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https://issues.apache.org/jira/browse/SPARK-16302?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15355662#comment-15355662
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Apache Spark commented on SPARK-16302:
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User 'lianhuiwang' has created a pull request for this issue:
https://github.com/apache/spark/pull/13979
> Set the right number of partitions for reading data from a local collection.
> ----------------------------------------------------------------------------
>
> Key: SPARK-16302
> URL: https://issues.apache.org/jira/browse/SPARK-16302
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Lianhui Wang
>
> query: val df = Seq[(Int, Int)]().toDF("key", "value").count it always use
> defaultParallelism tasks. So i cause run empty or small tasks.
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