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https://issues.apache.org/jira/browse/SPARK-15193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15274783#comment-15274783
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Nicholas Chammas commented on SPARK-15193:
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[~yhuai] - What do you think of this proposed change?
> samplingRatio should default to 1.0 across the board
> ----------------------------------------------------
>
> Key: SPARK-15193
> URL: https://issues.apache.org/jira/browse/SPARK-15193
> Project: Spark
> Issue Type: Improvement
> Components: PySpark, SQL
> Reporter: Nicholas Chammas
> Priority: Minor
>
> The default sampling ratio for {{jsonRDD}} is
> [1.0|http://spark.apache.org/docs/1.6.1/api/python/pyspark.sql.html#pyspark.sql.SQLContext.jsonRDD],
> whereas for {{createDataFrame}} it's
> [{{None}}|http://spark.apache.org/docs/1.6.1/api/python/pyspark.sql.html#pyspark.sql.SQLContext.createDataFrame].
> I think the default sampling ratio should be 1.0 across the board. Users
> should have to explicitly supply a lower sampling ratio if they know their
> dataset has a consistent structure. Otherwise, I think the "safer" thing to
> default to is to check all the data.
> Targeting this for 2.0 in case we consider it a breaking change that would be
> more difficult to get in later.
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