Github user davies commented on the pull request:
https://github.com/apache/spark/pull/2478#issuecomment-56552452
RDD._jrdd is very heavy for PipelinedRDD, but getNumPartitions() could be
optimized for PipelinedRDD to avoid the creation of _jrdd (could be
rdd.prev.getNumPartitions()).
Also, partitions() is one Java Object, it should be an implementation
detail, it's better to keep it as internal interface.
len(rdd.partitions()) sounds more Pythonic, how about `len(rdd)`? cc
@JoshRosen
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