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Transformation的官方文档方法集合如下：
map
filter
flatMap
mapPartitions
mapPartitionsWithIndex
sample
union
intersection
distinct
groupByKey
reduceByKey
aggregateByKey
sortByKey
join
cogroup
cartesian
pipe
coalesce
repartition
repartitionAndSortWithinPartitions
Action的官方文档方法集合如下：
reduce
collect
count
first
take
takeSample
takeOrdered
saveAsTextFile
saveAsSequenceFile
saveAsObjectFile
countByKey
foreach
Spark会产生shuffle的算子
去重
distinct
聚合
reduceByKey
groupBy
groupByKey
aggregateByKey
combineByKey
排序
sortByKey
sortBy
重分区
coalesce
repartition
集合或者表操作
intersection
subtract
subtractByKey
join
leftOuterJoin