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

-

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

Comments

Post a Comment

Popular posts from this blog

Hatching array of circles in AutoCAD using c# -

-
i beginner in autocad plugins .i have created array of circle using following code. now, have hatch circles in array .how that??how hatch circles @ once? moreover, how can return hatch method , use hatch objects.sorry language.thanks in advance. [assembly: commandclass(typeof(beamsection.class1))] namespace beamsection { public class class1 { //class1 obj = new class1(); [commandmethod("beamatsupport")] public void addlightweightpolyline() { // current document , database document acdoc = application.documentmanager.mdiactivedocument; database accurdb = acdoc.database; promptpointresult ppr = acdoc.editor.getpoint("\nselect starting point "); var ucs = acdoc.editor.currentusercoordinatesystem; point3d startingpt = ppr.value.transformby(ucs); list<double> radius = new list<double>(); radius.add(0.5); ...
Read more

ios - UITEXTFIELD InputView Uipicker not working in swift -

-
hello trying pop uipickerview view programmatically when user clicks on textfield. have tried doesn't doing anything. isn't working. nothing happening when click textfield class userprofiletableviewcontroller: uitableviewcontroller,uitextfielddelegate,uipickerviewdelegate,uipickerviewdatasource { var itempicker: uipickerview! = uipickerview() @iboutlet weak var gendertxtfield: uitextfield! var gender = ["male","female"] override func viewdidload() { super.viewdidload() gendertxtfield.delegate = self itempicker!.delegate = self itempicker!.datasource = self itempicker!.backgroundcolor = uicolor.blackcolor() self.gendertxtfield.inputview = itempicker } func numberofcomponentsinpickerview(pickerview: uipickerview) -> int{ return 1 } // returns # of rows in each component.. func pickerview(pickerview: uipickerview, numberofrowsincomponent component:...
Read more