Github user a-roberts commented on the issue:
https://github.com/apache/spark/pull/15713
The benchmark used is HiBench 5 which works with Spark 1.6, I expect there
will be HiBench 6 officially available soon with [Spark 2
support](https://github.com/intel-hadoop/HiBench/pull/337)
We can see
[here](https://github.com/intel-hadoop/HiBench/blob/d076a43995fc59c3edc00b6d7ceecdb1572df406/workloads/pagerank/spark/scala/bin/run.sh)
that the Spark PageRank
[example](https://github.com/intel-hadoop/HiBench/blob/d076a43995fc59c3edc00b6d7ceecdb1572df406/src/sparkbench/src/main/scala/org/apache/spark/examples/SparkPageRank.scala)
is used and that the main functions, in order of their occurrence, are
textFile, map, split, slice, **groupByKey**, mapValues, join, flatMap,
reduceByKey
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