scala - Access key from mapValues or flatMapValues? -


in spark 1.3, there way access key mapvalues?

specifically, if have

val y = x.groupby(somekey) val z = y.mapvalues(somefun)

can somefun know key of y operating on?

or have do

val y = x.map(r => (somekey(r), r)).groupby(_._1) val z = y.mapvalues{ case (k, r) => somefun(r, k) }

note: reason want use mapvalues rather map preserve partitioning.

you can't use key mapvalues. can preserve partitioning mappartitions. 

val pairs: rdd[(int, int)] = ??? pairs.mappartitions({ =>   it.map { case (k, v) =>     // code   } }, preservespartitioning = true)

be careful preserve partitioning, compiler not able check it.


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