scala - Why doesn't keys() and values() work on (String,String) one-pair RDD, while sortByKey() works -

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i create rdd using readme.md file in spark directory. type of newrdd (string,string) 

val lines = sc.textfile("readme.md") val newrdd = lines.map(x => (x.split(" ")(0),x))

so, when try runnewrdd.values() or newrdd.keys(), error:

error: org.apache.spark.rdd.rdd[string] not take parameters newrdd.values()or.keys() resp.

what can understand error maybe string data type cannot key (and think wrong). if that's case, why newrdd.sortbykey() work ?

note: trying values() , keys() transformations because they're listed valid transformations one-pair rdds

edit: using apache spark version 1.5.2 in scala

it doesn't work values (or keys) receives no parameters , because of has called without parentheses:

val rdd = sc.parallelize(seq(("foo", "bar")))  rdd.keys.first // string = foo  rdd.values.first // string = bar

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