Table 1:

Some of the most important IgnisHPC API functions

Type	Functions
Map	map, flatmap, mapWithIndex, filter, keyBy, keys, values, mapPartitions, mapValues, etc.
Reduce	reduce, treeReduce, aggregate, treeAggregate, reduceByKey, aggregateByKey, etc.
Group	groupBy, groupByKey
Sort	sort, sortBy, sortByKey
I/O	parallelize,collect, top, take, saveAsObjectFile, saveAsTextFile, saveAsJsonFile, etc
SQL	union, join, distinct
Math	sample, sampleByKey, take, takeSample, count, countByKey, countByValue, max, min, etc.
Balancing	repartition, partitionByHash, partitionByRandom, partitionBy
Persistence	persist, cache, unpersist, uncache