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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