit using coalesce
> -------------------------------
>
> Key: SPARK-4673
> URL: https://issues.apache.org/jira/browse/SPARK-4673
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.1.0
> Reporter: wangfei
> Fix For: 1.3.0
>
>
> Now limit used ShuffledRDD and HashPartitioner to repartition 1 which leads
> to shuffle.
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