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Posted to issues@spark.apache.org by "Reynold Xin (JIRA)" <ji...@apache.org> on 2017/09/28 20:38:01 UTC

[jira] [Created] (SPARK-22160) Allow changing sample points per partition in range shuffle exchange

Reynold Xin created SPARK-22160:
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             Summary: Allow changing sample points per partition in range shuffle exchange
                 Key: SPARK-22160
                 URL: https://issues.apache.org/jira/browse/SPARK-22160
             Project: Spark
          Issue Type: New Feature
          Components: SQL
    Affects Versions: 2.2.0
            Reporter: Reynold Xin
            Assignee: Reynold Xin


Spark's RangePartitioner hard codes the number of sampling points per partition to be 20. This is sometimes too low. This ticket makes it configurable, via spark.sql.execution.rangeExchange.sampleSizePerPartition, and raises the default in Spark SQL to be 100.




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