Github user felixcheung commented on the pull request:
https://github.com/apache/spark/pull/10123#issuecomment-161536076
This is actually not exported from SparkR - since it is first integrated in
Spark 1.4, SparkR is exporting a smaller/different set of API.
You can see in https://github.com/apache/spark/blob/master/R/pkg/NAMESPACE
While it is possible to access this with Spark:::numPartitions(), it has
been available since Spark 1.4 so this rename is actually going to be a
breaking change (of an internal API).
So I'd vote for no change in SparkR.
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